Chemistry: electrical and wave energy – Processes and products
Patent
1994-06-22
1995-06-13
Gorgos, Kathryn
Chemistry: electrical and wave energy
Processes and products
204104, C25B 116, C25B 122
Patent
active
054239591
ABSTRACT:
The present invention relates to an electrochemical process for the production of sulphuric acid and alkali metal hydroxide, from an aqueous anolyte containing alkali metal sulphate. According to the invention, crystalline alkali metal sulphate is added to the anolyte, whereby the concentration of water can be maintained below about 55 percent by weight. In the electrolysis, the anolyte is brought to an electrochemical cell with a cation exchange membrane. In the cell, sulphuric acid and oxygen are formed in the anode compartment and alkali metal hydroxide and hydrogen in the cathode compartment. The steps normally preceding the electrolysis, i.e. dissolution and purification of the sulphate can be disposed of, since the process is less sensitive to impurities than the processes of the prior art. The present invention also relates to an apparatus for the production of sulphuric acid and alkali metal hydroxide according to the invention.
REFERENCES:
patent: 4129484 (1978-12-01), Larsson
patent: 4391682 (1983-07-01), Struck et al.
patent: 4561945 (1985-12-01), Coker et al.
patent: 4770868 (1988-09-01), Norell
patent: 5091166 (1992-02-01), Engstrom et al.
patent: 5091167 (1992-02-01), Engstrom et al.
Sundblad Birgitta
Sundstrom Goran
Eka Nobel AB
Gorgos Kathryn
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