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:
Sep. 05, 1978
Filed:
Jan. 16, 1978
Edward Norbert Nowak, Uniontown, OH (US);
William Shepherd Hollingshead, Cuyahoga Falls, OH (US);
The Goodyear Tire & Rubber Company, Akron, OH (US);
Abstract
Hydroquinone is obtained in greater than 95 percent yield through a nonaqueous recovery process compatible with the methyl isobutyl ketone (MIBK) based diisopropylbenzene dihydroperoxide isolation process. Hydroquinone, from the Hock-splitting reaction, is precipitated (after most of the reaction solvent is distilled off), separated, repulped in acetone, crystallized and separated again. The supernatant from the first separation step contains hydroquinone along with tars. This stream is subjected to a purification process comprising a series of distillation and extraction steps so that the hydroquinone in that stream can be recycled back into the process.