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. 22, 1991
Filed:
Jul. 10, 1989
Applicant:
Inventors:
Earl G Adams, Grand Bay, AL (US);
Arthur C Bayer, Ocean Springs, MS (US);
Alan D Farmer, Biloxi, MS (US);
Brenda J Hook, Gautier, MS (US);
Assignee:
First Chemical Corporation, Pascagoula, MS (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
210710 ; 210909 ;
Abstract
A process of selectively recovering a nitrophenolic by-product, namely 2,4-dinitrophenol and picric acid, from nitration waste water in substantially pure form through the control of the solution pH of the nitration waste water and subsequent precipitation is provided. By adjusting the solution pH of the nitration waste water with an acid to a pH in the range of from about 4.0 to 0.5, the solubility of the selected nitrophenolic by-products is affected and the crystal formation of the individual by-products controlled.