Class / Patent application number | Description | Number of patent applications / Date published |
162029000 | With regeneration, reclamation, reuse, recycling or destruction of digestion fluid | 63 |
20090025892 | Method to recover chemicals in mechanical pulping - The present invention refers to a method to recover chemicals in mechanical pulping by evaporating mechanical pulping or recycled fibre plant effluent and burning the received concentrate under oxidative atmosphere to yield sodium carbonate. According to the invention said sodium carbonate is dissolved into water together with CaO in order to convert said sodium carbonate into sodium hydroxide at least partly. | 01-29-2009 |
20090114352 | Process and system for calcination of high solids kraft paper pulp mill lime mud - The invention features methods and systems for calcining wet calcium carbonate lime mud produced in a re-causticizing manufacturing operation, for instance, Kraft pulp mill lime mud (“lime mud”) and converting it to re-burned lime by (a) feeding wet lime mud obtained from a re-causticizing manufacturing process into a flash dryer and then feeding the dried lime mud into a bubbling fluid bed calciner thermally linked by moving media heat transfer (MMHT) utilizing solid particulate media to a circulating fluid bed combustor wherein the MMHT provides heat input for calcination and drying; (b) recycling the media being from said calciner to said combustor wherein said combustor receives mill WWTP sludge, or precipitated lignins, or biomass, or NCGs as fuels to re-heat the solid particulate media; and (c) recovering calcined “soft-burned” lime mud from the fluid bed calciner. Steam and heated boiler feed-water are also generated and exported to the mill's steam distribution and generation system as well as hot process water for use in the mill's boiler house and manufacturing operation. The system for calcining calcium carbonate lime mud produced from a re-causticizing manufacturing operation and converting it to re-burned lime comprises a calciner and a combustor linked by a moving media heat transfer MMHT system or apparatus. The MMHT system or apparatus thermally links separate fluid bed combustion (exothermic) and calcination (endothermic) stages. The system further comprises a flash dryer or spray dryer that utilizes exhausted heat from the calcination stage. | 05-07-2009 |
20090114353 | Method of Papermaking - An inventive method of papermaking can be provided for creating an optimum wet end environment. In a preferred method, an aqueous solution of sodium hypochlorite acidified by hydrochloric acid to have a pH of greater than or equal to 4 and less than 7 and adjusted to have an effective chlorine concentration of 1,000 to 10,000 ppm, preferably 3,000 to 8,000 ppm is prepared and charged to a white water pit in a manner to be effective chlorine concentration therein to greater than or equal to 0.5 ppm. Before a step of papermaking, it is preferred that aqueous solution sodium hypochlorite having pH of greater than or equal to 4 and less than 7 is added continuously or intermittently to a raw material water with the expectation that at breaching a residual chlorine concentration becomes greater than or equal to 500 ppm. | 05-07-2009 |
20090126882 | Generation of active polysulphide - Polysulphide produced by oxidizing white liquor includes both active and inactive components. “Active” polysulphide is the only component that increases pulp yield. The amount of active polysulphide formed when manganese oxides are used as catalysts in the generating process is increased by adding a co-catalyst. Adding bismuth compounds and, in particular, bismuth oxide as a co-catalyst increases the total amount of polysulphide formed with all the manganese oxides and increases the amount of active polysulphide produced particularly when using the lower manganese oxides. The co-catalyst also increases the number of cycles in which the most active catalyst, manganese dioxide, can participate before losing efficiency. Other elements in the same group and adjacent groups in the periodic table are active but these other elements are more soluble than bismuth and are toxic. | 05-21-2009 |
20090266500 | PROCESS FOR PRODUCING TISSUE PAPER - The invention relates to a process for producing a tissue web, which is produced from a stock suspension including fibers. In this case, the volume and the tearing length are to be improved with the lowest possible freeness by the stock suspension containing lignocellolosic fibrous material made of wood or annual plants which has a tearing length of more than 6.5 km at 12°SR or a tearing length of more than 8.0 km at 15°SR and a lignin content of at least 15%, based on the oven-dry fibrous material, for coniferous wood in the unbleached state, or a tearing length of more than 4.5 km at 20°SR and a lignin content of at least 12%, based on the oven-dry fibrous material, for deciduous wood in the unbleached state, or a tearing length of more than 3.5 km at 20°SR and a lignin content of at least 10%, based on the oven-dry fibrous material, for annual plants in the unbleached state. | 10-29-2009 |
20100032111 | PROCESS FOR PRODUCING FIBROUS MATERIAL FROM WOOD - A process for producing fibrous material which includes the following: preparing a solution of chemicals that includes less than 25% of sulphite (calculated as Na | 02-11-2010 |
20100071862 | METHOD AND EQUIPMENT FOR THE EVAPORATION OF BLACK LIQUOR THAT IS OBTAINED FROM A DIGESTION PROCESS DURING THE PRODUCTION OF CELLULOSE PULP - The method and equipment are for the evaporation of hot black liquor obtained from a digestion process during the production of cellulose pulp. The black liquor is led to a multistage evaporation line with at least five evaporation stages. The black liquor that is to undergo evaporation in the evaporation line is cooled in at least one heat exchange process in a heat exchanger (HE | 03-25-2010 |
