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| Number | Title | Issue Date |
| 7361795 | Azeotrope-like compositions of 1,1,1,3,3-pentafluorobutane and hydrogen fluoride The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluorobutane (HFC-365) and hydrogen fluoride and a process for separating the azeotrope-like mixtures. The compositions of the invention are useful as an intermediate in the production... | 04/22/2008 |
| 7249469 | Method for separating a multicomponent stream This invention relates to a method for separating a stream having benzene, toluene and alkyl benzene, said method comprising: feeding the stream into a first distillation column, wherein the stream comprises between about 60 mole percent to about 85 mole percent tol... | 07/31/2007 |
| 7241928 | Process for the manufacture of halocarbons and selected compounds and azeotropes with HF A liquid phase process is disclosed for producing halogenated alkane adducts of the formula CAR1R2CBR3R4 (where A, B, R1, R2, R3, and R4 are as defined in the specification) whic... | 07/10/2007 |
| 7147757 | Method for separating an azepine derivative out of a mixture containing an amine an azepine derivative The invention relates to a method for separating by distillation a portion or the entirety of an azeptine derivative (III), which is selected from the group consisting of aminohexylidene imine, tetrahydroazepine, hexylhexahydroazepine and of aminohexylhexahydroazepi... | 12/12/2006 |
| 7128814 | Process for separating 2-butanol from tert-butanol/water mixtures The present invention relates to a process for separating 2-butanol from tert-butanol/water by adding of tert-butanol such that the water concentration lowers to less than the limit concentration of the distillation boundary line connecting the two azeotropes TBA/wa... | 10/31/2006 |
| 7128813 | Process for manufacturing high purity methacrylic acid A process for the high yield production of high purity glacial methacrylic acid (“HPMAA”) with minimization of decomposition of hydroxy isobutyric acid (HIBA). The HPMAA is substantially pure, specifically 99% pure or greater with a water content of 0.05% or les... | 10/31/2006 |
| 7125474 | Process for removing 2-butanol from tert-butanol/water mixtures The invention relates to a process for separating 2-butanol from an industrial mixture which includes 2-butanol, tert-butanol and water by separating water from the industrial mixture by distillation to obtain a distillate, wherein the distillate has, in terms of th... | 10/24/2006 |
| 7074971 | Recovery of ethylene and propylene from a methanol to olefin reaction system The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetyl... | 07/11/2006 |
| 7074434 | Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, processes for the preparation of a hydrofluoroalkane and azeotropic compositions Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, according to which a hydrofluoroalkane/hydrogen fluoride mixture is reacted with at least one chlorinated or chlorofluorinated precursor of the hydrofluoroalkane... | 07/11/2006 |
| 6984293 | Azeotropic distillation of cyclic esters of hydroxy organic acids Cyclic esters of hydroxy organic acids can be produced and recovered via azeotropic distillation. In certain embodiments cyclic esters, such as glycolide and lactide, can be produced from a fermentation broth or other feed stream that contains a hydroxy organic acid... | 01/10/2006 |
| 6972075 | Method for removing 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine The invention relates to a method for removing, by distillation, 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, by a) removing the hexamethylenediamine from the mixture while obtaining a mixture (I) that ... | 12/06/2005 |
| 6955743 | Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor The invention relates to a process for recovering and producing chemicals in a pulp production process where organic chemicals, such as formic acid and acetic acid, are used as cooking chemicals. The process of the invention is based on regeneration of cooking acids... | 10/18/2005 |
| 6936724 | Process for producing epsilon-caprolactone A process produces ε-caprolactone by the oxidation of cyclohexanone by feeding a crude reaction mixture to a first distillation column; distilling off a first distillate containing low boiling components including unreacted cyclohexanone from the top of the first d... | 08/30/2005 |
