Process of producing sodium hydroxide from sodium sulphate in a pulp mill
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United States of America Patent
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-
Dec 30, 1997
Issued Date -
N/A
app pub date -
Jul 12, 1994
filing date -
Aug 20, 1991
priority date (Note) -
Expired
status (Latency Note)
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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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