20100224334 | METHOD FOR TREATING LIQUID FLOWS AT A CHEMICAL PULP MILL - A method for treating liquid flows at a chemical pulp mill including at least an alkaline cooking process for producing pulp, treatment of brown stock generated in the cooking, a bleaching plant using ECF-bleaching, in which chloride-containing effluents are formed, an effluent purification plant for treating bleaching plant effluents and other effluents generated at the mill. At least a portion of the effluents is returned after the purification to the pulp production line as source of process water. More than one treatment line is arranged at the effluent purification plant for the mill effluents and effluents with different chemical compositions are purified in separate treatment lines so that the quality and amount of purified water from each treatment line is suitable for use in a stage or stages of the production process, whereto purified effluent is returned. | 09-09-2010 |
20100243183 | METHOD IN CONNECTION WITH THE WASHING OF PULP AT A CHEMICAL PULP MILL - A method in connection with washing of pulp at a chemical pulp mill including at least an alkaline cooking process utilizing cooking liquor for producing pulp, brown stock treatment with essentially closed liquid cycles, in which the last washing device is a washing device based on pressing of pulp, a press or a washing press, a pulp bleaching plant using ECF-bleaching, wherein chloride-containing effluents are formed, a chemical recovery plant and effluent purification. The liquid flows generated at a chemical pulp mill are efficiently circulated without disturbing the main process and minimizing the emissions from the mill. Purified effluent in the amount of at least 1 m3/adt pulp is introduced into the dilution after the press or washing press, whereby the effluent is passed from the dilution into the first process stage of the bleaching. | 09-30-2010 |
20100243184 | METHOD FOR TREATING LIQUID FLOWS AT A CHEMICAL PULP MILL - A method for treating liquid flows at a chemical pulp mill including at least an alkaline cooking process for producing pulp, brown stock treatment with essentially closed liquid cycles, a pulp bleaching plant using ECF-bleaching, a chemical recovery plant comprising a chemical recovery boiler, and effluent purification. Chloride-containing bleaching plant effluents are led to the effluent purification, where they are treated in order to decrease the organic matter content thereof. At least 20% of the purified effluent is returned to a pulp mill process and purified effluent is used in a last washing stage included in brown stock treatment. In the brown stock treatment the liquid flow is passed counter-currently to evaporation, wherefrom it is led for treatment to a recovery boiler process, wherein a separation process for chlorides is arranged for controlling the chloride level of the liquor cycle. | 09-30-2010 |
20110067829 | MAINTENANCE OF SULFUR CONCENTRATION IN KRAFT PULP PROCESSES - Methods and apparatus for maintaining sulfur concentration in the chemical recovery cycle of a Kraft pulping process. A portion of the recovery boiler ash is dissolved, treated to remove solids, and combined with an acid to provide a solution. The recovery boiler ash may be dissolved directly in the acid. The acid may be effluent from a chlorine dioxide generator. The resulting solution is maintained in a fully dissolved state and subjected to an acid separation step to provide a sodium sulfate enriched phase, which may be used to maintain sulfur concentration in the Kraft pulping process, and a sulfuric acid phase. Chlorine ions can be separated with the sulfuric acid phase. The sulfuric acid phase can be recycled to the chlorine dioxide generator. | 03-24-2011 |
20110079364 | Process for Controlling Ammonia Loss - A method of offsetting losses of ammonia from a pulping mill comprising cooking a lignocellulosic material in a cooking liquor, wherein cooking in the cooking liquor separates the lignocellulosic material into a pulp, capturing a vapor of the cooking liquor, condensing the vapor of the cooking liquor to yield a spent cooking liquor condensate, washing the pulp in a wash liquid, wherein washing the pulp removes at least a portion of the spent cooking liquor from the pulp, capturing the wash liquid, removing ammonia from the wash liquid to yield a regenerated ammonia, regenerating the cooking liquor from the spent cooking liquor condensate and the regenerated ammonia, combusting a waste material and a concentrated spent cooking liquor, wherein combusting the waste material and the concentrated spent cooking liquor yields a flue gas and heat, transferring the heat from combusting the waste material and the concentrated spent cooking liquor to water to generate steam, removing a sulfur-containing compound from the flue gas, and introducing an effluent stream into an effluent treatment system, wherein introduction of the effluent stream into the effluent system will remove ammonia from the effluent stream. | 04-07-2011 |
20110094692 | METHODS OF PRETREATING COMMINUTED CELLULOSIC MATERIAL WITH CARBONATE-CONTAINING SOLUTIONS - Methods of pretreating comminuted cellulosic material with an acidic solution and then a carbonate-containing solution to produce a pretreated cellulosic material are provided. The pretreated material may then be further treated in a pulping process, for example, a soda-anthraquinone pulping process, to produce a cellulose pulp. The pretreatment solutions may be extracted from the pretreated cellulose material and selectively re-used, for example, with acid or alkali addition, for the pretreatment solutions. The resulting cellulose pulp is characterized by having reduced lignin content and increased yield compared to prior art treatment processes. | 04-28-2011 |
