Treatment of spent caustic refinery effluents
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United States of America Patent
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May 8, 2007
Grant Date -
Mar 4, 2004
app pub date -
Sep 4, 2002
filing date -
Sep 4, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the methods for treatment of caustic effluents described in the specification, a spent caustic refinery effluent is supplied to a submerged combustion gas evaporator in which hot combustion gas containing carbon dioxide is injected into the caustic liquid to concentrate the liquid and convert a hydroxide constituent to a carbonate. Where the caustic effluent is from a petroleum refinery, oil in the waste liquid is separated from the aqueous constituent before, during or after concentration.
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