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| Number | Title | Issue Date |
| 7371309 | Purification of difluoromethane by extractive distillation The present invention provides extractive distillation processes for removing difluoromethane (HFC-32) from a mixture comprising HFC-32 and at least one of chlorodifluoromethane (CFC-12), 1,1,1-trifluoroethane (HFC-143a), chloropentafluoroethane (CFC-115), and penta... | 05/13/2008 |
| 7301055 | Process for removing methanol from formaldehyde-containing solutions Process for removing methanol from formaldehyde-containing solutions. The present invention relates to a process for removing methanol from formaldehyde-containing solutions, with methanol being converted into formaldehyde dimethyl acetal by reactive distillation in... | 11/27/2007 |
| 7285187 | Method of purifying propylene oxide A process for purifying propylene oxide characterized by subjecting a liquid reaction mixture containing propylene oxide, and water, hydrocarbons and oxygen-containing organic compounds as impurities obtained by reacting cumene hydroperoxide with propylene to extrac... | 10/23/2007 |
| 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 |
| 7182841 | Purification of solvents used for the purification of alkylene oxide This invention concerns a process for removing carbonyl-containing impurities from impure extractive distillation solvent such as a glycol, comprising: contacting the impure extractive distillation solvent with an acidic ion exchange resin. The purified extractive d... | 02/27/2007 |
| 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 |
| 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 |
| 6191285 | Process for the preparation of ketorolac tromethamine The present invention provides an improved process for producing ketorolac tromethamine. The preferred method utilizes a three-part solvent system, comprising isopropanol, ethyl acetate and water.... | 02/20/2001 |
| 6045808 | Method for removing high boiling solvents from drug formulations by vacuum drying A method for removing a high boiling solvent from a pharmaceutical composition dissolved in the high boiling solvent comprising adding a low boiling co-solvent to the solution to form a mixture of the high boiling solvent and the low boiling co-solvent, a... | 04/04/2000 |
| 6004434 | Method of recycling cleaning solvent A method of treating cleaning solvent used to clean mechanical parts. The method includes adding to the cleaning solvent a treating composition selected from the group of C5 -C14 alcohols, C2 -C8 dials, C10... | 12/21/1999 |
| 5863391 | Purification of a methanol stream Acetaldehyde may be effectively removed from a contaminated methanol stream using a distillation method wherein a solvent stream containing a relatively heavy polar compound such as water or propylene glycol is utilized as an extractive distillation solve... | 01/26/1999 |
| 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 |
| 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 |
| 5628880 | Etherification--hydrogenation process A process for removing dienes from etherification uses a hydrogenation zone in the reactor distillation column above the etherification zone. MTBE is produced and the unreacted C4 stream is also subjected to selective hydrogenation of the butad... | 05/13/1997 |
| 5562863 | Methods and compositions for inhibiting vinyl aromatic monomer polymerization Vinyl aromatic monomer polymerization methods utilizing a composition of 2,6-di-tert-butyl-4-methylphenol and a substituted benzoquinonediimide compound are disclosed. Preferably, the composition is employed in an amount of 1 part to 10,000 parts per mill... | 10/08/1996 |
| 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 |
| 5470440 | Method for inhibiting vinyl aromatic monomer polymerization Vinyl aromatic monomer polymerization methods utilizing a composition of 2,6-di-tert-butyl-4-methylphenol and a substituted benzoquinonediimide compound are disclosed. Preferably, the composition is employed in an amount of 1 part to 10,000 parts per mill... | 11/28/1995 |
| 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 |
| 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 |
| 5340446 | Purification of propylene oxide by cosolvent extractive distillation An extractive distillation agent consisting essentially of a mixture of triethylene glycol with a lower boiling cosolvent selected from the group consisting of 2-methyl-2,4-pentanediol, tertiary butyl alcohol and ethylene glycol is fed to an extractive di... | 08/23/1994 |
| 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 |
| 5238541 | Process for production of an ether-rich additive A process for the production of an ether-rich additive for gasoline, and more particularly, the production of TAME from light hydrocarbon streams by admixing the light hydrocarbon stream, preferably from an FCC feedstock, prior to distillation of the feed... | 08/24/1993 |
| 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 |
| 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 |
| 5178735 | Process for the supercritical extraction and separation of solid samples A method of extracting and separating substances contained in a solid sample, especially from ginkgo leaves, which comprises introducing a supercritical fluid into a dispersion in which the solid sample is dispersed, separating the supercritical fluid con... | 01/12/1993 |
| 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 |
| 5135617 | Separation of aromatic from olefinic hydrocarbons by extractive distillation Aromatic hydrocarbons containing 6-10 carbon atoms per molecule are separated from close-boiling olefinic hydrocarbons by extractive distillation employing N-(ଲ-hydroxyethyl)-2-pyrrolidone and/or cyclohexanol as solvent.... | 08/04/1992 |
| 5106459 | Separation of p-menthane from p-cymene by extractive distillation p-Cymene and p-menthane are difficult to separate one from another by conventional distillation or rectification because of the close proximity of their boiling points. p-Cymene and p-menthane can be readily separated one from another by using azeotropic ... | 04/21/1992 |
| 5100515 | Separation of alkenes from close-boiling alkanes An extractive distillation process for separatin at least one C4 -C10 alkene (monoolefin) from at least one close-boiling alkane employs a solvent mixture of (a) at least one saturated alcohol (preferably cyclohexanol) and either (b1... | 03/31/1992 |
| 5094723 | Separation of m-xylene from p-xylene or o-xylene by extractive distillation with alcohols m-Xylene is difficult to separate from p-xylene or o-xylene by conventional distillation or rectification because of the close proximity of their boiling points. m-Xylene can be readily separated from p-xylene or o-xylene by using extractive distillation ... | 03/10/1992 |
| 5092965 | Separation of 4-methyl-2-pentanone from acetic acid by extractive distillation with DMFA 4-Methyl-2-pentanone cannot be easily separated from acetic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-phentanone can be readily removed from acetic acid by extractive distillation. Typical effective agents are dimet... | 03/03/1992 |
| 5085740 | Separation of alkenes from alkanes An extractive distillation process for separating at least one C4 -C10 alkene (monoolefin) from at least one close-boiling alkane (paraffin) employs as solvent a mixture of (a) at least one N-alkyl-2-pyrrolidone, preferably N-methyl-... | 02/04/1992 |
| 5069756 | Separation of cyclohexane from cyclohexene by azeotropic or extractive distillation Cyclohexane cannot be readily separated from cyclohexene by conventional distillation or rectification because of the close proximity of their boiling points. Cyclohexane can be separated from cyclohexene by azeotropic or extractive distillation. Typical ... | 12/03/1991 |
| 5055162 | Extractive distillation of cycloalkane/alkane feeds Cycloalkanes, preferably cyclohexane and/or cyclopentane, are separated from close-boiling alkanes by extractive distillation employing as solvent a mixture of (a) at least one N-hydroxyalkyl-2-pyrrolidone, preferably N-(ଲ-hydroxyethyl)-2-pyrrolidon... | 10/08/1991 |
