Method of producing sodium hydroxide from white liquor

Details Method of producing sodium hydroxide from white liquor Method of producing sodium hydroxide from white liquor

D - Textiles, Paper

21

C

D21C 11/00 (2006.01) C01B 17/34 (2006.01) C01D 1/38 (2006.01) D21C 11/02 (2006.01) D21C 11/04 (2006.01)

Patent

CA 2118463

The present invention relates to a method at processing white liquor obtained from the causticization stage of a pulp mill. According to the method, the white liquor, which principally contains sodium hydroxide (6) and sodium sulfide, is oxidized into polysulfide liquor (3), whereby the sodium sulfide is oxidized most advantageously with the help of a catalyst and an oxidizer such as air substantially into sodium poly-sulfide (7) and sodium thiosulfate. The method according to the invention is characterized in that the sodium hydroxide (6) contained in the white liquor is separated from the white liquor prior to the oxidizing step or from the polysulfide liquor (3) after the oxidizing step either entirely or partly by means of a diffusion dialysis process (4). The invention is further characterized in that the sodium hydroxide (6) separated from the white liquor is returned to the chemical circulation of the pulp mill.

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