Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1987-04-16
1989-02-07
Cintins, Ivars
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
210638, C25B 700, C25B 1300
Patent
active
048029661
ABSTRACT:
Disclosed herein is a method for treating a liquid used for absorbing gaseous sulfur dioxide in the wet process for desulfurization of a combustion exhaust gas of the gypsum-by-producing type, which method comprises the steps of, after subjecting a liquid, which has been saturated with gypsum, has dissolved at least magnesium sulfate and magnesium chloride and is used as the above-mentioned liquid for absorbing gaseous sulfur dioxide, to clarifying treatment, passing the liquid saturated with gypsum through an electrodialyzer having three dialyzing chambers comprising one sheet of cation-exchange membrane and two sheets of membrane selectively permeable to monovalent anions as one unit, thereby selectively separating and removing the chloride ion in the above-mentioned liquid as an aqueous solution of magnesium chloride of a high concentration.
REFERENCES:
patent: 3974258 (1976-08-01), Poitevin et al.
patent: 4337231 (1982-06-01), Yaguchi et al.
patent: 4367205 (1983-01-01), Kudo et al.
patent: 4636295 (1987-01-01), Ball et al.
Aoki Haruo
Kudo Yoshihiko
Cintins Ivars
Kureha Kagaku Kogyo Kabushiki Kaisha
White John P.
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