Process for the manufacture of sodium hydroxide

Details Process for the manufacture of sodium hydroxide Process for the manufacture of sodium hydroxide

1993-03-08

1994-05-03

Niebling, John

Chemistry: electrical and wave energy

Processes and products

2041824, 204301, B01D 6144

Patent

active

053084551

ABSTRACT:
Process for the manufacture of sodium hydroxide, according to which an electrodialysis cell is used, water or an aqueous sodium hydroxide solution (10, 10') is introduced into a chamber (6, 6') of the cell, defined between a cationic membrane (2, 2') and an anionic face (8, 8') of a bipolar membrane (3, 3'), an aqueous sodium carbonate solution (11, 11') is introduced into a chamber (7, 7') defined between a cationic face (9, 9') of the bipolar membrane (3, 3') and another cationic membrane (2', 2"), an alkaline pH is maintained in the chamber (7, 7') which is supplied with the sodium carbonate solution (11, 11') and an aqueous sodium hydroxide solution (12, 12') is drawn off from the chamber (6, 6') containing the anionic face (8, 8') of the bipolar membrane (3, 3').

REFERENCES:
patent: 4049519 (1977-09-01), Sloan
patent: 4238305 (1980-12-01), Gancy
patent: 4584077 (1986-04-01), Chlanda et al.

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