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| Number | Title | Issue Date |
| 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 |
| 7074304 | Process for purifying alicyclic alcohols A process for purifying alicyclic alcohols by distillation, wherein the alicyclic alcohols are distilled in the presence of from 1 to 550 ppm of acidic compounds. ... | 07/11/2006 |
| 6649205 | Solvent extraction There is described a process for the extraction of at least one relatively polar component from a material which may be naturally occuring or a synthetic mixture, the process comprising the steps of: (a) contacting the material with a solvent mixture comp... | 11/18/2003 |
| 6478929 | Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water and methanol by distilling the solution in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product... | 11/12/2002 |
| 6455087 | Solvent extraction There is described a process for the extraction of a least one relatively polar component form a material which may be naturally occurring or a synthetic mixture, the process comprising the steps of: (a) contacting the material with a solvent mixture comp... | 09/24/2002 |
| 6228226 | Process for working up crude, liquid vinyl acetate A process for working up crude, liquid vinyl acetate feed containing acetic acid, water and ethyl acetate and optionally smaller amounts of other impurities by distillation, wherein there is introduced into the distillation column, above the feed point of... | 05/08/2001 |
| 6207022 | Purification of crude (meth) acrylic acid Crude (meth)acrylic acid is purified by a process in which a primary amine compound and an organic sulfonic acid are added to the crude (meth)acrylic acid and the latter is then worked up by distillation.... | 03/27/2001 |
| 6019874 | Separation of conjugated linoleic acids by azeotropic distillation Conjugated linoleic acids cannot be separated by distillation or rectification because of the closness of their boiling points. Conjugated linoleic acids can be separated by azeotropic distillation. Effective agents are butyraldehyde, butyl ether and 1-me... | 02/01/2000 |
| 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 |
| 5846387 | On-site manufacture of ultra-high-purity hydrochloric acid for semiconductor processing Highly purified HCl for use in semiconductor manufacturing is prepared on-site by drawing HCl vapor from a liquid HCl reservoir, and scrubbing the filtered vapor in a low-pH aqueous scrubber.... | 12/08/1998 |
| 5785821 | Process for the production of acrylic acid The present invention provides an improved process for production of acrylic acid by subjecting propylene and/or acrolein to catalytic gas-phase oxidation with a molecular oxygen-containing gas. In the process, the mixed gas obtained by the catalytic gas-... | 07/28/1998 |
| 5720857 | Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by azeotropic distillation 1,2,4-Trimethylbenzene is difficult to sepparate from 1,2,3-trimethylbenzene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are 1-propanol, methyl formate and 1-nitropropane.... | 02/24/1998 |
| 5602294 | Separation of o-xylene from p-xylene and m-xylene by extractive 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 extractive distillation. Ef... | 02/11/1997 |
| 5582693 | Separation of 3-carene and limonene by azeotropic distillation 3-Carene and limonene cannot be separated from each other by rectification because of the closeness of their boiling points. They are readily separated by azeotropic distillation. Effective agents are: cyclopentanol, 2-nitropropane, ethyl formate amyl ace... | 12/10/1996 |
| 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 |
| 5262014 | Process for removing acetone from a mixture of acetone, methyl, acetate and methyl iodide A process for removing acetone from an acetone/methyl acetate/methyl iodide mixture utilizing extractive distillation with water being introduced to the distillation zone above the point of introduction of the mixture and acetic acid being introduced at o... | 11/16/1993 |
| 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 |
| 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 |
| 5152876 | Separation of methylene chloride from the lower alcohols by extractive distillation Methylene chloride cannot be completely separated from methanol or ethanol by conventional distillation or rectification because of the mimimum boiling azeotrope. Methyelne chloride can be readily separated from methanol or ethanol by azeotropic or extrac... | 10/06/1992 |
| 5143585 | Method of removing organic solvents An organic solvent having a boiling point lower than that of water is removed from liquid containig water and the organic solvent contained in a tank by exhausting air in the tank, wherein an air pressure in the tank is kept about vapor pressure level of ... | 09/01/1992 |