20110108222 | EFFECT OF LOW DOSE XYLANASE ON PULP IN PREBLEACH TREATMENT PROCESS - A prebleach treatment of pulp with xylanase enzyme prior to chemical bleaching is disclosed. A process of making pulp comprises treating a pulp with xylanase in an amount of less than 50 g of xylanase per ton of pulp. The treating step is carried while buffering the pulp and xylanase with a buffering agent to a pH of from about 6.5 to about 7.5 prior to at least one bleaching stage to form a treated pulp. | 05-12-2011 |
20110120662 | METHOD AND EQUIPMENT FOR TREATMENT OF BLACK LIQUOR AT PULP MILL - The invention relates to a method and equipment for treatment of black liquor at a pulp mill in order to recover chemicals and energy contained therein. In the invention, the black liquor is pyrolyzed in a pyrolysis reactor ( | 05-26-2011 |
20110192559 | METHODS FOR PRETREATING BIOMASS - A method of alkaline pretreatment of biomass, in particular, pretreating biomass with gaseous ammonia. | 08-11-2011 |
20110192560 | PROCESS OF PRODUCING XYLOSE AND DISSOLVING PULP - The present invention relates to a process for the production of xylose and dissolving pulp from xylan-containing biomass, such as hardwood. The invention is based on prehydrolysis of the xylan-containing biomass with SO | 08-11-2011 |
20110226427 | Method of Recovering Aqueous N-methylmorpholine-N-Oxide Solution Used in Production of Lyocell Fiber - A method of recovering an aqueous N-methylmorpholine-N-oxide (NMMO) solution used in production of Lyocell fiber includes: decoloring the aqueous NMMO solution by mixing the same with activated carbon using an agitation blower and by alternately energizing and de-energizing the agitation blower to contact the activated carbon with the aqueous NMMO solution thoroughly in an energy-efficient manner; filtering the aqueous NMMO solution which has been decolored through coarse filtration followed by ultrafiltration to remove the activated carbon and impurities from the aqueous NMMO solution; and concentrating the aqueous NMMO solution which has been filtered using one of a mechanical vapor recompression evaporator and a triple effect evaporator to remove water from the aqueous NMMO solution. | 09-22-2011 |
20110247771 | METHOD AND APPARATUS FOR PROCESSING BLACK LIQUOR OF PULP MILL - The invention relates to a method and apparatus for processing the black liquor of a pulp mill to recover the chemicals and energy therein. In the invention, the black liquor is pyrolyzed in a pyrolysis reactor ( | 10-13-2011 |
20120073772 | GASIFICATION OF SULPHITE THICK LIQUOR - Method for recovering chemicals and energy from sulphite thick liquor containing organic and inorganic compounds obtained when producing pulp by chemical delignification of fibrous raw material using a sulphite pulping process, the method including processing of the organic and inorganic compounds at a global temperature above 800° C. whereby producing partly at least one phase of a liquid material and partly at least one phase of a gaseous material. The processing is carried out by gasification of the sulphite thick liquor in a gasification reactor at sub-stoichiometric conditions and in the presence of an oxidizing medium. The reactor has an opening in its bottom in the form of a chute which opens directly into a quench compartment. | 03-29-2012 |
20130206346 | FLASH TANK WITH ADJUSTABLE INLET AND METHOD FOR ADJUSTING INLET FLOW TO A FLASH TANK - A flash tank including: a closed interior chamber; a gas exhaust port coupled to an upper portion of the chamber; a liquid discharge port coupled to a lower portion of the chamber; an inlet nozzle attached to an inlet port of the chamber, wherein the inlet nozzle includes a flow passage, and a movable valve plate in the flow passage, wherein the valve plate has a first position which defines a first throat in the flow passage and a second position which defines a second throat having a smaller cross-sectional area than the first throat. | 08-15-2013 |
20130340960 | METHOD AND ARRANGEMENT FOR SEPARATING CONTAMINANTS FROM LIQUIDS OR VAPORS - A method and assembly for separating contaminants from liquids, such as condensates, or vapors at an evaporation plant. The contaminants are separated from liquids by stripping when bringing a contaminant-enriched liquid into direct contact with a vapor by spraying or distributing the liquid into the vapor flowing in a vapor duct or onto wall surfaces in the vapor duct thus reducing the contaminant-content of the sprayed liquid and producing a cleaner liquid. The contaminants are enriched in the vapor. From vapors contaminants are separated by absorption when bringing a contaminant-enriched vapor into direct contact with a cleaner liquid by spraying or distributing the liquid into the vapor flowing in a vapor duct or onto wall surfaces in the vapor duct thus increasing the contaminant-content of the liquid, but producing a cleaned vapor. | 12-26-2013 |
20140034253 | PROCESS FOR ACETIC ACID REMOVAL FROM PRETREATED BIOMASS - The process for treating a ligno-cellulosic biomass feed stream comprised of solids, C5's, C6's, lignin, and water comprises the steps of:
| 02-06-2014 |
20140352900 | FLASH TANK WITH FLARED INLET INSERT AND METHOD FOR INTRODUCING FLOW INTO A FLASH TANK - A flash tank including: an interior chamber having a interior surface formed by a sidewall of the flash tank; a vapor exhaust port coupled to an upper portion of the chamber; a liquid discharge port coupled to a lower portion of the chamber; an insert inlet tube having an insert outlet and inserted into an inlet port of the chamber, wherein the insert inlet tube extends inward of the sidewall and the insert outlet has an elongated cross-sectional shape oriented substantially parallel to a center vertical axis of the flash tank and substantially perpendicular to a radial line of the flash tank, such that the insert outlet is substantially tangential to the sidewall. | 12-04-2014 |
