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| Number | Title | Issue Date |
| 7128815 | Process for recovery of pure acrylonitrile Process for recovery of highly pure acrylonitrile by quickly vaporizing under vacuum the contaminated acrylonitrile as well as fresh acrylonitrile followed by contacting with hydrophilic agents in an extractive distillation column using plural number of packed secti... | 10/31/2006 |
| 7091252 | Liquid-continuous column distillation Bubble columns fractionate with vapor-liquid mass transfer efficiencies approaching that of distillation towers when vapor velocities in excess of 50% of jet flood are used. If the vapor velocities are pushed above about 70% of jet flood then the distillation perfor... | 08/15/2006 |
| 6679975 | Process for recovering the methanol contained in a liquid hydrocarbon feed The present invention aims to isolate the azeotropes formed in a distillation column (B1) by methanol, propane and butane. The azeotropes are then liquefied in heat exchanger (E2) and mixed in contactor (M1) with water in order to dissolve the methanol in... | 01/20/2004 |
| 6559248 | Process of removing contaminants from an olefin stream using extractive distillation Disclosed is a method of purifying olefin containing oxygenate contaminants. The method incorporates the use of extractive distillation. Under the appropriate conditions, olefins containing very low levels of oxygenate contaminants can be recovered.... | 05/06/2003 |
| 6531108 | Process for producing free hydroxylamine aqueous solution This invention provides a highly pure and highly concentrated free hydroxylamine aqueous solution substantially not containing any salt or organic substance. This invention is a process for obtaining a free hydroxylamine aqueous solution, comprising the s... | 03/11/2003 |
| 6359155 | Process for the preparation of 3-hydroxytetrahydrofuran An industrial advantage process for producing high-purity 3-hydroxytetrahydrofuran easily and simply, which comprises reducing a 4-halo-3-hydroxybutyric acid ester (1) with a boron hydride compound and/or an aluminum hydride compound as a reducing agent i... | 03/19/2002 |
| 6197163 | Process for removing impurities from petroleum products The impurity content, e.g. propionitrile, in a fraction containing C5 or C6 tertiary olefins obtained by cracking hydrocarbons is reduced by distilling with an alkanol and removing the impurity as a higher boiling point fraction.... | 03/06/2001 |
| 6030524 | Refinery atmospheric pipestill with methanol stripping In an atmospheric pipestill stripping process where steam is utilized as the stripping gas to strip bottoms and side stream products, the improvement comprising utilizing methanol or a methanol and steam mixture as said stripping gas. In a refinery atmosp... | 02/29/2000 |
| 5882485 | Process for the separation of dimethyl ether and chloromethane in mixtures A process for the separation of dimethyl ether and chloromethane in mixtures A process for the separation of dimethyl ether and chloromethane in mixtures by two distillation steps. In the first step, the mixture is subjected to an extractive distillation ... | 03/16/1999 |
| 5830325 | Separating and removing 1, 1, 1-trifluoroethane by using azeotropic distillation The disclosure relates to separating 1,1,1-trifluoroethane (HFC-143a from fluorocarbon impurities by using extractive distillation with an extractive agent comprising an alcohol. Examples of suitable extractive agents comprise at least one member from the... | 11/03/1998 |
| 5698080 | Separation of phellandrene from limonene by azeotropic distillation Phellandrene is difficult to separate from limonene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are ethanol, dioxolane and acetonitrile.... | 12/16/1997 |
| 5470442 | Separating and removing impurities from tetrafluoroethanes by using extractive distillation The disclosure relates to separating 1,1,2,2 tetrafluoroethane (HFC-134) and 1,1,1,2 tetrafluoroethane (HFC-134a) from each other and/or from fluorocarbon impurities by using extractive distillation with an extractive agent comprising an alcohol. Examples... | 11/28/1995 |
| 5466345 | Separation of o-xylene from p-xylene and m-xylene by azeotropic distillation o-Xylene cannot be separated from p-xylene and m-xylene by conventional distillation or rectification because of the proximity of their boiling points. o-Xylene can be readily separated from mixtures of p-xylene and m-xylene by azeotropic distillation. Ef... | 11/14/1995 |
