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:
May. 28, 1996
Filed:
Nov. 25, 1994
Applicant:
Inventors:
Robert L Zeller, III, Youngstown, NY (US);
Walter M Opalinski, Tonawanda, NY (US);
Assignee:
Occidental Chemical Corporation, Niagara Falls, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G / ; C01D / ; C01D / ;
U.S. Cl.
CPC ...
423551 ; 423183 ; 423607 ; 210913 ;
Abstract
Disclosed is a process for making orthorhombic Na.sub.2 SO.sub.4 containing less than 0.1 ppm chromium from a solution of Na.sub.2 SO.sub.4 containing 0.1 to 100 ppm Cr(III). The Cr(III) is oxidized to Cr(VI) at a pH greater than 7, water is evaporated from the solution to precipitate the orthorhombic Na.sub.2 SO.sub.4, and the precipitated orthorhombic Na.sub.2 SO.sub.4 is separated from the solution.