Class / Patent application number | Description | Number of patent applications / Date published |
423481000 | Hydrogen halide | 37 |
20080311026 | Process for the Production of Hydrogen by the Thermochemical Route, Based on the Hydrochlorination of Cerium - Process for the production of hydrogen by the thermochemical route from water, based on the chlorine/cerium cycle, in which, according to a first reaction scheme, the following reactions are carried out: | 12-18-2008 |
20100111818 | REMOVAL OF CONTAMINANTS FROM BY-PRODUCT HYDROCHLORIC ACID - The present disclosure is drawn to a method for removing colloidal titanium dioxide and titanium oxychloride from by-product hydrochloric acid, typically without the use of metallic hydroxides and/or other neutralizing agents. Often, the decontaminated hydrochloric acid product is commercial grade and has concentrations greater than 85 wt % of the concentration of untreated by-product hydrochloric acid. The method includes adding phosphate ion source and quaternary amine or other precipitating agent to the by-product hydrochloric acid to cause the titanium dioxide and the titanium oxychloride to form a precipitate. In one embodiment, the method further includes heating at least one of the phosphate ion source, the quaternary amine or alternative precipitating agent, the by-product hydrochloric acid, or combination thereof. The precipitate can then be separated from the acid, thus producing a decontaminated hydrochloric acid product with reduced levels of titanium and other contaminants. | 05-06-2010 |
20100158789 | REMOVAL OF CONTAMINANTS FROM BY-PRODUCT ACIDS - The present invention is drawn to a method for removing colloidal titanium dioxide and titanium oxychloride from by-product hydrochloric acid. The method includes adding phosphate ion source and quaternary amine to the by-product acid to cause the titanium dioxide and the titanium oxychloride to form a precipitate. The precipitate can then be separated from the acid, thus producing a decontaminated hydrochloric acid product with reduced levels of titanium. | 06-24-2010 |
20110044882 | METHOD OF MAKING HIGH PURITY LITHIUM HYDROXIDE AND HYDROCHLORIC ACID - The present invention relates to a process for producing high purity lithium hydroxide monohydrate, comprising following steps: concentrating a lithium containing brine; purifying the brine to remove or to reduce the concentrations of ions other than lithium; adjusting the pH of the brine to about 10.5 to 11 to further remove cations other than lithium, if necessary; neutralizing the brine with acid; purifying the brine to reduce the total concentration of calcium and magnesium to less than 150 ppb via ion exchange; electrolyzing the brine to generate a lithium hydroxide solution containing less than 150 ppb total calcium and magnesium, with chlorine and hydrogen gas as byproducts; producing hydrochloric acid via combustion of the chlorine gas with excess hydrogen and subsequent scrubbing of the resultant gas stream with purified water, if elected to do so; and concentrating and crystallizing the lithium hydroxide solution to produce lithium hydroxide monohydrate crystals. | 02-24-2011 |
20130272952 | Method for producing hydrogen chloride or an aqueous solution thereof using untreated salt water, thus produced product, use of the product and electrodialysis system - A method of producing hydrogen chloride, or an aqueous solution thereof, includes the steps: a) furnishing a first electrolyte containing chloride ions; b) carrying out an electrodialysis, wherein the first electrolyte is subjected to a cathodic reduction resulting in a catholyte, wherein the concentration of chloride ions drops in the first electrolyte, the concentration of hydroxide ions increases in the first electrolyte, and a product in the form of hydrogen chloride or an aqueous solution thereof is produced; c) processing of at least a partial quantity of the catholyte, resulting in the first electrolyte, wherein an untreated saline water is used, the concentration of chloride ions increases in the catholyte and the concentration of hydroxide ions drops in the catholyte; and d) at least partial reuse of the catholyte processed according to step c) as the first electrolyte in step b). | 10-17-2013 |