| 5405504 | Separation of 1-decene from 2-octanone by azeotropic distillation 1-Decene is impossible to separate from 2-octanone by conventional distillation or rectification because the two compounds form a minimum boiling azeotrope. 1-Decene can be readily separated from 2-octanone by azeotropic distillation. Effective agents are... | 04/11/1995 |
| 5405505 | Separation of benzene from close boiling hydrocarbons by azeotropic distillation Benzene is difficult to separate from cyclohexane or cyclohexene by conventional distillation or rectification because of the close proximity of their boiling points. Benzene can be readily separated from cyclohexane or cyclohexene by using azeotropic dis... | 04/11/1995 |
| 5292993 | Process for removing impurities from petroleum products The impurity content, e.g. propionitrile, in a fraction containing C5 or C6 tertiary olefins obtained by cracking hydrocarbons is reduced by distilling with an alkanol and removing the impurity as a higher boiling point fraction.... | 03/08/1994 |
| 5227521 | Preparation of trialkylacetic acids, particularly of pivalic acid, using Lewis acid catalysts This invention is a process for the production of trialkyl acetic acids, particularly of pivalic acid, from branched olefins, particularly isobutene, and carbon monoxide using catalytic amounts of a Lewis acid such as boron trifluoride.... | 07/13/1993 |
| 5145989 | Recovery of acrylic acid and/or ethyl acrylate from black acid Black acid or the sulfuric acid residue obtained in the manufacture of ethyl acrylate by reaction of ethylene and acrylic acid in the presence of sulfuric acid is heated and distilled in the presence of a solvent for recovery of acrylic acid and ethyl acr... | 09/08/1992 |
| 4944847 | Method for inhibiting epichlorohydrin fouling A method of inhibiting fouling in distillation towers, overhead lines, reflux lines, and condensers operating in a process to manufacture and purify epichlorohydrin. This method resides in treating process streams entering or exiting such towers, lines an... | 07/31/1990 |
| 4879407 | Process for the preparation of ethyl trifluoroacetate A process for the preparation of ethyl trifluoroacetate, in which: in a first stage, trifluoroacetic acid is brought into contact with a slight excess of ethanol in the presence of concentrated sulfuric acid and a solvent, the solvent having a boiling point hi... | 11/07/1989 |
| 4798674 | Separation of organic liquids Mixtures containing methanol and dimethyl carbonate or methanol and methyl t-butyl ether may be treated by pervaporation to recover product containing decreased quantity of methanol.... | 01/17/1989 |
| 4761492 | Process for recovering trimethoxysilane from a trimethoxysilane and methanol mixture An extractive distillation process for recovering trimethoxysilane from a trimethoxysilane-methanol mixture is provided using as the extractive solvent tetramethoxysilane.... | 08/02/1988 |
| 4760165 | Recovering useful components at least containing dimethyl terephthalate from high-boiling byproducts occurring in the production of dimethyl terephthalate A method of recovering useful components at least containing dimethyl terephthalate from high-boiling byproducts occurring in the production of dimethyl terephthalate, which comprises oxidizing p-xylene and/or methyl p-toluate with a molecular oxygen-cont... | 07/26/1988 |
| 4730082 | Process for the preparation of methyltrifluoroacetate A process for the preparation of methyltrifluoroacetate. Trifluoroacetic acid is contacted with an excess of methanol and distilled to form a methyltrifluoroacetate/methanol azeotrope. The azeotrope is contacted with trifluoroacetic acid in the presence o... | 03/08/1988 |
| 4714526 | Supercritical fluid extraction method for multi-component systems A process for extracting pure components from a multi-component system, said system comprising a mixture of at least two solids or liquids in a supercritical fluid at constant pressure, which involves making use of the cross-over pressure points of the co... | 12/22/1987 |
| 4476036 | Quaternary 1,1,2-trichloro-1,2,2-trifluoro azeotropic cleaning composition Quaternary azeotropic mixtures of 1,1,2-trichloro-1,2,2-trifluoroethane, methylene chloride, methanol and cyclopentane are provided. These azeotropic mixtures are useful as solvents to remove buffing compounds residues. These mixtures are useful not only ... | 10/09/1984 |
