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:
Nov. 04, 1997
Filed:
Sep. 21, 1995
Applicant:
Inventors:
Gregory J Pomrink, Wyncote, PA (US);
Bruce K Fillipo, Dublin, PA (US);
Eric R Carver, Croydon, PA (US);
Paul R Burgmayer, Wayne, PA (US);
Assignee:
BetzDearborn Inc., Trevose, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
210698 ; 210699 ; 210750 ; 210757 ; 25218828 ; 25238953 ; 252396 ; 422 15 ; 422 17 ; 422 19 ;
Abstract
A method for stabilizing an aqueous solution containing sulfite or bisulfite ions and a water-soluble metal catalyst. The method comprises incorporating a stabilizing amount of a alpha substituted carboxylic acid or salt thereof or a vinyl carboxylic acid or salt thereof in the solution. The carboxylic acid inhibits sludge formation when the aqueous solution is stored. The preferred carboxylic acid, citric acid, also enhances the oxygen scavenging rate of the sulfite and bisulfite when the solution is used to treat aqueous systems for oxygen removal.