Process for removal of hydrogen sulfide and hydrogen...

C - Chemistry – Metallurgy – 01 – B

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C01B 17/02 (2006.01) B01J 23/882 (2006.01) C01B 17/16 (2006.01)

Patent

CA 1088276

ABSTRACT An improved method for reducing the hydrogen sulfide and hydrogen polysulfide content of liquid sulfur, wherein, the liquid sulfur is brought into contact with a solid degradation catalyst con- sisting of alumina or a cobalt-molybdenum impregnated alumina at 250°F to 320°F, preferably 270-275°F, in the presence of a gaseous purge stream of air or oxygen enriched air. In addition to exhibiting a many fold increase in rate of reaction relative to the use of either the catalyst without a purge gas or the purge gas alone, the use of an oxygen containing purge gas (such as wet air) in combination with the catalyst (such as alumina) shows a significant improvement, when com- pared to the use of a dry nitrogen purge in combination with the cata- lyst under similar conditions, in the kinetics of both the conversion of the polysulfides to sulfide (rate constant of 0.611 for wet air vs. 0.409 for dry nitrogen at 300°F) and the removal of hydrogen sulfide from liquid sulfur (rate constant of 0.877 in wet air vs. 0.62 for dry nitro- gen at 300°F).

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