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:
Oct. 19, 1976
Filed:
Jun. 16, 1975
Robert Wright Bragdon, Marblehead, MA (US);
Jon Carl Thunberg, Amherst, NH (US);
W. R. Grace & Co., New York, NY (US);
Abstract
An aqueous solution is prepared by: (a) admixing nitrilotriacetonitrile and aqueous hydrochloric acid to form a first mixture; (b) reacting the nitrilotriacetonitrile and the hydrochloric acid components of the first mixture at 25.degree.-70.degree. C to form a second mixture; and (c) adjusting the pH of the second mixture to about 3-7 by admixing the second mixture and sodium hydroxide, potassium hydroxide, or ammonia to form the aqueous solution. Said solution is useful for reducing the caking tendency of particulate sodium chloride. Said solution is also useful as an additive to systems in which potassium chloride is to be separated from sodium chloride by froth flotation. Said solution is also useful as an inhibitor for inhibiting the crystallization of sodium chloride from brines, including brines encountered in oil well operations.