162300100 | With destruction of organic ingredient in or smelting of liquor | 8 |
20080289782 | RECOVERY PROCESS AND SYSTEM FOR A PULP MILL - A method for burning chlorine-containing liquors in a chemical recovery boiler at a pulp mill, wherein the recovery boiler includes spent liquor sprayers for feeding spent liquor and a number of combustion air levels including: increasing a combustion temperature in the recovery boiler in a burning zone where a chlorine-containing liquor or a chlorine-containing effluent is burned; while burning the liquor or effluent, volatilizing the chlorine in the liquor or effluent to produce chloride-containing salts in flue gases in the boiler, and removing the chloride-containing salts from the flue gases. | 11-27-2008 |
162300110 | Treatment of kraft pulping chemicals | 6 |
20090126883 | Use of polysulfide in modified cooking - A method for Kraft pulping employing a modified cooking process in conjunction with polysulfide pulping technologies to obtain higher pulping yields than obtained in the prior art. The total required alkali charge (polysulfide liquor) is added to the beginning of a cook, and after all polysulfide has essentially reacted with lignocellulosic material at temperature below that at which no significant carbohydrate degradation occurs, a first quantity of the cooking liquor high in effective alkali (EA) concentration is removed from a first point in the pulping process and replaced with a cooking liquor low in EA concentration removed from another process point. The first quantity is then added elsewhere in the pulping process, where the EA concentration is low. This cooking liquor “exchange” obtains the full yield benefit from polysulfide pulping and a more uniform EA concentration profile to retain the major benefits of modified cooking. | 05-21-2009 |
20090288790 | Process and apparatus for treating green liquor - A method of and apparatus for treating a green liquor stream produced in a kraft pulp process to separate green liquor from dregs present in the stream by utilizing a filtration vessel that has a pressure differential between the green liquor inlet and outlet to drive the dregs from the green liquor. In addition, negative pressure is utilized in the filtration vessel to thereby drive water vapor from and consequently cool the filtered green liquor. | 11-26-2009 |
20100108274 | DISPOSAL PROCESS FOR SULFIDE-FREE BLACK LIQUORS - Lignin is flocculated and batched off from a sulfide-free black liquor discharged out of a pulp digestion step by water disposal techniques, and organic matters remaining in the filtrate are removed to recover water, acids and caustic soda. | 05-06-2010 |
20140027076 | CRP Purge Treatment - In a digester, wood chips and white liquor are combined and cooked under pressure to pulp the wood. This produces black liquor which is concentrated and burned in a recovery boiler. The recovery boiler produces ash that contains sodium, sulphur, potassium and chloride. The ash is dissolved and subjected to a process that recovers sodium sulfate and burkeite. The concentration of potassium and chloride is reduced, in part at least, by subjecting the ash to adiabatic cooling in a crystallizer which produces glaserite and a purge stream rich in chloride. By leaching the glaserite, sodium sulfate is removed from the glaserite, leaving potassium sulfate. The recovered sodium sulfate and burkeite can be recycled and used as pulping chemicals. The removed potassium and chloride can be further treated or appropriately discarded. | 01-30-2014 |
20140374039 | METHOD FOR THE CAUSTICIZING PROCESS FOR PRODUCING WHITE LIQUOR - The method is for preparation of white liquor in a chemical recovery process of the kraft process. The green liquor separation process and the white liquor separation process are taking place in the same common filter apparatus with no dedicated green liquor separation apparatus or any dedicated white liquor separation apparatus. The white liquor separation process and the green liquor separation process are conducted in sequence in the same filter apparatus. The white liquor separation process has a part of the cycle time in the range 20-50% of the total cycle time in the same filter apparatus. | 12-25-2014 |
20160002852 | PROCESS FOR RECAUSTICIZING GREEN LIQUOR - A process for recausticizing green liquor in a sulphate or Kraft process for wood pulp production, in which a green liquor consisting of an aqueous solution of sodium carbonate as the major component and sodium sulphide is admixed with calcium oxide in a slaker and undergoes a reaction in a recausticizer to form an aqueous suspension containing sodium hydroxide and calcium carbonate as the major components, which suspension is filtered on a first filter and subsequently, after dilution with water in a dilution vessel, is fed over further filters two or three times and filtered to separate solids suspended therein, characterized in that after a first separation of calcium carbonate as the major component and calcium oxide as the minor component, carbon dioxide is added to the aqueous suspension at least during dilution in a dilution vessel and in particular in the dilution vessel (s) upstream of a second and/or a third filter. | 01-07-2016 |
162034000 | Plural diverse digestion of same fibrous material | 1 |
20090000751 | Bleaching process with at least one extraction stage - An improved pulp bleaching process having at least one Do delignification stage followed by at least one extraction stage is selected from the group consisting of Eo, Eop, Ep, and E extraction stage. The process comprises treating the delignified pulp Do pulp from the Do stage in a M | 01-01-2009 |
