GB907926A - Improvements in or relating to the production of trimellitic acid and trimellitic anhydride - Google Patents
Improvements in or relating to the production of trimellitic acid and trimellitic anhydrideInfo
- Publication number
- GB907926A GB907926A GB1333061A GB1333061A GB907926A GB 907926 A GB907926 A GB 907926A GB 1333061 A GB1333061 A GB 1333061A GB 1333061 A GB1333061 A GB 1333061A GB 907926 A GB907926 A GB 907926A
- Authority
- GB
- United Kingdom
- Prior art keywords
- trimellitic
- stage
- acid
- trimellitic acid
- production
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
- C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Furan Compounds (AREA)
Abstract
A process for the production of trimellitic acid comprises in a first stage oxidising pseudocumene in the liquid phase with a molecular oxygen containing gas in the presence as catalyst of a cobalt or manganese salt or mixtures thereof to form a partially oxidised mixture corresponding approximately to the formula C6H3(COOH)x(CHO3)3-x where x is within the range 1.3 to 1.8 and in a second stage oxidising the said mixture further to trimellitic acid by treatment with nitric acid at an elevated temperature. The trimellitic acid thus obtained may be dehydrated to give trimellitic anhydride by a heat treatment e.g. heating at 230-235 DEG C. The first stage oxidation is preferably carried out at 190-220 DEG C. in acetic acid solution using air as the oxidant and cobalt and/or manganese acetate, nitrate or naphthenate as catalyst. The nitric acid oxidation is preferably carried out under pressure at 180-85 DEG C. after the volatile components and diluent, if any, have been removed from the mixture. Examples are given.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2270160A | 1960-04-18 | 1960-04-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB907926A true GB907926A (en) | 1962-10-10 |
Family
ID=21810981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1333061A Expired GB907926A (en) | 1960-04-18 | 1961-04-13 | Improvements in or relating to the production of trimellitic acid and trimellitic anhydride |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB907926A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1916201B1 (en) * | 1969-03-29 | 1970-10-01 | Zieren Chemiebau Gmbh Dr A | Process for the production of pure trimellitic anhydride |
DE2144920A1 (en) * | 1970-09-08 | 1972-04-13 | ||
US4016206A (en) * | 1972-12-18 | 1977-04-05 | Gulf Research & Development Company | Process for preparing pyromellitic acid |
EP1398307A1 (en) * | 2002-09-11 | 2004-03-17 | Mitsubishi Gas Chemical Company, Inc. | Process for producing trimellitic acid |
-
1961
- 1961-04-13 GB GB1333061A patent/GB907926A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1916201B1 (en) * | 1969-03-29 | 1970-10-01 | Zieren Chemiebau Gmbh Dr A | Process for the production of pure trimellitic anhydride |
DE2144920A1 (en) * | 1970-09-08 | 1972-04-13 | ||
US4016206A (en) * | 1972-12-18 | 1977-04-05 | Gulf Research & Development Company | Process for preparing pyromellitic acid |
EP1398307A1 (en) * | 2002-09-11 | 2004-03-17 | Mitsubishi Gas Chemical Company, Inc. | Process for producing trimellitic acid |
US6835852B2 (en) | 2002-09-11 | 2004-12-28 | Mitsubishi Gas Chemical Company, Inc. | Process for producing trimellitic acid |
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