Controlled temperature purification of aqueous sodium hydroxide solution
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United States of America Patent
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Feb 17, 1981
Grant Date -
N/A
app pub date -
Jun 13, 1979
filing date -
Jun 13, 1979
priority date (Note) -
Expired
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Abstract
Methods and apparatus are disclosed for enhanced purification of caustic soda solutions. In place of conventional mechanical separators, flotation separation methods are taught utilizing sequential multi-temperature sparging gas treatments. A first stage treatment, at about 70.degree. F.-90.degree. F., provides separation of sodium chloride and a subsequent stage, higher temperature (about 90.degree. F.-100.degree. F.) treatment provides enhanced removal of suspended sodium sulfate. Sensible heat is added to sparging gas to offset the cooling effect of gas expansion in a treatment tank and avoid crystallization of dissolved impurities from saturated solutions on sparging gas nozzles.
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