20140037534 | The Preparation of Additive Material and its Application in the Cigarette of Tobacco - This invention describes the preparation of additive material and its application in the cigarette of tobacco. This material is titanate nanotube and was synthesized by using a hydrothermal route. Titanate nanotube can be used as additive material in the cigarette of tobacco and the harmful compounds in the mainstream cigarette smoke can be removed significantly. | 02-06-2014 |
423482000 | By reacting alkali metal salt with sulfuric acid | 2 |
20100111819 | CHEMICAL PROCESS TO PRODUCE HYDROGEN CHLORIDE AND CHLORIDE-FREE COMPOUND POTASSIUM SULFATE FERTILIZERS OR OTHER METAL SULFATES - A method is disclosed for production of a sulfate-containing salt and anhydrous gaseous HCl from a metal chloride (MCl | 05-06-2010 |
20110206598 | Preparation of hydrogen fluoride from fluorspar or calcium fluoride containing waste material - A process for the preparation of HF and anhydrite from reaction of calcium fluoride in the form of fines and sulfuric acid. The content of sulfuric acid is kept in a range where no agglomeration occurs. In such process, dust originating from natural fluorspar can be reacted, as well as synthetic calcium fluoride, e.g., from calcium fluoride and optionally calcium carbonate containing solids from treating a waste gas or waste water with basic calcium compounds to remove contained HF. | 08-25-2011 |
423483000 | Hydrogen fluoride | 11 |
20080267855 | PROCESS FOR THE PRODUCTION OF METAL FLUORIDE MATERIALS WITH SUBMICRON STRUCTURES - A process for the production of metal fluorides comprising maintaining a low concentration of the by-products of the reaction between a non-fluorinated metal compound and hydrofluoric acid, so as to produce, by this reaction, sub-micron particle sizes of metal fluoride of high purity. | 10-30-2008 |
20090180947 | Method For Producing Calcium Fluoride, Reusing Method And Recycling Method Thereof - To recycle fluoride by recovering calcium fluoride having a particle size and purity suitable for production of hydrogen fluoride, from a fluoride-containing effluent or a hydrofluoric acid-containing effluent. This method comprises reacting the fluoride-containing effluent or the hydrofluoric acid-containing effluent with an aqueous calcium chloride solution, under an acidic condition with hydrochloric acid where calcium fluoride has a comparatively high solubility. Calcium fluoride having a high purity and a large particle size can be deposited. The hydrochloric acid residues from the reaction or formed through the reaction is reacted with an inexpensive calcium compound such as calcium hydroxide, calcium oxide and calcium carbonate to produce an aqueous calcium chloride solution, and the aqueous calcium chloride solution is reused for the treatment of the hydrofluoric acid-containing effluent. The calcium fluoride obtained can be used as a raw material as it is for producing hydrogen fluoride, and the surplus aqueous calcium chloride solution can be supplied for other industrial uses. | 07-16-2009 |
20100143236 | Preparation of hydrogen fluoride from calcium fluoride and sulfuric acid - Calcium fluoride fines or residues comprising calcium fluoride fines, e.g. residues from treating waste water or waste gas, e.g. originating from HF or fertilizer production, with calcium oxide or calcium carbonate to remove HF or fluorides can be converted to HF and calcium sulfate by reaction with sulfuric acid in the form of a suspension. Unreacted calcium oxide or calcium carbonate generates sufficient heat to the endothermic reaction between calcium fluoride and sulfuric acid so that no external heat is needed. | 06-10-2010 |
20110212017 | Method for the Synthesis of Anhydrous Hydrogen Halide and Anhydrous Carbon Dioxide - A method for the synthesis of anhydrous hydrogen halide fluids from organic halide fluids, such as perfluorocarbon fluids and refrigerant fluids, and anhydrous carbon dioxide for the environmentally safe disposition thereof. | 09-01-2011 |
20130078180 | METHOD FOR PRODUCING HIGH CONCENTRATION AQUEOUS HF SOLUTIONS - Disclosed are methods used to remove HF from a fluorocarbon containing stream, thereby forming a final aqueous HF solution having both a high HF concentration and low dissolved organic content. | 03-28-2013 |
20150353372 | Method for the Production of Free Flowing Synthetic Calcium Fluoride and Use thereof - The invention relates to a process for producing free-flowing calcium fluoride particles from a diluted aqueous solution of hydrogen fluoride comprising the step of reacting the diluted aqueous solution of hydrogen fluoride with calcium carbonate particles at a temperature of less than 50° C. | 12-10-2015 |