| 6905576 | Method and system for producing silane This invention relates to a continuous process for the preparation of silane by catalytic disproportionation of trichlorosilane in a reactive/distillative reaction zone having a catalyst bed of catalytically active solid. ... | 06/14/2005 |
| 6896772 | Method for separating ammonia from solutions containing caprolactam and ammonia A process for distillative removal of ammonia from solutions (I) which include a lactam and ammonia comprises effecting said removal in a distillation apparatus (a) at an absolute pressure of less than 10 bar. ... | 05/24/2005 |
| 6887352 | Distillative method for separating hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine A method for recovering hexamethylene diamine (HMD) from a mixture comprising HMD, 6-aminocapronitrile (ACN) tetrahydroazepine (THA), and adiponitrile (ADN) is disclosed. The method includes introducing the mixture into a first distillation column, separating... | 05/03/2005 |
| 6863780 | Process of separating/purifying pentafluoropropane There is provided an azeotropic mixture having 1,1,1,3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture of R-245fa and HF wherein the mixture of 1,1,1,3,3-pentafluoropropane and... | 03/08/2005 |
| 6846389 | Method for distillative separation of mixtures containing tetrahydrofuran, γ-butyrolactone and/or 1,4-butanediol In a process for the continuous fractional distillation of mixtures comprising tetrahydrofuran, γ-butyrolactone and/or 1,4-butanediol to give at least three fractions, the fractionation is carried out in an assembly of distillation columns comprising at least one d... | 01/25/2005 |
| 6692616 | Method for purifying trimethylolpropane, which is produced by hydrogenation, by means of continuous distillation A process is disclosed for the purification, by distillation, of trimethylolpropane originating from the hydrogenation of 2,2-dimethylolbutanal, said process including the following steps: (a) reaction of n-butyraldehyde with formaldehyde in the presence o... | 02/17/2004 |
| 6673264 | Azeotrope-like compositions of 1,1,1,3,3-pentafluorobutane and hydrogen fluoride The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluorobutane (HFC-365) and hydrogen fluoride and a process for separating the azeotrope-like mixtures. The compositions of the invention are useful as an intermediate in the... | 01/06/2004 |
| 6632330 | Process for purification of alkyl alkanoate A process for the recovery of substantially pure alkyl alkanoate, such as ethyl acetate, from an impure feedstock. The impure feedstock is contacted with a selective hydrogenation catalyst in the presence of hydrogen in a selective hydrogenation zone main... | 10/14/2003 |
| 6627046 | Separation of the products of polyamide ammonolysis The useful reaction products in an output stream from an ammonolysis reactor are separated in a manner which minimizes the time during which high boiling polyamide intermediate material(s) are in contact with the amine-functional monomer product(s) or wit... | 09/30/2003 |
| 6599398 | Recovery of adiponitrile from a mixture of adiponitrile, aminocapronitrile and hexamethylenediamine Process for the recovery of a purified adiponitrile (ADN) from a mixture of adiponitrile, aminocapronitrile and hexamethylenediamine, utilizing two sequential distillations: (1) a first distillation in which the mixture is distilled in a distillation colu... | 07/29/2003 |
| 6540882 | Processes for the synthesis of pentafluorobutane and the separation of hydrogen fluoride and pentafluorobutane mixtures The invention relates to a process of separation of mixtures containing HFC-365mfc/HF azeotropic compositions by two distillations at different pressures, as well as to a process of synthesis of HFC-365mfc which integrates this process of separation and a... | 04/01/2003 |
| 6508916 | Process for recovering processing liquids A process for recovering processing liquids such as gas-treating liquids wherein a feed mixture containing the processing liquid, water, and optionally additional components that are more volatile than the processing liquid and components that are less vo... | 01/21/2003 |
| 6488817 | Purification of hydrofluorocarbons A process for the purification of difluoromethane comprising: (a) subjecting a mixture comprising at least difluoromethane (HFC-32) and dichlorodifluoromethane (CFC-12) to a first distillation step in which a majority of either CFC-12 or HFC-32 is concentrated... | 12/03/2002 |
