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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 |
| 7338579 | Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water, and methanol by distilling in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product contains substantially... | 03/04/2008 |
| 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 |
| 7164044 | Process for producing high purity trialkanolamine A process for producing a high purity trialkanolamine excelling in hue and having an APHA of not more than 40, characterizing by including producing a mixed alkanolamine by the reaction of an alkylene oxide with ammonia; removing low-boiling substances from the mixe... | 01/16/2007 |
| 7037412 | Method for preparing deodorized N-vinyl-2-pyrrolidone The invention provides a method for producing purified N-vinyl-2-pyrrolidone free of odorous components. The method is composed of distilling with a distillation column a liquid, which is formed by adding to an odorous components-containing liquid having a N-vinyl-2... | 05/02/2006 |
| 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 |
| 6787001 | Method for distilling (meth) acrylic acid solution A method for distilling a raw material liquid containing (meth)acrylic acid substantially free from azeotropic solvents, collected with a collection agent from a mixed gas obtained by gas phase catalytic oxidation reactions which includes feeding to a distillation c... | 09/07/2004 |
| 6582565 | Recovery of 3,4-epoxy-1-butene by extractive distillation Disclosed is a process for the recovery and purification of 3,4-epoxy-1-butene (epoxybutene) from mixtures comprising epoxybutene and aliphatic and aromatic hydrocarbons containing five to seven carbon atoms having boiling points between about 20° C. and... | 06/24/2003 |
| 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 |
| 6395141 | Separation of components from aromatic hydrocarbon mixtures thereof by extractive distillation A method of separating aromatic hydrocarbons and non-aromatic hydrocarbons, and aromatic hydrocarbons and naphtenes involves distilling a mixture of the components by an extractive distillation process in the presence of an extractive distillation solvent... | 05/28/2002 |
| 6315869 | Process for purification of perfluorovinyl ethers A perfluorovinyl ether of the formula: RfO(CF2 CFXO)n CF.dbd.CF2 (1) in which Rf is a perfluoralkyl group, X is a fluorine atom or a trifluoromethyl group, and n is a number of 0 to 20 containing impurities is purified by remo... | 11/13/2001 |
| 6179967 | Purification process of pentrafluoroethane A purification process of pentafluoroethane from a crude pentafluoroethane containing chloropentafluoroethane as a by-product by extractive distillation using an extracting reagent having a standard boiling point of from -10° C. to 100° C. and being sel... | 01/30/2001 |
| 6159346 | Inhibition of 141b decomposition Inhibition of the formation of unsaturated carbon compounds during the heating of 141b involving the addition of various inhibitors such as dialkylhydroxylamine and/or the use of a vessel made of a nickel alloy.... | 12/12/2000 |
| 6042697 | Separation of 9,11-Diene C18 fatty acid from 10,12-Diene C18 fatty acid by azeotropic distillation 9,11- Diene C18 fatty acid cannot be separated from 10,12-Diene C18 fatty acid by conventional rectification because of the proximity of their boiling points. 9,11-Diene C18 fatty acid can be readily separated from 10,12-Diene fatty acid by azeotropic dis... | 03/28/2000 |
| 6024841 | Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by extractive distillation 2-Methyl-1-butanol and 3-methyl-1-butanol are difficult to separate from 1 pentanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-butanol and 3-methyl-1-butanol can be easily separated from 1-pe... | 02/15/2000 |
| 6017423 | Separation of 3-methyl-2-pentenal from N-butanol by extractive distillation 3-Methyl-2-pentenal cannot be separated from n-butanol by conventioal rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol by extractive distillation. Effective agents are 1-methyl-2-p... | 01/25/2000 |
| 6015875 | Process for making acetals Acetals are produced from the reaction of aldehydes and alcohols, e.g. methylal by the reaction of methanol and formaldehyde, by the reaction in a reaction distillation column of the alcohol and aldehyde in the presence of a catalyst and the concurrent fr... | 01/18/2000 |
| 6004435 | Separation of cumene from 3-ethyl toluene by azeotropic distillation Cumene cannot be separated from 3-ethyl toulene by distillation because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are methyl salicylate, diethylene glycol butyl ether and 3-nitrotolue... | 12/21/1999 |
| 5993610 | Separation of ethyl acetate from ethanol by azeotropic distillation Ethyl acetate cannot be separated from ethanol by distillation or rectification because of the closeness of their boiling points. Ethyl acetate is readily separated from ethanol by azeotropic distillation. Effective agents are ethyl ether, methyl formate ... | 11/30/1999 |
| 5972172 | Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by extractive distillation 1,2,4-Trimethylbenzene is difficult to separate from 1,2,3-trimethylbenzene by conventional distillation or rectification because of the proximity of their boiling points. 1,2,4-trimethylbenzene can be readily separated from 1,2,3-trimethylbenzene by extr... | 10/26/1999 |
| 5972173 | Allyl alcohol purification Mixtures of allyl alcohol and n-propanol are separated by extractive distillation using propylene carbonate, N-methyl pyrrolidone or gamma-butyrolactone extractive distillation solvent.... | 10/26/1999 |
| 5961789 | Separation of t-amyl alcohol from n-butanol by extractive distillation T-Amyl alcohol cannot be separated from n-butanol by distillation or rectification because of the closeness of their boiling points. T-Amyl alcohol is readily separated from n-butanol by extractive distillation. Effective agents are dimethylsulfoxide, N.N... | 10/05/1999 |
