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| Number | Title | Issue Date |
| 7373258 | Method for monitoring and regulating selective hydrogenation of olefinic gasoline fractions This invention describes a method for determining the content of conjugated diolefins by means of the measurement of the MAV of a sample of catalytic cracking gasoline or thermal cracking gasoline, from its NIR (near-infrared) spectrum, and the application of said m... | 05/13/2008 |
| 7348466 | Solvent extraction In a method for the solvent extraction of butadiene from a mixture of hydrocarbons having four carbon atoms per molecule, which method inherently produces tars, the extraction process is operated with a tar loading level, relative to the solvent employed, of no more... | 03/25/2008 |
| 7311807 | Process for the separation of mixtures containing m-and p-dichlorobenzene A process for the separation of dichlorobenzene mixtures containing m- and p-dichlorobenzene in which: (i) the mixture is as an extracting agent contacted with a phosphoric ester of the general formula (I) as an extracting agent | 12/25/2007 |
| 7306705 | Method for dehydrating composition comprising lithium bis(pentafluoroethanesulfonyl)imide A method for dehydrating an aqueous composition comprising lithium bis(pentafluoroethanesulfonyl)imide and at least one organic solvent, wherein a part of solvent is distilled off by distillation. ... | 12/11/2007 |
| 7273835 | Azeotrope-like compositions of difluoromethane The invention relates to azeotropic and azeotrope-like mixtures of HFC-32 and HCl or a mixture of HCl and Cl2, and a process for separating the azeotrope-like mixtures. ... | 09/25/2007 |
| 7208640 | Process for isolating highly pure 2-methoxypropene A process for isolating purified 2-methoxypropene from a mixture which comprises 2,2-dimethoxypropane, 2-methoxypropene, methanol, acetone, and optionally other carbonyl group-containing compounds, which process involves subjecting the mixture to distillation, addin... | 04/24/2007 |
| 7205438 | Solvent recovery blends from diene production A diene production stream comprising a solvent recovery blend from diene production comprising one or more fouling agent, one or more extractive distillation solvent, and from about 1 ppm to about 1000 ppm of N,N-disubstituted amide. ... | 04/17/2007 |
| 7189311 | Purification of difluoromethane A method for separating difluoromethane from a mixture of difluoromethane and at least one impurity, the method involving extractively distilling the mixture using dichloromethane as an extractive agent to recover a product stream of purified difluoromethane having ... | 03/13/2007 |
| 7182839 | Preventing deposition of fouling agents onto equipment Methods and compositions effective to prevent deposition of fouling agents, preferably polymerization precursors, on handling equipment, particularly during solvent recovery. ... | 02/27/2007 |
| 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 |
| 6458249 | Process for purifying perfluorinated products Nitrogen trifluoride (NF3) containing less than 10 parts-per-million molar impurities, e.g., tetrafluoromethane (PFC-14), is disclosed. Azeotropic and extractive distillation processes using entraining agents for separating NF3 and P... | 10/01/2002 |
| 6358402 | Extractive distillation process for the reduction of sulfur species in hydrocarbons streams A method for separating sulfur species from hydrocarbon streams, particularly cracked naphtha streams, using extractive distillation. The method effectively separates sulfur species from cracked naphtha streams without substantially lowering the olefin co... | 03/19/2002 |
| 6120652 | Method for purifying crude 1,1,1,3,3-pentafluoropropane The invention relates to a method for purifying a crude 1,1,1,3,3-pentafluoropropane (HFC-245fa) containing HFC-245fa and 1-chloro-3,3,3-trifluoro-trans-1-propene (HCFC-1233zd(t)), by distillation. This method is characterized in that the distillation is ... | 09/19/2000 |
| 5964987 | Neutral oil removal from natural cresylic acid mixtures Natural cresylic acid is processed to remove neutral oil impurities by countercurrent liquid/liquid extraction using a heavy phase solvent of a mixture of glycerol and another polyhydric alcohol, preferably triethylene glycol. The light phase solvent is a... | 10/12/1999 |
| 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 |
| 5817729 | Vapor precipitation of polymers from solvent polymer blends by azeotropic spray drying A process for removing contaminating solvents from solutions containing solid solutes comprising contacting a co-solvent that forms an azeotrope with the contaminating solvent forming a mixture thereby and spray drying the contaminating solvent co-solvent... | 10/06/1998 |
| 5772852 | Separating HCI and halocarbons A process for separating HCl from pentafluoroethane, chloropentafluoroethane, chlorotrifluoroethane, trifluoromethane, and other fully saturated and unsaturated fluorocarbons, chlorofluorocarbons and chlorocarbons.... | 06/30/1998 |
| 5730844 | Liquid phthalic anhydride recovery process using a rectification tower with benzoic acid control A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130° C. or greater with a first stream comprising maleic anhydride, benzoi... | 03/24/1998 |
| 5718808 | Solvent assisted process for recovery of phthalic anhydride in the liquid phase by distillation A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130° C. or greater with a first stream comprising a solvent having a boili... | 02/17/1998 |
| 5693193 | Process for recovering propylene oxide Propylene oxide is recovered through the use of an additive in a distillation solution, resulting in suppressed side reactions and reduced loss of product. Propylene oxide is produced by oxidizing ethylbenzene in a liquid phase with molecular oxygen to a ... | 12/02/1997 |
| 5648573 | Compositions and methods for inhibiting vinyl aromatic monomer polymerization The polymerization of a vinyl aromatic monomer such as styrene is inhibited by the addition of a composition of a benzoquinone derivative and a hydroxylamine compound.... | 07/15/1997 |