| 6444096 | Process for the recovery and purification of cyclobutanone A process for the recovery and purification of cyclobutanone from a crude product mixture obtained from an oxidation product mixture resulting from the oxidation of cyclobutanol to cyclobutanone in the presence of water. The process provides for the recov... | 09/03/2002 |
| 6419797 | Method for producing metal-free Guerbet alcohols There is provided a process for producing Guerbet alcohols not containing any heavy metals or soaps, wherein primary and/or secondary alcohols having 2 to 30 carbon atoms are condensed at elevated temperature in the presence of alkaline catalysts and/or h... | 07/16/2002 |
| 6375808 | Process for producing difluoromethane A process for refining difluoromethane by removing hydrogen fluoride, which is contained in difluoromethane difficult to remove. The process involves distilling a mixture of difluoromethane with hydrogen fluoride where the mixture is in contact with sulfu... | 04/23/2002 |
| 6299734 | Preparation of an aqueous solution of free hydroxylamine An aqueous solution of free hydroxylamine is prepared by treating a hydroxylammonium salt with ammonia by the countercurrent method in a stripping column by a process in which hydroxylamine is liberated and at the same time the solution obtained is separa... | 10/09/2001 |
| 6235162 | Ultrapure hydroxylamine compound solutions and process of making same In one embodiment, the present invention relates to a method of treating a solution containing hydroxylamine, involving subjecting the solution containing hydroxylamine to fractional distillation using a packed column thereby providing a first distillate;... | 05/22/2001 |
| 6214172 | Preparation of methylglyoxal dimethyl acetal In a process for the preparation of methylglyoxal dimethyl acetal from methylglyoxal and methanol in the presence of an acidic ion exchanger, water is introduced in an amount sufficient to form an acidic reaction mixture in which the acetal product and wa... | 04/10/2001 |
| 6156160 | Alkylene carbonate process This invention concerns a process to provide high purity alkylene carbonate though use of multiple distillations wherein the unused fractions are recycled to the reactor.... | 12/05/2000 |
| 6106674 | Operable and efficient distillation schemes for multicomponent separations The present invention teaches an efficient and easier to operate distillation system to separate mixtures containing three or more components into streams enriched in one of the components. In this invention, a liquid stream enriched in the least volatile... | 08/22/2000 |
| 6048441 | Isolation of neopentyl glycol hydroxypivalate (NGH) Neopentyl glycol hydroxypivalate (NGH) is isolated from a mixture containing NGH, lower- and higher-boiling products and inorganic salts and purified in a two-stage process, wherein in a first separation stage, the inorganic salts and part of the higher-b... | 04/11/2000 |
| 6024840 | Propylene oxide purification Propylene oxide obtained by an epoxidation process which uses methanol as a solvent may be effectively treated to remove acetaldehyde by subjecting the crude epoxidation reaction product to fractional distillation. The methanol solvent is utilized during ... | 02/15/2000 |
| 5993608 | Process for recovering processing liquids A process for recovering processing liquids such as gas-treating liquids wherein a feed mixture containing the processing liquid and components or impurities that are more volatile and less volatile than the processing liquid is initially heated in a firs... | 11/30/1999 |
| 5985100 | Process for separating butanol and dibutyl ether by means of dual-pressure distillation Butanol and dibutyl ether are separated from a mixture containing water, dibutyl ether and n-butanol, 2-butanol and/or isobutanol by a process in which a) the mixture is introduced into a first distillation column, essentially butanol is separated off at ... | 11/16/1999 |
| 5948213 | Processes for the manufacture and purification of 1,1,2,2,3,3,4,4-octafluorobutane and by-products, and azeotropes with HF A process is disclosed for producing 1,1,2,2,3,3,4,4-octafluorobutane. The process involves (a) reacting a mixture comprising 2,2,3,3-tetrafluorobutane and chlorine to form a mixture of chloro-compounds wherein compounds of the formula C4 H | 09/07/1999 |
| 5935388 | Distillation plant with a heat pump A distillation plant includes a heat pump whose working fluid is compressed by a vapor jet compressor. A collection location for a liquid is arranged in the stripper part of a distillation column of the plant. At least a portion of the collected liquid is... | 08/10/1999 |
