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Class Information
Number: 562/898
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Carboxylic acid anhydrides (i.e., compounds having the -c(=o)-o-c(=o)- group) > Purification or recovery
Description: Processes wherein the carboxylic acid anhydride is separated from impurities or from the reaction mixture.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6987201 |
Acetic anhydride, method of purifying crude acetic anhydride, and method of producing polyoxytetramethylene glycol using acetic anhydride |
Jan. 17, 2006 |
| 6469206 |
Process for the preparation of triflic anhydride |
Oct. 22, 2002 |
| 5801279 |
Method for removing iodine compounds contained in organic medium |
Sep. 1, 1998 |
| 5516735 |
Method for stabilizing rhodium compound |
May. 14, 1996 |
| 5502249 |
Process for the removal of iodine from acetyl compounds |
Mar. 26, 1996 |
| 5385875 |
Method for stabilizing rhodium compound |
Jan. 31, 1995 |
| 5362365 |
Purification of acetic anhydride or acetic anhydride and acetic acid using ozone |
Nov. 8, 1994 |
| 5300198 |
Process for the separation of ethylidene diacetate from acetic anhydride |
Apr. 5, 1994 |
| 5292948 |
Continuous process for the preparation of acetic anhydride or mixtures of acetic anhydride and acetic acid |
Mar. 8, 1994 |
| 5264087 |
Method for refining acetic anhydride by distillation |
Nov. 23, 1993 |
| 5244545 |
Process for removing acetone from carbonylation processes |
Sep. 14, 1993 |
| 5175363 |
Method for purification of carboxylic acids and anhydrides |
Dec. 29, 1992 |
| 5169982 |
Process for separating iodine and its compounds from the products obtained on subjecting dimethylether, methyl acetate or methanol to carbonylation |
Dec. 8, 1992 |
| 5097069 |
Process for decomposing .alpha.,.beta.-unsaturated carbonyl compounds in refining acetic anhydride and/or acetic acid |
Mar. 17, 1992 |
| 4945172 |
Preparation of N-formyl-L-aspartic anhydride |
Jul. 31, 1990 |
| 4908477 |
Removal of organic iodine compounds from carbonylation products of methanol methyl acetate and dimethyl ether |
Mar. 13, 1990 |
| 4792420 |
Purification of carboxylic acid anhydrides |
Dec. 20, 1988 |
| 4737318 |
Recovery of acetic anhydride |
Apr. 12, 1988 |
| 4664753 |
Process for separating iodine and its compounds from the carbonylation products obtained by subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction |
May. 12, 1987 |
| 4650615 |
Purification of carboxylic acid anhydrides contaminated with halogen or halides |
Mar. 17, 1987 |
| 4556644 |
Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether |
Dec. 3, 1985 |
| 4476238 |
Separation of tars from carbonylation reaction mixtures |
Oct. 9, 1984 |
| 4476237 |
Separation of tars from carbonylation reaction mixtures |
Oct. 9, 1984 |
| 4442304 |
Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether |
Apr. 10, 1984 |
| 4440570 |
Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether |
Apr. 3, 1984 |
| 4434240 |
Recovery of noble metal values from carbonylation residues |
Feb. 28, 1984 |
| 4434241 |
Catalyst recovery process from tar from carbonylation reactions |
Feb. 28, 1984 |
| 4388217 |
Process for the recovery of catalyst values |
Jun. 14, 1983 |
| 4364907 |
Process for recovery of rhodium values |
Dec. 21, 1982 |
| 4341741 |
Recovery of rhodium from carbonylation residues |
Jul. 27, 1982 |
| 4340570 |
Recovery of rhodium from carbonylation residues |
Jul. 20, 1982 |
| 4340569 |
Treatment of carbonylation residues |
Jul. 20, 1982 |
| 4246195 |
Purification of carbonylation products |
Jan. 20, 1981 |
| 4107002 |
Process for the purification of crude acetic anhydride |
Aug. 15, 1978 |
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