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. 11, 1993
Filed:
Aug. 22, 1991
Dewey W Fuller, Jr, Bristol, TN (US);
Bruce L Gustafson, Kingsport, TN (US);
Bobby L Bernard, Rogersville, TN (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Disclosed is an improved process for the preparation of phenylhydroquinone wherein hydroquinone is first alkylated with cyclohexene to produce cyclohexylhydroquinone which is then dehydrogenated to obtain phenylhydroquinone. The improvement comprises carrying out both the alkylation and dehydrogenation reactions in the presence of a solvent comprising diphenyl ether, biphenyl or a mixture thereof. The solvent possesses selective solubility for hydroquinone and cyclohexylhydroquinone which permits the separation of unreacted hydroquinone from the alkylation reaction product. The boiling point of the solvent also permits the dehydrogenation reaction to be performed at substantially atmospheric pressure.