162037000 | Digestion fluid reused on different fibrous materials | 20 |
20110108223 | Method For Vapor Phase Pulping With Alcohol and Sulfur Dioxide - A method for the fractionation of lignocellulosic materials into cellulose, hemicelluloses and lignin in a batch or continuous process in a treatment with vaporous mixture of aliphatic alcohol, sulfur dioxide and water. Cooking conditions are varied to get different proportions of cellulose, hemicelluloses and lignin. Chemical recovery through pressure release is described. | 05-12-2011 |
20110226428 | Methods for beating pulp, methods for treating process waters, and methods for producing pulp and paper - The first invention aims to provide a method for preparing stiffer bulky pulp at a freeness level comparable to that obtained by mechanical treatments to improve the bulkiness of product paper by searching for a method capable of adjusting freeness while suppressing damage to pulp fibers and internal fibrillation in a process for producing pulp. The second invention aims to strip contaminants deposited on pulp fibers and/or inorganic particles to reduce adhesion of the contaminants and decrease microorganisms in a treatment of process water containing long pulp fiber fractions used in a process for producing pulp and paper, thereby clarifying process water and thus preparing high-quality pulp and paper. | 09-22-2011 |
20120168102 | PULPING PROCESS FOR QUALITY PROTECTION INCLUDING METHODS FOR HEMICELLULOSE EXTRACTION AND TREATMENT OF HEMICELLULOSE-EXTRACTED LIGNOCELLULOSIC MATERIALS - A method for producing pulp by extracting hemicellulosic materials from lignocellulosic materials using water in an extraction stage, wherein the extraction stage is either a single extraction or a double extraction process; treating the lignocellulosic materials with an oxidizing agent in a treatment stage, wherein the treatment stage is selected from the group consisting of a second extraction process, an agent impregnation process, and a first pretreatment process; treating the lignocellulosic materials with a reducing agent in the treatment stage, wherein the treatment stage is selected from the group consisting of the second extraction process, the agent impregnation process, and a second pretreatment process; and then subjecting the lignocellulosic materials to a modified Kraft pulping process to produce pulp. | 07-05-2012 |
20120211183 | METHOD AND APPARATUS TO PRODUCE PULP USING PRE-HYDROLYSIS AND KRAFT COOKING - A pulp cooking system including: a cellulosic material feed system, a pre-hydrolysis reactor vessel and a Kraft cooking reactor vessel. The feed material system includes a steaming chip bin and a high pressure transfer device. The pre-hydrolysis reactor vessel maintains the feed material in a mildly acidic condition and allows hydrolysate to be extracted through screens below a hydrolysis zone in the vessel. A wash zone is below the screens and allows wash liquid to flow through the feed material in a cross-current direction. The wash liquid and hydrolysate removed from the feed material is extracted through the screens. The feed material is maintained in a mildly acidic condition through the pre-hydrolysis reactor vessel until the material enters the Kraft cooking vessel where the feed material is treated with alkaline cooking liquors. | 08-23-2012 |
20120211184 | FRACTIONATION OF A WASTE LIQUOR STREAM FROM NANOCRYSTALLINE CELLULOSE PRODUCTION - During nanocrystalline cellulose (NCC) production, a considerable amount of sulphuric acid is used. After the separation of the NCC, the remaining solution contains sugars and residual sulphuric acid. The sugars are in the monomeric and oligomeric forms. To reduce the cost of NCC production and to produce other added-value products, the spent acid stream can be fractionated into sugar oligomers, sugar monomers, and acid. The acid can be recycled to the NCC manufacturing process after concentration. The sugar monomers and sugar oligomers can be used for the manufacturing of other valuable chemicals. Membrane nanofiltration can be used to achieve this objective. A polymeric membrane with a molecular weight cut-off in the range of 200 Dalton was employed. Using this approach, the majority of the acid was recovered in the permeate while the sugars were concentrated in a smaller stream. The sugar level in the separated acid/permeate stream was only about 3% of the original concentration. A second membrane filtration stage can be used to separate the monomeric from the oligomeric sugars. The two sugar streams can be employed in different applications to produce value-added products. | 08-23-2012 |
20120305207 | METHOD FOR VAPOR PHASE PULPING WITH ALCOHOL AND SULFUR DIOXIDE - A method for the fractionation of lignocellulosic materials into cellulose, hemicelluloses and lignin in a batch or continuous process in a treatment with vaporous mixture of aliphatic alcohol, sulfur dioxide and water. Cooking conditions are varied to get different proportions of cellulose, hemicelluloses and lignin. Chemical recovery through pressure release is described. | 12-06-2012 |
20140102648 | METHOD AND ARRANGEMENT FOR TREATING CHEMICAL PULP - A method to pulp cellulosic fibrous material including: alkaline cooking cellulosic fibrous material in a continuous digester vessel to produce a pulp having a kappa number in a range of 50 to 120; washing the pulp discharged from the digester vessel; treating the washed pulp in the presence of oxygen and alkali to remove lignin; washing the oxygen-treated pulp such that the kappa number is recued by at least at least 30; separating lignin from wash filtrate generated by the washing of the oxygen-treated pulp, and using the separated wash filtrate as a washing liquid in the washing of the pulp from the digester vessel. | 04-17-2014 |
