Process of producing sodium hydroxide from sodium sulphate in a

Details Process of producing sodium hydroxide from sodium sulphate in a Process of producing sodium hydroxide from sodium sulphate in a

1994-07-12

1997-12-30

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 3011, 423207, D21C 1100, D21C 1104

Patent

active

057025703

ABSTRACT:
Sodium hydroxide is formed from sodium sulphate by a three step operation comprising converting the sodium sulphate to sodium sulphide, converting the sodium sulphide to sodium bicarbonate, and converting the sodium bicarbonate to sodium hydroxide. The operations preferably are effected in conjunction with a bleached kraft pulp mill operation, so as to utilize by-product sodium sulphate from chlorine dioxide generation to produce useful sodium hydroxide as sulphur without co-producing chlorine.

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