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:
Dec. 07, 1976
Filed:
Dec. 09, 1975
Applicant:
Inventors:
Charles A Gray, Princeton, NJ (US);
Sidney Berkowitz, Highland Park, NJ (US);
James Lawrence Manganaro, East Windsor, NJ (US);
Assignee:
FMC Corporation, Philadelphia, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602 / ;
Abstract
Waste digester liquor, containing dissolved triazines, ammonium salts and iron, is treated with a mineral base until the pH is about 2.5 to 4 whereby triazines are precipitated while most of the iron remains dissolved. The triazines are separated and recycled back to the digester. The pH of the filtrate is increased to about 11 and the ammonia stripped off and recovered leaving an essentially nitrogen free aqueous solution. This can be sewered directly or concentrated to recover the salts.