| 5453167 | Separation of xylenes by extractive distillation p-Xylene cannot be separated from m-xylene by distillation or rectification because of the proximity of their boiling points. p-Xylene can be separated from m-xylene by means of extractive distillation. Effective agents are 3-ethylphenol and isopropyl pal... | 09/26/1995 |
| 5441608 | Separation of xylenes by extractive distillation p-Xylene cannot be separated from m-xylene by distillation or rectification because of the proximity of their boiling points. p-Xylene can be separated from m-xylene by means of extractive distillation. Effective agents are 3-ethylphenol and 1,1,2-trichlo... | 08/15/1995 |
| 5429720 | Solvent recovery from waste oils A distillation process for separating spent organic solvents such as trichloroethane or d-limonene from their contaminants such as oil is improved by the addition of a perfluorinated alkane or mixture of such alkanes to permit more efficient separation of... | 07/04/1995 |
| 5421964 | Process for separating HCl and halocarbons The present invention discloses an extractive distillation process for separating HCl from pentafluoroethane, chloropentafluoroethane, chlorotrifluoroethane, trifluoromethane, and other fully saturated and unsaturated fluorocarbons, chlorofluorocarbons an... | 06/06/1995 |
| 5399751 | Method for recovering carboxylic acids from aqueous solutions Disclosed is a method for recovering carboxylic acids having from one to ten carbon atoms, and particularly formic acid, acetic acid and mixtures of formic and acetic acids, from aqueous solutions, in which the aqueous solution is contacted with solvent c... | 03/21/1995 |
| 5399244 | Process to recover benzene from mixed hydrocarbons by extractive distillation Benzene and other aromatics are separated from a stream of mixed hydrocarbons containing both aromatics and non-aromatics by extractive distillation with a solvent system containing dimethyl sulfoxide and optionally a co-solvent, preferably water, followe... | 03/21/1995 |
| 5391263 | Process for the separation of glycols from dimethyl terephthalate Separation of ethylene glycol and diethylene glycol from dimethyl terephthalate is accomplished by distillation using methyl benzoate or the methyl ester of p-toluic acid as an azeotropic agent.... | 02/21/1995 |
| 5288370 | Process for the separation of butenes and butanes by extractive distillation For the separation of butenes and butanes by extractive distillation, a charge mainly containing butenes and butanes is contacted in an extractive distillation column under pressure with a first selective polar solvent, S1 (e.g., dimethyl formamide), the ... | 02/22/1994 |
| 5235117 | Process for the preparation of boric oxide by hydrolysis of methyl borate and its use in the oxidation of alcohol-saturated hydrocarbons For preparing at least one boric oxide in an anhydrous or hydrated form and of general formula B2 O3, xH2 O, in which x is a number from 0 to 3, a methyl borate hydrolyzate comprising boric oxide and methanol is introduced... | 08/10/1993 |
| 5232558 | Separation of 4-methyl-2-pentanone from formic acid by extractive distillation with DMSO 4-Methyl-2-pentanone cannot be easily separated from formic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from formic acid by extractive distillation. Typical effective agents are dimeth... | 08/03/1993 |
| 5228956 | Separation of 3-pentanone from formic acid by extractive distillation 3-Pentanone cannot be completely removed from 3-pentanone and formic acid mixtures by distillation because of the presence of the maximum azeotrope. 3-Pentanone can be readily removed from 3-pentanone-formic acid mixtures by extractive distillation in whi... | 07/20/1993 |
| 5227029 | Separation of formic acid from acetic acid by extractive distillation Formic acid cannot be easily removed from formic acid-acetic acid mixtures by distillation because of the closeness of their boiling points. Formic acid can be readily removed from mixtures containing it and acetic acid by extractive distillation. Typical... | 07/13/1993 |
| 5194122 | Method for recovering volatile, organic compounds from manure A method for recovering volatile, organic compounds from manure, by: i) acidifying and concentrating the manure; ii) condensing the formed vapor; and iii) separating the volatile, organic compounds from the condensate. Preferably the volatile, organic compounds are remo... | 03/16/1993 |
| 5194123 | Separation of 4-methyl-2-pentanone from acetic acid by extractive distillation with DMSO 4-Methyl-2-pentanone cannot be easily separated from acetic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from acetic acid by extractive distillation. Typical effective agents are dimeth... | 03/16/1993 |
| 5190619 | Separation of 3-methyl-2-butanone from formic acid by extractive distillation with DMSO 3-Methyl-2-butanone cannot be separated from formic acid by distillation because of the presence of the maximum boiling azeotrope. 3-Methyl-2-butanone can be readily removed from formic acid by extractive distillation using dimethylsulfoxide (DMSO). Typic... | 03/02/1993 |
| 5173156 | Dehydration of formic acid by extractive distillation Formic acid cannot be completely removed from formic acid--water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from mixtures containing it and water by using extractive distillation in which ... | 12/22/1992 |
| 5154802 | Separation of unsaturated hydrocarbons by extractive distillation The separation of alkadienes from close-boiling alkenes by extractive distillation employs as solvent either N-(ଲ-mercaptoethyl)-2-pyrrolidone alone, or a mixture of N-(ଲ-mercaptoethyl)-2-pyrrolidone and either N-methyl-2-pyrrolidone or c... | 10/13/1992 |
| 5151161 | Separation of olefinic hydrocarbons by extractive distillation The separation of alkadienes from close-boiling alkenes by extractive distillation employes as solvent N-methyl-2-thiopyrrolidone, alone or in admixture with unsubstituted sulfolane (cyclotetramethylene sulfone), or a mixture of unsubstituted sulfone and ... | 09/29/1992 |
| 5147512 | Separation of ketone isomers by extractive distillation The higher boiling ketone isomers are difficult to separate one from another by conventional distillation or rectification because of the close proximity of their boiling points. Ketone isomers can be readily separated from each other by extractive distil... | 09/15/1992 |