| 5928478 | Separation of linoleic acid from linolenic acid by azeotropic distillation Linoleic acid cannot be separated from linolenic acid by distillation or rectification because of the closeness of their boiling points. Linoleic acid is readily separated from linolenic acid by azeotropic distillation. Effective agents are nonane, dimeth... | 07/27/1999 |
| 5908538 | Separation of T-amyl alcohol from 2- methyl-1 -propanol azeotropic distillation 2-Methyl-1-propanol cannot be separated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Methyl-1-propanol is readily separated from t-amyl alcohol by azeotropic distillation. Effective agents are bu... | 06/01/1999 |
| 5904815 | Separation of t-amyl alcohol from n-butanol by azeotropic distillation t-Amyl alcohol cannot be separated from n-butanol by distillation or rectification because of the closeness of their boiling points. t-Amyl alcohol is readily separated from n-butanol by azeotropic distillation. Effective agents are propyl acetate, tetrah... | 05/18/1999 |
| 5897750 | Separation of acetone from isopropanol-water mixtures by extractive distillation Acetone cannot be separated from a mixture of isopropanol and water because of the closeness of their boiling points. Acetone can be easily separated from isopropanol and water by extractive distillation. Effective extractive agents are 1-nitropropane, 3-... | 04/27/1999 |
| 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 |
| 5879517 | Method for separating 2-butanol from t-amyl alcohol using certain organic compounds as the agent in extractive distillation 2-Butanol cannot be sparated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from t-amyl alcohol by extractive distillation. Effective agents are butyl ether, benzyl ace... | 03/09/1999 |
| 5876569 | Separation of methyl ethyl ketone from ethanol by extractive distillation Methyl ethyl ketone cannot be separated from ethanol by distillation or rectification because of the closeness of their boiling points. Methyl ethyl ketone is readily separated from ethanol by extractive distillation. Effective agents are methyl benzoate,... | 03/02/1999 |
| 5840160 | Separation of 3-carene from limonene by extractive distillation 3-Carene is difficult to separate from limonene by conventional distillation or rectification because of the proximity of their boiling points. 3-Carene can be readily separated from limonene by extractive distillation. Effective agents are o-cresol, 2,6-... | 11/24/1998 |
| 5830324 | Controlled continuous purification of propylene oxide by extractive distillation In the continuous purification of a propylene oxide feedstock contaminated with water, methanol and acetone wherein an acetone buffer is established in the column, normal distillation conditions are maintained or restored during or after an upset by conti... | 11/03/1998 |
| 5800681 | Separation of ethanol, isopropanol and water mixtures by extractive distillation Ethanol, isopropanol and water cannot be separated from each other by distillation or rectification because of minimum azeotropes. They are readily separated by extractive distillation. Effective agents are: dimethylsulfoxide for ethanol, phenol for isopr... | 09/01/1998 |
| 5795447 | Separation of 2-butanol from isobutanol by extractive distillation 2-Butanol cannot be separated from isobutanol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from isobutanol by extractive distillation. Effective agents are propylene glycol propyl ether,... | 08/18/1998 |
| 5789629 | Separating 3-methyl-1-butanol from 1-pentanol using certain organic compounds as the agent in extractive distillation 3-Methyl-1-butanol is difficult to separate from 1-pentanol by conventional distillation or rectification because of the proximity of their boiling points. 2 Methyl-1-butanol can be easily separated from 1-pentanol by extractive distillation. Effective ag... | 08/04/1998 |
| 5779862 | Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by azeotropic distillation 2-Methyl-1-butanol and 3-methyl-1-butanol are difficult to separate from 1-pentanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-butanol and 3-methyl-1-butanol can be easily separated from 1-pe... | 07/14/1998 |
| 5776321 | Separation of t-amyl alcohol from 1-propanol by azeotropic distillation 1-Propanol cannot be separated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 1-Propanol is readily separated from t-amyl alcohol by azeotropic distillation. Effective agents are heptane, ethyl aceta... | 07/07/1998 |
| 5772853 | Separation of 1-propanol from t-amyl alcohol by extractive distillation 1-Propanol and t-amyl alcohol cannot be separated by distillation or rectification because of the closeness of their boiling points. 1-Propanol is readily separated from t-amyl alcohol by extractive distillation. Effective agents are dipentene, amyl aceta... | 06/30/1998 |
| 5763694 | Separating 3-methyl-1-butanol from 1-pentanol by azeotropic distillation 3-Methyl-1-butanol cannot be separated from 1-pentanol by distillation or rectification because of the closeness of their boiling points. 3-Methyl-1-butanol is readily separated from 1-pentanol by azeotropic distillation. Effective agents are methylcycloh... | 06/09/1998 |
| 5763695 | Separation of 3-methyl-1-butanol from 1-pentanol by extractive distillation 3-Methyl-1-butanol cannot be separated from 1-pentanol by distillation or rectification because of the closeness of their boiling points. 3-Methyl-1-butanol is readily separated from 1-pentanol by extractive distillation. Effective agents are butyl benzoa... | 06/09/1998 |
| 5759359 | Separation of 2-butanol from tert.amyl alcohol by azeotropic distillation 2-Butanol cannot be separated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from t-amyl alcohol by azeotropic distillation. Effective agents are methyl acetate, ethyl ... | 06/02/1998 |
