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:
Mar. 24, 1981
Filed:
Oct. 19, 1979
Mitsui Toatsu Chemicals, Inc., Tokyo, JP;
Abstract
An improved process for producing hydroquinone from p-isopropenyl phenol is disclosed. Hydroquinone is obtained by oxidizing p-isopropenyl phenol with hydrogen peroxide or an organic peroxide as an oxidizing agent at a temperature of 28.degree. to 50.degree. C. in the presence of a strong acid catalyst using a slightly or hardly water-soluble high-boiling polar solvent. In the oxidation reaction, the mole ratio of the oxidizing agent to p-isopropenyl phenol is kept at less than 1. After the reaction, in order to effectively decompose or consume the undecomposed p-isopropenyl phenol hydroperoxide and the unreacted oxidizing agent remaining in the reaction mixture, the reaction mixture is aged. Alternatively, or subsequently to the aging reaction, SO.sub.2 is added to the reaction mixture to completely decompose the undecomposed or unreacted peroxide. Thus, hydroquinone of high purity is obtained.