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:
Jan. 27, 1976
Filed:
Jan. 17, 1975
Applicant:
Inventor:
Nicholas P Greco, Edgewood, PA (US);
Assignee:
Koppers Company, Inc., Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2606 / ; 2606 / ; 260625 ;
Abstract
Hydroquinone is made by contacting nitrobenzene in an aqueous acid medium with hydrogen at elevated temperatures and pressures in the presence of an acid resistant reducing catalyst until hydrogen absorption ceases, removing any unreduced nitrobenzene from the reaction medium, removing the catalyst from the reaction medium, thereafter maintaining the reaction medium containing the hydrogen reduction product at a temperature of 200.degree. to 300.degree.C. for a sufficient time to hydrolyze the reduction product to hydroquinone, and extracting the hydroquinone from the aqueous reaction medium.