Method of separating sodium hydroxide from white liquor
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United States of America Patent
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-
Apr 23, 1996
Grant Date -
N/A
app pub date -
Oct 18, 1994
filing date -
Oct 20, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a method of processing white liquor (3) obtained from the causticization step of a pulp mill, in which method 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 membrane 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 circulation of the pulp mill.
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