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:
Sep. 23, 1986
Filed:
Apr. 26, 1984
Applicant:
Inventors:
Heinz Kau, Kriftel, DE;
Jurgen Russow, Kelkheim, DE;
Assignee:
Hoechst Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25B / ; C25B / ;
U.S. Cl.
CPC ...
204 98 ; 204104 ; 2041824 ;
Abstract
A process is described for increasing the sulfuric acid concentration of solutions containing an alkali metal sulfate, sulfuric acid and alkaline earth metal ions. The solutions to be worked up are introduced into the anode compartment of an electrolysis cell. The anode compartment and the cathode compartment of the cell are each bounded by a cation exchange membrane. A center chamber is located between the two membranes. This center chamber is filled with an aqueous solution containing alkali metal ions. The concentration of alkaline earth metal ions in the solution in the center chamber must be kept below 5 mg/l during the electrolysis.