Title:
METHOD FOR ELECTROLYZING AQUEOUS SODIUM SULFATE SOLUTION
Document Type and Number:
Japanese Patent JP3196382
Kind Code:
B2
Abstract:
PURPOSE: To stably and efficiently electrolyze an aq. concd. sodium sulfate soln. of stabilized composition obtained from soda ash and/or sodium bicarbonate and aq. sulfuric acid without clogging the electrolytic cell and pipeline due to solid deposit, scaling, etc., without any trouble in the cell in the electrolysis using a gas diffusion electrode, without the cell being damaged by the generation of gaseous CO2 in the cell and with the electrolytic voltage hardly increased.
CONSTITUTION: An aq. sodium sulfate soln. is electrolyzed by the ion-exchange membrane process to produce sodium hydroxide. In this case, solid soda ash and/or sodium bicarbonate are brought into contact with aq. sulfuric acid at ≥30°C to obtain an aq. sodium sulfate soln. at ≥pH7. Sulfuric acid is added to the soln. to decrease the pH to ≤6, and the soln. is electrolyzed at ≥50°C. The soln. contains ≥20wt.% sodium sulfate, and a gaseous hydrogen diffusion electrode is preferably used as the anode.
Inventors:
Mitsuhisa Sakamoto
Application Number:
JP33616092A
Publication Date:
August 06, 2001
Filing Date:
December 16, 1992
Export Citation:
Assignee:
Tosoh Corporation
International Classes:
C25B1/16; C25B11/03; C25B15/08; (IPC1-7): C25B1/16; C25B11/03; C25B15/08
Domestic Patent References:
| JP6293986A | ||||
| JP6172558A | ||||
| JP6128779A |