20160107892 | METHOD FOR SEPARATING HF FROM HF/HALOGENATED HYDROCARBON MIXTURES USING IONIC LIQUIDS - The present invention relates to an ionic liquid comprised of a salt, the anion of which is Cl | 04-21-2016 |
423484000 | From impure starting material | 4 |
20090304571 | HYDROGEN FLUORIDE COMPOSITIONS - The present invention provides compositions that are intimate mixtures of hydrogen fluoride and a polyacrylate-polyacrylamide cross-linked copolymer. The compositions of the invention are less hazardous and, therefore, more conveniently stored, transported, and handled in comparison to pure hydrogen fluoride. Further, the hydrogen fluoride may be readily recovered from the compositions of the invention for use. | 12-10-2009 |
20110286911 | HYDROGEN FLUORIDE PURIFICATION METHOD - To provide a novel method for purifying hydrogen fluoride, capable of efficiently reducing the content of arsenic in hydrogen fluoride. | 11-24-2011 |
20160176711 | PROCESS FOR PURIFICATION OF HYDROFLUORIC ACID INCLUDING OBTAINING ARSENIOUS ACID BY-PRODUCT | 06-23-2016 |
423485000 | Fluorspar | 1 |
20120107223 | METHOD FOR PRODUCING HYDROGEN FLUORIDE - The present invention provides a novel method for producing hydrogen fluoride, which is capable of using various calcium fluoride sources and preventing a second pasty state from occurring, effectively. | 05-03-2012 |
423486000 | Utilizing an element as reactant | 2 |
423487000 | Reacting elemental hydrogen and elemental halogen | 2 |
20130259796 | METHOD AND SYSTEM FOR PRODUCING HIGH-PURITY HYDROGEN CHLORIDE - The present invention provides a method for producing high-purity hydrogen chloride, comprising the steps of: purifying each of crude hydrogen and crude chlorine as raw materials to a purity of 99.999% or higher; reacting an excessive molar amount of the purified hydrogen with the purified chlorine at a temperature ranging from 1,200° C. to 1,400° C. to synthesize hydrogen chloride; converting the hydrogen chloride to a liquid state by compression; and purifying the hydrogen chloride and separating unreacted hydrogen by fractional distillation. The invention also provides a system for carrying out the method. According to the method and system, an environmentally friendly production process can be provided, which can easily produce a large amount of hydrogen chloride having a purity of 3 N (99.9%)-6 N (99.9999%) in a cost-effective manner and enables energy consumption to be significantly reduced. | 10-03-2013 |
20150056128 | EVAPORATIVE GAS GENERATING DEVICE, METHOD FOR PRODUCING EVAPORATIVE GAS, HYDROGEN BROMIDE PRODUCTION DEVICE, AND METHOD FOR PRODUCING HYDROGEN BROMIDE - An evaporative gas generating device and a method for producing evaporative gas. A hydrogen bromide production device and a method for producing hydrogen bromide are also disclosed. The hydrogen bromide production device is provided with an evaporative gas generating device ( | 02-26-2015 |
423488000 | Recovery or purification | 16 |
20080267856 | Removal of contaminants from by-product acids - The present invention is drawn to a method for removing colloidal titanium dioxide and titanium oxychloride from by-product hydrochloric acid. The method includes adding phosphate ion source and quaternary amine to the by-product acid to cause the titanium dioxide and the titanium oxychloride to form a precipitate. The precipitate can then be separated from the acid, thus producing a decontaminated hydrochloric acid product with reduced levels of titanium. | 10-30-2008 |
20090022653 | METHOD FOR PURIFYING HYDROGEN CHLORIDE - Method for purifying hydrogen chloride gas containing aromatic organic compounds, comprising at least one step of contacting the said hydrogen chloride with a scrubbing agent containing 1,2-dichlorethane. | 01-22-2009 |
20090047208 | Method of forming hypobromous acid in aqueous system - A method which especially can safely produce a hypobromous acid or a water-soluble salt thereof, that does not require expensive equipment or the like, does not involve extra work such as pre-mixing or have restrictions such as producing immediately prior to use, and is simple. Further, a method which can efficiently and rapidly form a hypobromous acid or a water-soluble salt thereof which is stable and has high sterilization/anti-microbial effect, and which does not form harmful bromic acid. At least either a hypobromous acid or a water-soluble salt thereof is formed by reacting at least either a hypochlorous acid or a water-soluble salt thereof with a bromide in a liquid to be treated, wherein the at least either hypobromous acid a water-soluble salt thereof is formed by adding a modified chlorite to the liquid to be treated. | 02-19-2009 |
