Process for removing sodium sulfate from aqueous buffer solutions
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United States of America Patent
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Apr 28, 1992
Grant Date -
N/A
app pub date -
Aug 22, 1990
filing date -
Feb 24, 1988
priority date (Note) -
Expired
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Abstract
Process for removing sodium sulphate from an aqueous citrate, adipate or phosphate buffer solution used for absorption of SO.sub.2 from exhaust gases, by evaporating an aqueous buffer solution at atmospheric pressure at a temperature near its boiling point, thereafter separating the precipitated sodium sulphate and optionally subjecting it to further treatment to recover accompanying buffer salt. The further treatment may consist in a treatment of the precipitated sodium sulphate together with accompanying buffer salt with water at elevated temperature. The solution which is then obtained is mixed with the rest of the buffer solution.
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