FR2063874A5 - Trimellitic anhydrides from trimellitic acid - and acetic anhydride - Google Patents
Trimellitic anhydrides from trimellitic acid - and acetic anhydrideInfo
- Publication number
- FR2063874A5 FR2063874A5 FR7019374A FR7019374A FR2063874A5 FR 2063874 A5 FR2063874 A5 FR 2063874A5 FR 7019374 A FR7019374 A FR 7019374A FR 7019374 A FR7019374 A FR 7019374A FR 2063874 A5 FR2063874 A5 FR 2063874A5
- Authority
- FR
- France
- Prior art keywords
- trimellitic
- acetic anhydride
- anhydrides
- esp
- pref
- 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
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/56—Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/573—Separation; Purification; Stabilisation; Use of additives
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Furan Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
- Indole Compounds (AREA)
- Artificial Filaments (AREA)
Abstract
A mixture of the reactants, in the presence of benzene, is reacted at the b.pt. of the mixture (83-84 degrees C) at normal pressure. Pref. the benzene is used in a 6-fold esp a 2 to 3 fold excess over the trimellitic acid. Pref. the acetic anhydride is present in an excess of 10wt. % or more esp. 10-30 wt. % over the stoichiometric amount. The products high purity makes it valuable in the resin and plastics industry and for the prepn. of fibres and sheeting. The process is also useful in purifying trimellitic anhydride from other preparations, higher yields and purity are obtained.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19691943562 DE1943562C3 (en) | 1969-05-31 | Process for the purification of crude trimellitic anhydride |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2063874A5 true FR2063874A5 (en) | 1971-07-09 |
Family
ID=5743919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7019374A Expired FR2063874A5 (en) | 1969-05-31 | 1970-05-27 | Trimellitic anhydrides from trimellitic acid - and acetic anhydride |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2063874A5 (en) |
-
1970
- 1970-05-27 FR FR7019374A patent/FR2063874A5/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1943562B2 (en) | 1977-06-30 |
DE1943562A1 (en) | 1971-02-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |