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:
May. 19, 1981
Filed:
Jul. 02, 1979
Makoto Komatsu, Kurashiki, JP;
Tazuo Ohta, Kurashiki, JP;
Toru Tanaka, Kurashiki, JP;
Ryoichi Oda, Kurashiki, JP;
Yuji Takamizawa, Kurashiki, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
Terephthalic acid of high purity is continuously produced in a high yield by oxidizing p-tolualdehyde with a molecular oxygen-containing gas in the presence of bromine ions as a catalyst in a water solvent, contacting the resulting slurry solution containing crude terephthalic acid with an ascending stream of high temperature water of 180.degree.-320.degree. C., and withdrawing the water solvent together with the ascending stream of high temperature of water upwardly, while settling down crystalline terephthalic acid through the ascending stream of high temperature water and withdrawing the crystalline terephthalic acid together with a portion of the high temperature water downwardly.