162038000 | With addition of chemicals prior to reuse | 4 |
20090056889 | Detoxifying and Recylcing of Washing Solution Used In Pretreatment Of Lignocellulose-Containing Materials - The invention relates to a process of detoxifying pretreated lignocellulose-containing material comprising washing the pretreated lignocellulose-containing material in a washing solution and treating the used washing solution to remove an enzyme inhibitor and/or an inhibitor of a fermenting organism before recycling the used washing solution. | 03-05-2009 |
20110272108 | PROCESS FOR PRODUCING PULP AND AT LEAST ONE ORGANIC LIQUID OR LIQUEFIABLE MATERIAL OF VALUE WITH OFFGAS RECYCLING - The present invention relates to an integrated process for producing pulp and at least one organic liquid or liquefiable material of value, wherein
| 11-10-2011 |
20120132379 | METHOD FOR OBTAINING CELLULOSE FROM BIOMASS COMPRISING LIGNOCELLULOSE - The invention relates to a method for obtaining cellulose by separating lignin from a biomass comprising lignocellulose in the form of plants or plant parts, wherein the biomass comprising lignocellulose is solubilized in a boiler in an alkaline medium comprising alkanol amine, and dissolved lignin is separated from the resulting raw cellulose. Said method is characterized in that the biomass comprising lignocellulose is not from a wood source, and is solubilized at a temperature of less than approximately 170° C. in a solubilizing agent based on alkanol amine and water, wherein the weight ratio of alkanol amine to water is set to 80:20 to 20:80, and raw cellulose thus produced is separated from the waste lye using a typical method. Said method is particularly advantageous for obtaining cellulose from annual plants, particularly wheat straw. The method is advantageously improved in that the solubilization takes place in the presence of a catalyst, particularly of anthrachinon. An advantageous bleaching process may be performed subsequently. Said method is characterized by great economic efficiency, particularly due to the high reclamation rates of the alkanol amine used, and leads to lower environmental impact in wastewater, and to reduced disposal costs. The design of the method leads to a greater yield of cellulose and largely prevents degradation of alkanol amine, particularly monoethanol amine (MEA). | 05-31-2012 |
162039000 | In digester | 1 |
20110240237 | Compositions and Processes to Increase Pulp Yield, Reduce Extractives, and Reduce Scaling in a Chemical Pulping Process - In general, the present disclosure is directed to compositions and processes to increase pulp yield, reduce extractives, and reduce scaling in a chemical pulping process. In one particular embodiment, for instance, the present disclosure is directed to a composition comprising a surface active agent, an alkaline mixture, at least one polymer, the polymer having a linear backbone segment having two ends, at least one phosphorus component, the phosphorus component chemically linked along the linear backbone segment of the polymer, and at least one end component, the end component chemically linked to one or both ends of the linear backbone segment of the polymer. | 10-06-2011 |
162040000 | Without treatment or modification | 9 |
20090020245 | SECURITY PAPER OR SPECIAL PAPER INCORPORATING HIGH RESISTANCE SYNTHETIC ELEMENTS AND A PROCEDURE FOR OBTAINING SAID PAPERS - It consists in performing a security paper or special paper incorporating pigments within the paste of the synthetic element itself during its manufacture, providing pigment properties to said synthetic element, the pigments being protected from the attack of physical and chemical agents by the synthetic element itself. | 01-22-2009 |
20110232853 | BCTMP Filtrate Recycling System and Method - A process for making bleached pulp comprises contacting an unbleached pulp mixture with a first recycled filtrate obtained from a first location ( | 09-29-2011 |
20120097350 | ALKALINE PEROXIDE TREATMENT OF REJECTS IN AN INTERGRATED NEUTRAL-ALKALINE PAPER MILL - A processes producing mechanical pulps utilizing refiners for improving the quality of screen rejects, and most particularly to a mechanical pulp mill integrated with a neutral-alkaline papermaking process producing mechanical printing paper grades is disclosed. The rejects are treated with hydrogen peroxide, an alkali and an organic stabilizing agent just prior to or during refining to provide improved optical and physical properties of the refined rejects and more efficiently utilize electrical energy to reach target fiber quality after bleaching for cost-effectively producing a wide array of coated and uncoated mechanical printing papers. | 04-26-2012 |
20120305208 | Process for Recovering Molybdate or Tungstate from Aqueous Solutions - Process for recovering molybdate or tungstate from an aqueous solution, in which molybdate or tungstate is bound to a water-insoluble, cationized inorganic carrier material from the aqueous solution at a pH in the range from 2 to 6, the laden carrier material is separated off and the bound molybdate or tungstate is liberated once again into aqueous solution at a pH in the range from 6 to 14. The process is suitable for recovering molybdate or tungstate in the delignification of pulp with hydrogen peroxide in the presence of molybdate or tungstate as catalyst. The recovered molybdate or tungstate can be recycled to the delignification. | 12-06-2012 |
