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Class Information
Number: 203/15
Name: Distillation: processes, separatory > Distilling to separate or remove only water > From organic compound > Organic acid
Description: Processes in which the organic substance is an organic acid.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7569722 |
Process for removal of benzoic acid from an oxidizer purge stream |
Aug. 4, 2009 |
| 7435318 |
Ionic liquids as selective additives for separation of close-boiling or azeotropic mixtures |
Oct. 14, 2008 |
| 7410556 |
Purification of aqueous solutions of organic acids |
Aug. 12, 2008 |
| 7241365 |
Material for a facility for the production of anhydrous formic acid |
Jul. 10, 2007 |
| 6793777 |
Method for separating and purifying an aqueous mixture that mainly consists of acetic acid and formic acid |
Sep. 21, 2004 |
| 6695952 |
Method for the separation of and purification of an aqueous mixture consisting of the main components acetic acid and formic acid |
Feb. 24, 2004 |
| 6179966 |
Method for producing acrylic acid |
Jan. 30, 2001 |
| 5980696 |
Dehydration of acetic acid by azeotropic distillation in the production of an aromatic acid |
Nov. 9, 1999 |
| 5976324 |
Removal of water from reaction mixtures |
Nov. 2, 1999 |
| 5873981 |
Recovery of anhydrous acids |
Feb. 23, 1999 |
| 5624566 |
Method and apparatus for recovering carboxylic acids from dilute solutions |
Apr. 29, 1997 |
| 5603813 |
Purifying distillation of vinyl formate |
Feb. 18, 1997 |
| 5492625 |
Method of recovering carboxylic acids from dilute solutions |
Feb. 20, 1996 |
| 5399751 |
Method for recovering carboxylic acids from aqueous solutions |
Mar. 21, 1995 |
| 5384413 |
Process for the preparation of tetrafluorophthalic acid and/or tetrafluorophthalic anhydride |
Jan. 24, 1995 |
| 5312935 |
Purification of fluorinated carboxylic acids |
May. 17, 1994 |
| 5296639 |
Adipic acid purification |
Mar. 22, 1994 |
| 5206433 |
Preparation of formic acid |
Apr. 27, 1993 |
| 5173156 |
Dehydration of formic acid by extractive distillation |
Dec. 22, 1992 |
| 5154800 |
Dehydration of acrylic acid by extractive distillation |
Oct. 13, 1992 |
| 5104492 |
Recovery of carboxylic acids from water by precipitation from organic solutions |
Apr. 14, 1992 |
| 5059327 |
Cross-linked separation membrane and process for pervaporation |
Oct. 22, 1991 |
| 5006205 |
Dehydration of formic acid by extractive distillation |
Apr. 9, 1991 |
| 4978430 |
Method for dehydration and concentration of aqueous solution containing organic compound |
Dec. 18, 1990 |
| 4938846 |
Preparation of anhydrous alkanesulfonic acid |
Jul. 3, 1990 |
| 4935100 |
Dehydration of formic acid by extractive distillation |
Jun. 19, 1990 |
| 4898644 |
Removal of volatile acids from aqueous solutions |
Feb. 6, 1990 |
| 4877490 |
Dehydration of formic acid by extractive distillation with dicarboxylic acids |
Oct. 31, 1989 |
| 4838998 |
Process for separating sulfuric acid and carboxylic acids |
Jun. 13, 1989 |
| 4786370 |
Dehydration of formic acid by extractive distillation |
Nov. 22, 1988 |
| 4736062 |
Process for preparing methacrylic acid |
Apr. 5, 1988 |
| 4735690 |
Dehydration of impure formic acid by extractive distillation |
Apr. 5, 1988 |
| 4692219 |
Separation of formic acid from acetic acid by extractive distillation |
Sep. 8, 1987 |
| 4670105 |
Dehydration of propanoic acid by extractive distillation |
Jun. 2, 1987 |
| 4661208 |
Method for dehydrating distillation of an aqueous solution of carboxylic acid |
Apr. 28, 1987 |
| 4642166 |
Dehydration of formic acid by extractive distillation |
Feb. 10, 1987 |
| 4599144 |
Process for recovery of methacrylic acid |
Jul. 8, 1986 |
| 4576683 |
Method for separating carboxylic acids from mixtures with non-acids |
Mar. 18, 1986 |
| 4554054 |
Methacrylic acid separation |
Nov. 19, 1985 |
| 4518462 |
Distillation process for purifying methyl methacrylate |
May. 21, 1985 |
| 4450047 |
Process for recovering anhydrous alkanesulfonic acids by reduced pressure, falling film evaporation |
May. 22, 1984 |
| 4444881 |
Recovery of organic acids from a fermentation broth |
Apr. 24, 1984 |
| 4401514 |
Method for the recovery of furfural, acetic acid and formic acid |
Aug. 30, 1983 |
| 4365080 |
Production of dimethyl esters |
Dec. 21, 1982 |
| 4344897 |
Process for the preparation of percarboxylic acid solutions |
Aug. 17, 1982 |
| 4339596 |
Treatment of byproduct stream from adipic acid manufacture |
Jul. 13, 1982 |
| 4269666 |
Recovery of acrylic acid by reversal of acrylic acid/water relative volatility |
May. 26, 1981 |
| 4262140 |
Production of anhydrous or substantially anhydrous formic acid |
Apr. 14, 1981 |
| 4230887 |
Recovery of anhydrous acids |
Oct. 28, 1980 |
| 4076594 |
Purification of formic acid by extractive distillation |
Feb. 28, 1978 |
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