Method of separating sodium hydroxide from white liquor

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

D - Textiles, Paper

21

C

D21C 11/00 (2006.01) D21C 11/02 (2006.01) D21C 11/04 (2006.01)

Patent

CA 2118464

The present invention relates to a method of processing white liquor (3) obtained from the causticization step of a pulp mill, in which method the infeed white liquor (3) principally contains sodium hydroxide (6) and sodium sulfide (7). The method according to the invention is characterized in that the sodium hydroxide (6) contained in the white liquor (3) is separated from the white liquor (3) 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 (3) is advantageously entirely returned back to the chemical circula- tion of the pulp mill.

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