| 4454356 | Producing methyl ethers of branched monoolefins Methanol is reacted with branched monoolefins such as isobutylene, or mixtures of hydrocarbons such as mixed C-4's from or in a refinery, in the presence of methanesulfonic acid. A column (10) operation is described wherein methanesulfonic acid (11) and m... | 06/12/1984 |
| 4414063 | Removing residual acrylonitrile in aqueous dispersions Removal of acrylonitrile from latex by azeotropic distillation with methanol.... | 11/08/1983 |
| 4365081 | Process for producing 2-hydroxyalkyl acrylates or methacrylates In a process for producing a 2-hydroxyalkyl acrylate or methacrylate which comprises esterifying acrylic or methacrylic acid with an alkylene oxide having 2 to 4 carbon atoms in the presence of an esterification catalyst and distilling the resulting react... | 12/21/1982 |
| 4365080 | Production of dimethyl esters This invention provides an improved process for the separation and recovery of byproducts associated with the isolation of C4 -C6 dicarboxylic acids contained in a waste byproduct stream derived from an adipic acid manufacturing oper... | 12/21/1982 |
| 4319980 | Method for treating coal to obtain a refined carbonaceous material A process is described for obtaining a refined, carbonaceous product from essentially raw coal by treating the coal with an amine solution to dissolve a portion of the coal, leaving undissolved coal and waste material such as ash. The dissolved coal is se... | 03/16/1982 |
| 4311851 | Preparation of carboxylic acid esters with BF3 -alcohol complex catalyst The invention includes a process wherein an olefin is carbonylated with carbon monoxide to form carboxylic acid esters in the presence of a catalyst complex of one mole of BF3 and one mole of alcohol, and the catalyst is recovered from the desi... | 01/19/1982 |
| 4299999 | Process for the preparation and isolation of methyl-tert-butyl ether Process for producing and isolating methyl-tert-butyl ether (MTBE) comprising etherifying isobutene, contained in a C4 hydrocarbons mixture, with methanol in the presence of a recycle stream of C5 and/or C6 hydrocarbons, s... | 11/10/1981 |
| 4271315 | Treatment of waste stream from adipic acid manufacture This invention provides a process for improving the recovery of byproducts associated with the isolation of C4 -C6 dicarboxylic acids contained in a waste byproduct stream, derived from an adipic acid manufacturing operation wherein ... | 06/02/1981 |
| 4262138 | Preparation of carboxylic acid esters with BF3 complex catalyst In a process wherein ethylene or propylene is carbonylated with carbon monoxide to form carboxylic acid esters in the presence of a catalyst complex of one mole of BF3 and one mole of alcohol, the invention concerns a technique wherein the cata... | 04/14/1981 |
| 4260827 | Process for the purification of aqueous solutions of low molecular weight polyhydroxyl compounds The invention is directed to a process for the purification of aqueous solutions of low molecular weight polyhydroxyl compounds containing calcium or lead compounds or mixtures thereof. Methanol and a precipitant for calcium and/or lead ions in a quantity... | 04/07/1981 |
| 4256913 | Preparation of carboxylic acids using a BF3 catalyst complex Propylene and ethylene may be carbonylated to form carboxylic acid esters or carboxylic acids in the presence of a catalyst complex containing 1 mole of BF3 and 1 mole of a second complexing component. The carboxylic acid product or acid portio... | 03/17/1981 |
| 4250328 | Method for separation of an ester from a reaction mixture An improved method for separating an ester formed in a reaction mixture is disclosed. The method comprises controlling the ratio of organic acid and alcohol utilized and the removal of unreacted alcohol as an alcohol-ester azeotrope.... | 02/10/1981 |
| 4243493 | Process for transportation and distillation of petroleum with methanol An improved petroleum distillation process in which methanol is added to the petroleum to be distilled and methanol/hydrocarbon azeotrope is recovered boiling at about 63° C. which can be used as a fuel. The methanol can be derived from natural gas or an... | 01/06/1981 |
| 4229263 | Recovery of methyl heptafluorobutyrate from methanol by distillation Esters are treated with alkali metal borohydride to produce alcohols. Substantially constant boiling admixtures of: methanol/methyl heptafluorobutyrate, water/1,1-dihydroheptafluorobutanol, and water/methyl heptafluorobutyrate are described.... | 10/21/1980 |
