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:
Jun. 01, 1976
Filed:
Sep. 25, 1974
Applicant:
Inventors:
Logan C Bostian, Virginia Beach, VA (US);
Charles E Winslow, Norfolk, VA (US);
Assignee:
Virginia Chemicals Inc., Portsmouth, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423181 ; 210 / ; 260542 ; 423182 ; 423514 ; 423515 ;
Abstract
Filtrate from a formate-sodium hydrosulfite preparation contains valuable amounts of sodium formate and sodium bisulfite, which are raw materials for the synthesis of sodium hydrosulfite. The filtrate also contains sodium thiosulfate which is a known catalyst for the decomposition of sodium hydrosulfite and, therefore, must not be introduced in with the raw materials. Accordingly the method concerns removing the sodium thiosulfate by means of ion exchange with a resin and directing the valuable sodium bisulfite and sodium formate effluent including methanol and water to a distillation column.