Treating remains containing sodium chloride and sodium sulphate

Details Treating remains containing sodium chloride and sodium sulphate Treating remains containing sodium chloride and sodium sulphate

1975-09-19

1976-12-21

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, 210 65, 210 66, 210 67, 210 73R, C25B 116, C25B 126, B01D 100

Patent

active

039987094

ABSTRACT:
Method of dissolving out a sodium sulphate component of a residual product obtained upon evaporation and cooling of a sodium hydroxide solution originating from a diaphragm electrolysis, the product occuring in form of a crystallized salt mixture containing sodium chloride and sodium sulphate. First of all residues of the sodium hydroxide are removed from the product. Thereafter the mixture of sodium chloride and sodium sulphate is so slurried in water and treated that a maximum of the sodium chloride and a first part of the sodium sulphate are dissolved up to a solution being saturated of said two components while a second part of the sodium sulphate and a possible rest of the sodium chloride remain suspended. Whereafter the suspended solid substance is then separated from the sodium chloride-sodium sulphate mother brine.

REFERENCES:
patent: 2863809 (1958-12-01), Svanoe
patent: 3017245 (1962-01-01), Goodenough
Handbook of Chem. & Physics, pp. 568-569, 574-575.

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