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:
Aug. 17, 1976
Filed:
Apr. 29, 1974
Applicant:
Inventors:
Yataro Ichikawa, Iwakuni, JA;
Yoshiyuki Yamanaka, Iwakuni, JA;
Nobuo Suzuki, Iwakuni, JA;
Hideki Tsuruta, Iwakuni, JA;
Assignee:
Teijin Limited, Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
2605 / ; 203 91 ; 2605 / ;
Abstract
A process for recovering purified 4-hydroxy-2,4,6-trimethyl-2,5-cyclohexadiene-1-one by distilling crude 4-hydroxy-,2,4,6-trimethyl-2,5-cyclohexadien-1-one. Preferably, the distillation is performed at a temperature of 40.degree. to 250.degree.C. using crude 4-hydroxy-2,4,6-trimethyl-2,5-cyclohexadien-1-one having a pH of 4 to 11.5. Thus, 4-hydroxy-2,4,6-trimethyl-2,5-cyclohexadien-1-one of high purity and reduced coloration can be recovered at a high recovery ratio.