| 5100514 | Separation of pyridine from water by extractive distillation Pyridine cannot be completely separated from water by conventional distillation or rectification because of the minimum boiling azeotrope. Pyridine can be readily separated from water by using azeotropic or extractive distillation. Typical examples of eff... | 03/31/1992 |
| 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 |
| 5006205 | Dehydration of formic acid by extractive distillation Formic acid cannot be completely removed from formic acid and water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from formic acid - water mixtures by extractive distillation in which the ext... | 04/09/1991 |
| 4994151 | Separation of 4-methyl-2-pentanone from formic acid by extractive distillation with dimethylamides 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 using dimethylamides. Typical effect... | 02/19/1991 |
| 4969977 | Separation of 2-methyl-butanol-1 from pentanol-1 by extractive distillation 2-Methyl butanol-1 cannot be completely removed from 2-methyl butanol-1-pentanol-1 mixtures by distillation because of the proximity of their boiling points. 2-methyl butanol-1 can be readily removed from mixtures of these alcohols by using extractive dis... | 11/13/1990 |
| 4957595 | Separation of 3-methyl-2-butanone from formic acid by extractive distillation with sulfolane 3-Methyl-2-butanone cannot be separated from formic acid by distillation because of the presence of the maximum boiling azotrope. 3-Methol-2-butanoe can be readily removed from formic acid by extractive distillation using sulfolane. Typical effective agen... | 09/18/1990 |
| 4948471 | Separation of 4-methyl-2-pentanone from formic or acetic acid by extractive distillation with sulfolane 4-Methyl-2-pentanone cannot be easily separated from formic acid or acetic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from formic acid or acetic acid by extractive distillation. Typic... | 08/14/1990 |
| 4948469 | Separation of formic acid from dioxane by extractive distillation with amides Dioxane cannot be completely removed from dioxane and formic acid mixtures by distillation because of the presence of the maximum azeotrope. Dioxane can be readily removed from dioxane - formic acid mixtures by extractive distillation in which the extract... | 08/14/1990 |
| 4939294 | Preparation of ultra high purity methyl acetate In a process for the production of methyl acetate from methanol and glacial acetic acid involving countercurrently flowing acetic acid and methanol through a single reactive distillation column having an extractive distillation section and a methyl acetat... | 07/03/1990 |
| 4935100 | Dehydration of formic acid by extractive distillation Formic acid cannot be completely removed from formic acid and water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from formic acid - water mixtures by extractive distillation in which the ext... | 06/19/1990 |
| 4935103 | Separation of n-propanol from t-amyl alcohol by extractive distillation n-Propanol and t-amyl alcohol cannot be separated from each other by distillation because of the proximity of their boiling points. n-Propanol can be readily separated from t-amyl alcohol by using extractive distillation in which the extractive agent is a... | 06/19/1990 |
| 4925533 | Separation of vinyl acetate from ethyl acetate by extractive distillation with acids or acid amides Vinyl acetate cannot be easily removed from ethyl acetate by distillation because of the closeness of their boiling points. Vinyl acetate can be readily separated from ethyl acetate by means of extractive distillation. Typical effective agents are formic ... | 05/15/1990 |
| 4909907 | Separation of formic acid from acetic acid by extractive distillation with acetyl salicylic acid Formic acid cannot be easily removed from acetic acid by distillation because of the closeness of their vapor pressures. Formic acid can be readily removed from acetic acid by extractive distillation. Typical extractive distillation agents are acetyl sali... | 03/20/1990 |
| 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 |
| 4877490 | Dehydration of formic acid by extractive distillation with dicarboxylic acids Formic acid cannot be completely removed from formic acid and water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from formic acid--water mixtures by extractive distillation in which extracti... | 10/31/1989 |
| 4865973 | Process for extractive fermentation A process for producing a variety of chemical products, e.g., ethanol, by fermentation in which the product is removed from the fermentation medium as it is formed by liquid-liquid extraction using an extractant for the product which is immiscible with wa... | 09/12/1989 |
