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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 3939183 B1

PDFFull Text
Date of Patent:
Feb. 17, 1976

Filed:

Oct. 05, 1973

Purification of maleic anhydride

Applicant:
Inventors:

John D Gardner, Richmond, CA (US);

John F Manning, Albany, CA (US);

Assignee:

Chevron Research Company, San Francisco, CA (US);

Attorneys:

Magdeburger; G. F.

Stoner, Jr.; John

De Jonghe; T. G.

Primary Examiner:

Natalie Trousof

Assistant Examiner:

Bernard I Dentz

Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603 / ; 2603467 ;
Abstract

A method for obtaining purified polycarboxylic anhydrides of good color stability which comprises combining and contacting a metal halide and P.sub.2 O.sub.5 or a perborate with the crude anhydride before final distillation of the crude anhydride. Preferred metal halides are alkaline earth and transition metal halides, with magnesium, calcium and iron chlorides being particularly preferred. The method is especially advantageously applied to maleic anhydride purification, especially maleic anhydride produced by butane oxidation.

Find Patent Forward Citations

Gardner, John. (1976). Purification of maleic anhydride (U.S. Patent No. 3939183). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/3939183

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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