Patent application number | Description | Published |
20080214871 | Method For Producing A Xylylene Diamine - A process for preparing a xylylenediamine by heterogeneously catalyzed hydrogenation of a phthalonitrile, wherein the hydrogenation is carried out in the presence of a cobalt skeletal catalyst, of an alkali metal hydroxide and of an alcohol and/or ether as the solvent, at an absolute pressure in the range from 1 to 100 bar and a temperature in the range from 40 to 150° C. | 09-04-2008 |
20080262266 | Method for the Production of Xylyendiamine - Process for preparing o-, m- or p-xylylenediamine by hydrogenation of o-, m- or p-phthalonitrile in the presence of a heterogenous catalyst, which comprises feeding a solution of the phthalonitrile in the corresponding isomer of crude xylylenediamine into the hydrogenation reactor, with the crude xylylenediamine having a purity in the range from 85 to 99.7% by weight and a content of higher boilers in the range from 0.3 to 15% by weight. | 10-23-2008 |
20090020407 | METHOD FOR PRODUCING PURE XYLYLENEDIAMINE (XDA) - A process comprising: continuously distilling a crude xylylenediamine in a column to form a pure xylylenediamine and a bottom product, wherein the column comprises a distillation column having a side draw and the distillation column is operated under a reduced pressure and a bottom temperature of 185° C. or less; drawing off the pure xylylenediamine from the side draw; evaporatively concentrating the bottom product of the distillation column in an additional evaporation stage to form a condensate; and returning the condensate into the distillation column | 01-22-2009 |
20090158930 | REFITTING PLANTS FOR ACID GAS REMOVAL - A method for removing acid gases from a fluid stream in which the fluid stream, in contact with an absorption medium in the form of an aqueous amine solution in an absorber, is passed through a first absorption zone and through a second absorption zone, the loaded absorption medium is passed into a first regeneration zone, a part of the resultant partially regenerated absorption medium is passed into the first absorption zone, the other part of the partially regenerated absorption medium is passed into a second regeneration zone, and a part of the resultant regenerated absorption medium is passed into the first absorption zone and the other part of the regenerated absorption medium is passed into the second absorption zone. The method can be carried out with few changes to apparatus of a hot pot plant, the energy requirement for the same performance being no higher than in the hot pot process. | 06-25-2009 |
20100016625 | METHOD FOR PRODUCING AMINONITRILES - The invention relates to a process for preparing an amino nitrile mixture comprising aminoacetonitrile (AAN) and from 5 to 70% by weight of iminodiacetonitrile (IDAN), which comprises heating crude AAN which is largely free of formaldehyde cyanohydrin (FACH-free) at a temperature of from 50 to 150° C. | 01-21-2010 |
20100029976 | METHOD FOR PRODUCING TETRAETHYLENEPENTAMINE - The invention relates to a process for preparing tetraethylenepentamine (TEPA) by hydrogenation of diethylenetriaminediacetonitrile (DETDN) over a catalyst. If appropriate, DETDN can also be present as a constituent of an amino nitrile mixture which additionally comprises diethylenetriaminemonoacetonitrile (DETMN). | 02-04-2010 |
20100029991 | METHOD FOR PRODUCING TRIETHYLENETETRAMINE - The invention relates to a process for preparing triethylenetetramine (TETA), which comprises hydrogenating ethylenediaminediacetonitrile (EDDN) in the presence of a catalyst and a solvent. | 02-04-2010 |
20100056828 | METHOD FOR PRODUCING ETHYLENEAMINES - The invention relates to a process for preparing an ethylene amine mixture, which comprises hydrogenating an amino nitrile mixture comprising at least 30% by weight of aminoacetonitrile (AAN) and at least 5% by weight of iminodiacetonitrile (IDAN) in the presence of a catalyst. Ethylenediamine (EDA) and/or diethylenetriamine (DETA) and, if appropriate, further ethylene amines can be isolated from the ethylene amine mixtures obtained. | 03-04-2010 |
20100094057 | METHOD FOR PRODUCING ETHYLENEDIAMINE - The invention relates to a process for preparing ethylenediamine by hydrogenation of aminoacetonitrile over a catalyst, wherein the hydrogenation is carried out in a solution comprising aminoacetonitrile, water in a proportion of from 0 to 60% by weight and a solvent and the aminoacetonitrile comprised in the solution is fed into the reaction vessel at a rate which is not greater than the rate at which the aminoacetonitrile reacts with hydrogen in the hydrogenation. | 04-15-2010 |
20100099872 | PRODUCTION METHOD FOR ETHYLENEAMINE MIXTURES - The invention relates to a process for preparing an ethylene amine mixture, which comprises hydrogenating an amino nitrile mixture comprising at least two α-amino nitriles in an amount of at least 5% by weight in each case in the presence of a catalyst and, if appropriate, a solvent. | 04-22-2010 |
20100105940 | FULL CATALYST, PRODUCTION THEREOF, AND USE THEREOF IN AN AMMOXIDATION PROCESS - Catalysts comprising: (a) a support material comprising a component selected from the group consisting of aluminum oxide, silicon dioxide, aluminum silicate, magnesium silicate, titanium dioxide, zirconium dioxide, thorium dioxide, silicon carbide, and mixtures thereof; and (b) an active material comprising a mixture of vanadium (V) and antimony (Sb) and tungsten (W) and/or molybdenum (Mo), and optionally, at least one alkali metal, wherein the vanadium, antimony, tungsten and/or molybdenum and at least one alkali metal are each present in oxidic form; wherein the support material is provided in a form selected from the group of shapes consisting of spherical or approximately spherical and having a diameter of 2 to 10 mm, tubular or rod-shaped and having a diameter of 1 to 10 mm and a length of 2 to 20 mm, granular having a maximum diameter of 2 to 20 mm, and combinations thereof; and wherein the catalyst is diluted with an inert material; along with processes for preparing such catalysts and their use in preparing nitriles via gas phase ammonoxidation. | 04-29-2010 |
20100121064 | NOVEL METHOD FOR PRODUCING TETA BY MEANS OF EDDN - The invention relates to a process for preparing triethylenetetramine (TETA), which, comprises the following steps:
| 05-13-2010 |
20120101303 | METHYL-SUBSTITUTED TETA COMPOUNDS - The invention relates to a process for preparing triethylenetetramine substituted by at least one methyl group (Me-TETA or methyl-substituted TETA compounds). Me-TETA is prepared by hydrogenating biscyanomethylimidazolidine (BCMI) in the presence of a catalyst. The present invention further relates to methyl-substituted TETA compounds as such. The present invention further relates to the use of methyl-substituted TETA compounds as a reactant or intermediate in the production of, for example, coatings or adhesives. | 04-26-2012 |
20130053536 | PROCESS FOR PREPARING EDDN AND/OR EDMN AND A PROCESS FOR PREPARING DETA AND/OR TETA - A process for preparing EDDN and/or EDMN by
| 02-28-2013 |
20130053537 | PROCESS FOR REGENERATING RANEY CATALYSTS - A process for regenerating Raney catalysts by treating the catalyst with liquid ammonia with a water content of less than 5% by weight and with hydrogen having a partial pressure of 0.1 to 40 MPa in the temperature range from 50 to 350° C. for at least 0.1 hour. | 02-28-2013 |
20130053538 | PROCESS FOR PREPARING EDFA AND/OR EDMFA AND DETA AND/OR TETA - A process for reacting ethylenediamine (EDA) with formaldehyde to give ethylenediamine-formaldehyde adduct (EDFA) and/or ethylenediamine-monoformaldehyde adduct (EDMFA), which comprises performing the reaction of FA with EDA at a temperature in the range from 20 to 70° C. | 02-28-2013 |
20130053539 | PROCESS FOR PREPARING EDDN AND/OR EDMN AND PROCESS FOR PREPARING DETA AND/OR TETA - A process for preparing EDDN and/or EDMN by conversion of FA, HCN and EDA, the reaction being effected in the presence of water, wherein the reaction mixture from the conversion of EDA, HCN and FA is cooled after leaving the reactor. | 02-28-2013 |
20130053540 | PROCESS FOR PREPARING TETA - A process for preparing TETA and/or DETA by the action of EDDN and/or EDMN with hydrogen in the presence of a catalyst, wherein the catalyst used is a catalyst of the Raney type and the pressure in the course of hydrogenation is in the range from 170 to 240 bar. | 02-28-2013 |
