Process and apparatus for removal of H.sub.2 S from a process gas including polyvalent metal removal and decomposition of salts and complexes
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United States of America Patent
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Dec 1, 1992
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N/A
app pub date -
Dec 20, 1990
filing date -
Dec 20, 1990
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Expired
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Abstract
A method and apparatus for treating a catalytic polyvalent metal redox absorption solution, after absorption of H.sub.2 S from a gas, in a first hydrothermal treatment, to separate the polyvalent metal, for example as a polyvalent metal sulfide precipitate, and thereafter treating the redox solution in a higher temperature hydrothermal treatment to decompose thiosulfate salts and, if present, thiocyanide and other cyanide salts and metal-cyanide complexes to decompose the salts and complexes to molecules that can be treated in the H.sub.2 S-absorption process for recovery of sulfur and alkali values.
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