Process for the simultaneous removal of sulfur and mercury
AssigneeTDA Research, Inc.
InventorsGirish Srinivas, Robert J. Copeland
Life of this patent
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Abstract
A process for removing hydrogen sulfide, other sulfur-containing compounds and/or sulfur and mercury from a gas stream contaminated with mercury, hydrogen sulfide or both. The method comprises the step of selective oxidation of hydrogen sulfide (H2S) in a gas stream containing one or more oxidizable components other than H2S to generate elemental sulfur (S) or a mixture of sulfur and sulfur dioxide (SO2). The sulfur generated in the gas stream reacts with mercury in the gas stream to generate mercuric sulfide and sulfur and mercuric sulfide are removed from the gas stream by co-condensation.
Claims53
A method for simultaneous removal of hydrogen sulfide or other sulfur-containing compounds and mercury from a gas stream which comprises the steps of:
- a. contacting the gas stream containing hydrogen sulfide or other sulfur-containing compounds and mercury with a mixed metal oxide catalyst at a temperature equal to or less than about 400° C. in the presence of oxygen such that a substantial amount of the hydrogen sulfide or other sulfur-containing compounds present in the gas stream is oxidized to sulfur;
- and
- b. condensing the sulfur out of the gas stream whereby mercuric sulfide formed by interaction of the sulfur generated with mercury in the gas stream is also condensed with the sulfur,
- wherein the mixed metal oxide catalyst comprises a low oxidation activity metal oxide selected from the group consisting of titania, silica, zirconia, alumina and mixtures thereof and one or more higher oxidation activity metal oxides.
Dependencies are inferred from the claim text.