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:
Jul. 29, 1980
Filed:
Oct. 27, 1978
Applicant:
Inventor:
Richard E Bockrath, Wilmington, DE (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568706 ; 568708 ;
Abstract
A process for preparing alkali metal salts of para-nitrophenol by contacting para-chloronitrobenzene with an aqueous solution of (1) aqueous caustic and (2) recycled filtrate and washing solution from the preparation of para-nitrophenol containing 5-20% by weight of said alkali metal salts at a temperature of from 180.degree.-250.degree. C. and at autogenous pressure in 30 seconds to 10 minutes with the mole ratio of caustic to chloronitrobenzene of from 2:1-4:1, caustic concentration in the aqueous solution of from 5-20%, the amount of recycle ranging from 5-45% by weight based on the aqueous solution.