20130053584 | PROCESS FOR PREPARING EDDN AND/OR EDMN BY REACTING EDFA AND/OR EDMFA WITH HCN - A process for reacting ethylenediamine-formaldehyde adduct (EDFA) and/or ethylene-diamine-monoformaldehyde adduct (EDMFA) with hydrogen cyanide (HCN) in a reactor with limited backmixing at a temperature in the range from 20 to 120° C., wherein the residence time in the reactor is 300 seconds or less. | 02-28-2013 |
20130053597 | PROCESS FOR PREPARING EDDN, EDMN, TETA AND DETA - A process for preparing ethylenediaminediacetonitrile (EDDN) and/or ethylenediamine-monoacetonitrile (EDMN) by conversion of formaldehyde (FA), hydrogen cyanide (HCN) and ethylenediamine (EDA), which comprises using stabilizer-free HCN, or HCN which has been stabilized with an organic acid, in the process. | 02-28-2013 |
20130060002 | PROCESS FOR WORKING UP REACTION OUTPUTS FROM THE HYDROGENATION OF EDDN OR EDMN - A process is disclosed for separating the output from the reaction of EDDN or EDMN with hydrogen in the presence of THF, a catalyst, TETA or DETA, water, and optionally organic compounds having higher and lower boiling points than TETA or DETA. Hydrogen is removed, and the output is supplied to a distillation column DK1 in which an azeotrope, optionally comprising organic compounds with a boiling point lower than TETA or DETA, is removed from the top. A product comprising TETA or DETA is removed from the bottom and passed cinto a distillation column DK2, removing THF. A stream comprising TETA or DETA passes from the bottom of DK2. The DK1 azeotrope is condensed. Phase separation is induced by the addition of an organic solvent essentially immiscible with water, and the mixture is separated. The organic phase is recycled into DK1 and the water phase is discharged. | 03-07-2013 |
20130079492 | PROCESS FOR PREPARING EDDN AND EDMN - A process for preparing EDDN and/or EDMN by conversion of FA, HCN and EDA, the reaction being effected in the presence of water, and, after the conversion, water being depleted from the reaction mixture in a distillation column, which comprises performing the distillation in the presence of an organic solvent which has a boiling point between water and EDDN and/or EDMN at the distillation pressure existing in the column or which forms a low-boiling azeotrope with water. | 03-28-2013 |
20130085286 | Unknown - A process for preparing amines of the formula (II) | 04-04-2013 |
20130090452 | PROCESS FOR PREPARING EDDN AND/OR EDMN BY CONVERSION OF FACH AND EDA - A process for reacting formaldehyde cyanohydrin (FACH) with ethylenediamine (EDA) in a reactor with limited backmixing at a temperature in the range from 20 to 120° C., wherein the residence time in the reactor is 300 seconds or less. | 04-11-2013 |
20130090453 | Process for preparing TETA and DETA - A process for preparing TETA and/or DETA by hydrogenating EDDN and/or EDMN with hydrogen in the presence of a catalyst, which comprises preparing EDDN and/or EDMN from FA, HCN and EDA in the presence of toluene as a solvent and performing the hydrogenation in suspension mode in the presence of THF. | 04-11-2013 |
20130090496 | PROCESS FOR PREPARING FORMIC ACID BY REACTING CARBON DIOXIDE WITH HYDROGEN - The invention relates to a process for preparing formic acid by reacting carbon dioxide with hydrogen in a hydrogenation reactor in the presence of a catalyst comprising an element of group 8, 9 or 10 of the Periodic Table, a tertiary amine and a polar solvent to form formic acid-amine adducts which are subsequently dissociated thermally into formic acid and tertiary amine. | 04-11-2013 |
20130178684 | PROCESS FOR PROVIDING A VAPOROUS PURIFIED CRUDE C4 CUT AS A FEED STREAM FOR AN EXTRACTIVE DISTILLATION WITH A SELECTIVE SOLVENT - Mixtures of hydrocarbons predominantly having 4 carbon atoms per molecule known as C | 07-11-2013 |
20130197292 | PROCESS FOR PURIFYING A RECYCLE STREAM FROM A 1,3-BUTADIENE PROCESSING PLANT - Secondary streams in 1,3-butadiene processing plants still contain high amounts of valuable 1,3-butadiene. An energy-efficient process for purifying a recycle stream from a 1,3-butadiene processing plant is provided. The recycle stream is divided into two substreams: the first substream for prepurifying pure 1,3-butadiene feedstream by removing high boilers relative to 1,3-butadiene in a stripping column and the second substream in an extractive distillation plant. | 08-01-2013 |