Chelate catalyst system for H.sub.2 S removal from a gas stream
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United States of America Patent
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Nov 14, 1989
Grant Date -
N/A
app pub date -
Nov 23, 1988
filing date -
Nov 23, 1988
priority date (Note) -
Expired
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Abstract
The present disclosure is directed to a process in solution for removing H.sub.2 S from a stream of natural gas. Sodium nitrite in the solution serves as an oxidizing agent for the H.sub.2 S. Buffering and defoaming agents are added. Absent a catalyst, the process suffers from conversion of the nitrite ion into NH.sub.3 which conversion is suppressed by the incorporation of a transition metal chelate complex. The metal is preferably chromium, copper or iron and the chelate complex is preferably EDTA or TEA, with acceptable performance obtained from HEEDTA or NTA. The metal chelate complex catalyzes the sodium nitrite oxidation of H.sub.2 S, markedly enhancing sulfur recovery as a precipitate in solution.
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