20100135895 | Process for Purifying HBr in Hydrocarbons - The present invention provides a method for separating HBr from HBr-containing hydrocarbons (alkenes, aromatics and/or alkanes) to purify the hydrocarbons. Reacting a silica supported metal oxide solid material (MO | 06-03-2010 |
20100150816 | Methods for Purifying an Aqueous Hydrochloric Acid Solution - Methods for purifying an aqueous hydrochloric acid solution waste stream having an impurity fraction comprising an initial Ti fraction, an initial S fraction and an initial Si fraction; that provide purified aqueous hydrochloric acid solutions having a final Ti fraction of less than 250 ppm, a final S fraction of less than 200 ppm, and a final Si fraction of less than 10 ppm, which may be determined with inductively coupled plasma spectroscopy. Process steps in various embodiments include sparging with an gas; mixing the sparged solution with a precipitation agent comprising a sufficient amount of an alkali earth metal salt and, optionally, a phosphoric acid source, to provide a metal salt precipitate; and mixing the initial aqueous acid solution or, optionally, the sparged aqueous acid solution, with a flocculating polymer. A preferred alkali earth metal salt is barium chloride and preferred flocculating polymers are poly(diallyldialkylammonium chloride) homopolymers and copolymers. | 06-17-2010 |
20110236296 | METHOD OF PURIFYING HYDROCHLORIC ACID - Provided is a method of purifying hydrochloric acid by removing an organic substance having a boiling point of −25° C. to 120° C. under atmospheric pressure from an organic substance-containing hydrochloric acid that contains the organic substance and has a hydrogen chloride concentration higher than an azeotropic hydrogen chloride concentration under atmospheric pressure. The method includes the step of subjecting the organic substance-containing hydrochloric acid to distillation using a distillation tower at an operation pressure set such that an azeotropic hydrogen chloride concentration under the operation pressure is higher than the hydrogen chloride concentration of the organic substance-containing hydrochloric acid, to distill out the organic substance from the top of the distillation tower. | 09-29-2011 |
20120134912 | PROCESS FOR THE RECOVERY OF HYDROCHLORIC ACID - The Invention provides a process for the recovery of gaseous HCl comprising: a) providing an HCl-carrying extractant comprising: (i) an oil soluble amine which amine is substantially water insoluble both in free and in salt form; and (ii) a solvent for the amine and organic acid; b) contacting the HCl-carrying extractant with at least one non-volatile mineral acid, and c) stripping gaseous HCl, whereby HCl-depleted extractant and gaseous HCl are formed. | 05-31-2012 |
20130028832 | METHODS FOR THE SEPARATION OF HCL FROM A CARBOHYDRATE AND COMPOSITIONS PRODUCED THEREBY - The present invention provides an organic phase composition comprising:
| 01-31-2013 |
20130028833 | METHOD FOR PREPARING A HYDROLYZATE - The present invention provides an organic phase composition comprising
| 01-31-2013 |
20130287675 | Removal of Bromine From Gaseous Hydrogen Bromide - A new, highly selective way of removing bromine contamination from a gaseous stream comprised of hydrogen bromide and bromine is described. Such process technology involves non-catalyzed free radical (benzylic) bromination of an alkylene-bridged aromatic hydrocarbon and/or certain alkyl-substituted aromatic hydrocarbons and recovering the purified gaseous HBr. Because of the high selectivity of the bromination on the aliphatic bridges or side-chains, virtually no ring bromination occurs, and this enables recovery of the bromine values in the form of HBr. Thus preferably, the bromine is recovered as HBr from the scrubbing liquid by subjecting the scrubbing liquid to thermal or catalytic dehyrobromination. In plant operations, the gaseous HBr purified in the process can then be introduced into a compressor to produce either liquid or gaseous HBr for storage under pressure. Alternatively, the purified gaseous HBr can be fed directly into one or more reactions in which HBr is used as a reactant. | 10-31-2013 |