20130299104 | Screen Basket Optimized For Removal Of Stickies From Adhesives-Contaminated Recyclable Fiber - A screen structure which is unusually effective at removing stickies from recyclable fiber but is tolerant of substantial swings in throughput which result in variations in the flow velocity through the screen—slot velocity. One example of the screen structure is created by forming a very large number of similarly shaped vanes then locking them into a ring structure to form a cylindrical screen basket but equivalent surface configurations can also be formed into sheet stock. | 11-14-2013 |
20140166221 | RECYCLABLE BUFFER FOR THE HYDROTHERMAL HYDROCATALYTIC TREATMENT OF BIOMASS - A method of hydrothermal hydrocatalytic treating biomass is provided. Lignocellulosic biomass solids is provided to a hydrothermal digestion unit in the presence of a digestive solvent, at least one of ammonia or a source of ammonia, and a supported hydrogenolysis catalyst containing (a) sulfur, (b) Mo or W, and (c) Co, Ni or mixture thereof, incorporated into a suitable support. The lignocellulosic biomass solids and digestive solvent are heated in the presence of hydrogen, supported hydrogenolysis catalyst and the at least one of ammonia or a source of ammonia forming a product solution containing plurality of oxygenated hydrocarbons and ammonia. At least a portion of ammonia is separated and recycled to the hydrothermal digestion unit. | 06-19-2014 |
20140174679 | BCTMP Filtrate Recycling System and Method - A process for making bleached pulp comprises contacting an unbleached pulp mixture with a first recycled filtrate obtained from a first location ( | 06-26-2014 |
20140246158 | TWO VESSEL REACTOR SYSTEM AND METHOD FOR HYDROLYSIS AND DIGESTION OF WOOD CHIPS WITH CHEMICAL ENHANCED WASH METHOD - A reactor vessel system including: a first reactor vessel having a hydrolysate and liquid extraction screen, a first region above the extraction screen that is maintained at conditions promoting a hydrolysis reaction in the cellulosic material, a second region below the extraction screen in which the hydrolysis is substantially suppressed and a wash liquid inlet below the extraction screen providing wash liquid at a temperature below a hydrolysis temperature; a transport pipe having an inlet coupled to the first reactor vessel and an outlet coupled to a second reactor vessel, and the second reactor vessel includes a liquid discharge that extracts a portion of liquid from the second reactor vessel and directs the portion of liquid to the first reactor vessel or to the transport pipe. | 09-04-2014 |
20150315746 | METHODS OF PROCESSING PLANT FIBER, AND RELATED SYSTEMS AND COMPOSITIONS - The present invention relates to plant fiber processes (e.g., washing, drying, and/or grinding) that utilize recycle and/or make-up streams to use water resources efficiently and/or produce intermediate and/or final products with desired properties. | 11-05-2015 |
162041000 | Recirculation (includes separation from fibers) | 11 |
20110100572 | METHOD FOR KRAFT PULP PRODUCTION WHERE HEMICULLULOSES ARE RETURNED - The method increases the yield and improves the beatability of kraft pulp. During the progression of the cooking process, more than one cooking liquor with a dissolved content of hemicellulose is drawn off and then reintroduced to the last phases of the cooking process, to re-precipitate the hemicellulose on the fibers. The hemicellulose rich cooking liquors are adjusted so that they, upon being added to the last phase of the cooking process are optimized. Early dissolved hemicellulose has a longer chain length than the hemicellulose that dissolves in the cooking liquor in the later phases of the cooking process, and they also have different tendencies to precipitate on the wood chips softened in the cooking process. | 05-05-2011 |
20120279669 | METHOD OF TREATING LIQUID FLOWS AT A CHEMICAL PULP MILL - A method of treating and utilizing liquid flows at a chemical pulp mill including stages for: a) chemical pulp is produced in an alkaline cooking process, b) the brown stock generated in the cooking is treated, said treatment comprising washing of the stock and preferably oxygen delignification and subsequent washing of the stock, c) a bleaching process for the brown stock, the bleaching sequence comprising at least one stage using chlorine dioxide and additionally at least one oxidizing bleaching stage and having at least two washing stages for treating the stock with liquids and for producing filtrates, and d) filtrates from stage c) are purified at an effluent treatment plant of the chemical pulp mill, which comprises at least biological treatment, for obtaining purified effluent. The method further includes a stage e), where the purified effluent with a color of 200 mg/l (Pt color) or more and a COD value of over 150 mg/l is used as pulp treatment liquid in stage c). | 11-08-2012 |
20120325417 | METHOD OF PRODUCING CELLULOSE PULP - A method of defibring lignocellulose-bearing raw material with a polysulphide-bearing cooking liquor in a continuous digester. According to the present invention, cooking liquor is mixed into the raw material which is to be defibred before the cooking, and the cooking liquor is allowed to absorb into the raw material at a temperature which is at maximum approximately 130° C. After that, cooking liquor used for the absorption is separated from the raw material which is treated in this way, the separated cooking liquor is heated to a temperature of approximately 140-170° C., after which the generated hot cooking liquor is mixed back into the treated raw material, possibly together with a fresh feed of cooking liquor fresh feed, and the raw material is defibred by means of the hot cooking liquor in a continuous digester in order to generate pulp which has a desired kappa number. Thus, in the cooking stage, alkaline cooking liquor which was originally dosed into the absorption process, and only the temperature of which was increased, is used; liquor to be absorbed is not removed, nor is any fresh liquor fed into the cooking, or if it is, only small amounts of it. | 12-27-2012 |
