Removal of sulfides from gas streams with low-cost catalyst

Details Removal of sulfides from gas streams with low-cost catalyst Removal of sulfides from gas streams with low-cost catalyst

1989-03-13

1990-11-06

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423225, 423230, 423244, 4232451, 4235768, C01B 176, C01B 3120, B01J 800, C07C 1124

Patent

active

049685023

ABSTRACT:
The invention described herein discloses the use of silica gel as a catalyst for the efficient oxidation of hydrogen sulfide to elemental sulfur by nitric oxide. Concomitantly, this catalyst also promotes the hydrolysis of carbonyl sulfide to carbon dioxide and hydrogen sulfide, which then can be oxidized further by nitric oxide in the same reactor to produce elemental a sulfur. This process is designed for application in coal combustion and coal-gasification processes as a replacement for the presently available and practiced expensive methods and means for gas purification and catalytic liquid-phase conversion of these gases to sulfur. A principal advantageous feature of the instant invention is the fact that practice thereof alleviates or removes the heretofore restrictions and impediments imposed on such or similar techniques of the prior art in that the sulfur-containing pollutants from many gas stream efluents such as, for example, those emitted by the combustion of high-sulfur content fossil fuel comprising coal and/or oil, can be effectively and efficiently treated, without the need or requirement to substantially adjust or change the enthalpy of such gas stream, to thereby effect the desired cleaning treatment thereof.

REFERENCES:
patent: 1335348 (1920-03-01), Patrick et al.
patent: 1895724 (1933-01-01), Miller et al.
patent: 2083894 (1937-06-01), Connolly
patent: 4314977 (1982-02-01), Kulik
Pierce, J. A., J. Phys. Chemical, 1929, 33, 22-36.

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