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.:
Date of Patent:
Apr. 08, 2003
Filed:
May. 24, 2000
Akira Yamashita, Arai, JP;
Mitsuhiro Kouno, Arai, JP;
Daicel Chemical Industries, Ltd., Osaka, JP;
Abstract
The invented process for producing sorbic acid includes the step of decomposing a polyester at temperatures of 100° C. or less with hydrochloric acid, which polyester is obtained from ketene and crotonaldehyde. In the process, the reaction temperature after the initiation of a polyester decomposition reaction is controlled by adding a hydrochloric acid to a reaction mixture, which hydrochloric acid has a temperature lower than that of the reaction mixture, for example, a temperature of 50° C. or less. Such hydrochloric acid for reaction control may have a concentration of, for example, 23% by weight or more. This process can yield sorbic acid in a short time in a high yield and can highly efficiently produce sorbic acid.