20140284007 | TREATMENT, SUCH AS CUTTING, SOAKING AND/OR WASHING, OF ORGANIC MATERIAL - The invention relates to a method or methods of operating an apparatus for treating material by cutting, soaking and/or washing of the material, wherein the apparatus comprises a receptacle, a discharge element with a vortex generator and a pump arranged to pump fluid and material from the receptacle towards the vortex generator, wherein the vortex generator and the pump in combination are adapted to generate a vortex in the form of a conic helix in the fluid extending into the receptacle. | 09-25-2014 |
20150136346 | PROCESS AND A DISSOLVING PULP MANUFACTURED BY THE PROCESS - The invention relates to processes for manufacturing pulp and more specifically to improved processes for manufacturing dissolving pulp. The processes have primarily been developed to be used in connection with large scale kraft processes, i.e. they have been designed to be incorporated into a plant. A liquor derivable from the process and comprising xylan, lignin, alkali and water is also disclosed as well as a dissolving pulp produced by the process. | 05-21-2015 |
20160130753 | METHOD FOR RECOVERING HYDROLYSATE - The method is for producing pulp. More particularly, a displacement batch cooking process comprises recovery of a first treatment liquid by draining of the digester, preferably not using a displacement liquid. The method may preferably be used in a prehydrolysis step, wherein the recovery of the by-products is improved. In the recovery step, after the target P-factor in the prehydrolysis stage is reached, the hydrolysate is withdrawn by draining in at least one phase obtaining a strong first liquid and thereafter any residual hydrolysate may be displaced. | 05-12-2016 |
20160138200 | ALKALI RECYCLE IN CELLULOSE SPINNING PROCESS - The present invention concerns a method for the recovery of solvent in a process for preparation of regenerated cellulosic fibers using sodium hydroxide as solvent for cellulose dissolving in the manufacturing of a cellulose spinning dope wherein sodium hydroxide present in the spinning dope is at least partially recovered and recycled as sodium hydroxide from a cellulose fiber regeneration or cellulose coagulation step and wherein said cellulose fiber regeneration or cellulose coagulation step consists of a bath into which cellulose spinning dope is injected. Recovered sodium hydroxide may be directly or indirectly recycled from a cellulose fiber regeneration or cellulose coagulation step to a cellulose dissolving step. | 05-19-2016 |
162042000 | With treatment of fluids during recirculation | 4 |
20080314534 | METHOD AND SYSTEM FOR DIRECT CONTACT OF HOT LIQUOR WITH WOOD CHIPS IN TRANSFER CIRCULATION - A method for heating a chip slurry in a pulping system including an impregnation vessel and a chemical digesting vessel, the method including: impregnating chips in the impregnation vessel with a liquor; transporting the chips from the impregnation vessel to an upper elevation of the digester vessel; extracting liquor from a lower elevation of the digester vessel, wherein the extracted liquor has a temperature substantially higher than a temperature of the chips being transported to the upper elevation of the digester vessel, and adding extracted liquor from the lower elevation of the digester vessel to the chips being transported from the impregnation vessel to the digester vessel. | 12-25-2008 |
20160145797 | CONTINUOUS DIGESTER AND FEEDING SYSTEM - One embodiment provides an apparatus for cooking lignocellulosic material, comprising a pressurizable, inclined top separator including a sluicing liquor inlet for receiving a sluicing mixture comprising impregnated lignocellulosic material and sluicing liquor, a hot black liquor inlet, an excess liquor outlet, and an impregnated lignocellulosic material outlet; a continuous digester vessel including an impregnated lignocellulosic material inlet in communication with the impregnated lignocellulosic material outlet, and a warm black liquor outlet; and a black liquor circulation and heating loop including a warm black liquor inlet in communication with said warm black liquor outlet, a heater for heating warm black liquor to produce hot black liquor, and a hot black liquor outlet in communication with said hot black liquor inlet. Methods of making and using the apparatus are also provided. | 05-26-2016 |
162045000 | With addition of chemicals to recirculating fluid | 2 |
20110203755 | METHOD FOR PREVENTING CLOGGING IN A STRAINER CONSTRUCTION FOR A CONTINUOUS DIGESTER - The method is for influencing the flow from a strainer construction in a continuous digester. In order to avoid clogging of the withdrawal compartment in the strainer construction, an additive that counteracts precipitation processes is added directly to the withdrawal compartment while the cooking fluid is withdrawn from the withdrawal compartment. The addition of chemicals can take place at the same time as the withdrawn cooking fluid is withdrawn from the digester and the strainer construction, or while the withdrawn cooking fluid is fully or partially re-circulated back to the withdrawal compartment. | 08-25-2011 |
20150007951 | METHOD FOR RECOVERY OF MOLYBDATE IN A MOLYBDATE-CATALYSED DELIGNIFICATION OF PULP WITH HYDROGEN PEROXIDE - In a delignification of pulp with hydrogen peroxide catalyzed by molybdate, molybdate can be recovered by contacting the molybdate-containing aqueous solution at a pH in the range from 2 to 7 with a carrier material comprising a sheet silicate been ion-exchanged with a quaternary ammonium salt and subsequent flotation without a surfactant having to be added for flotation. | 01-08-2015 |