20140147373 | Process to separate phosgene and hydrogen chloride from a fluid stream comprising phosgene and hydrogen chloride - A process according to the invention is a process to separate an initial fluid stream comprising phosgene and hydrogen chloride in at least a first and a second fluid stream, said first fluid stream being a hydrogen chloride enriched and phosgene depleted gaseous stream, said second fluid stream being a hydrogen chloride depleted and phosgene enriched stream. The separation is performed by feeding said initial fluid stream to a membrane separation unit, said membrane separation unit separating said initial fluid stream in a first and a second fluid stream | 05-29-2014 |
20150147265 | Removal of Bromine From Gaseous Hydrogen Bromide - Processes of and systems for removing free bromine from gaseous anhydrous HBr contaminated with free bromine are described. In one type of process the gaseous contaminated HBr is fed into countercurrent contact with at least one liquid alkylaromatic hydrocarbon within a packed section of a column while maintaining the packed section under free radical bromination conditions so that one or more than one liquid a-bromoalkylaromatic compound is produced along with one mole of gaseous HBr per mole of a-bromoalkylaromatic compound produced. In another type of process the gaseous anhydrous HBr is fed into countercurrent contact through at least two scrubbers so that the gaseous anhydrous HBr is scrubbed substantially free of bromine by passage through these at least two scrubbers, each of which contains a different specified type of scrubbing liquid. In one embodiment the liquid alkylaromatic hydrocarbon comprises 1,2-diphenylethane. | 05-28-2015 |
20150343414 | METHOD FOR PROCESSING HYDROGEN CHLORIDE FROM ISOCYANATE PREPARATION - A method for processing hydrogen chloride from isocyanate preparation comprises the steps: a) providing hydrogen chloride; b) purifying the hydrogen chloride provided; and furthermore step c) or step d):
| 12-03-2015 |
20150345033 | PROCESS AND APPARATUS FOR GENERATING OR RECOVERING HYDROCHLORIC ACID FROM METAL SALT SOLUTIONS - The present invention relates to an electrochemical process for generating or recovering hydrochloric acid from metal salt solutions such as acidic metal salt solutions and saline solutions. The process is useful for treating acidic salt solutions that are waste products from mineral processing or other industrial processes such as metal finishing, water softening, water treatment, reverse osmosis, electrodialysis, coal seam gas extraction, shale gas extraction and shale oil extraction, to generate high purity hydrochloric acid, metal salts and recycled water that may be re-used in the industrial process. An apparatus for performing the electrochemical process is also described. | 12-03-2015 |
20160130143 | A Process For The Removal Of Metal Contaminants From Fluids - The present disclosure provides a process for removing metal contaminants from a contaminated fluid stream comprising the step of contacting said fluid stream with macroporous alpha alumina to obtain a fluid stream containing less than 50 ppm of metal. The fluid stream can be selected from the group consisting of a stream of mineral acid(s) and a stream of alkylene(s); and the metal contaminant can be at least one of elemental metals and metal oxides. The process further comprises a step of obtaining spent macroporous alpha alumina and regenerating active macroporous alpha alumina therefrom by washing said spent macroporous alpha alumina with at least one purified stream selected from the group consisting of a stream of mineral acid(s) and a stream of alkylene(s). | 05-12-2016 |
20160145714 | TREATMENT PROCESS FOR EXTRACTION OF PRECIOUS, BASE AND RARE ELEMENTS - This invention describes a hydrometallurgical process for the recovery and separation of valuable elements, in particular gold and silver, from a feed material comprising a refractory, intractable or otherwise poorly responding to conventional treatment routes ores, concentrates and other materials. In particular, the process is a process integrated into one or more existing value element extraction processes. | 05-26-2016 |