Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1978-12-26
1981-06-23
Vertiz, O. R.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423244, 423563, 423569, 423574G, 423415A, 423650, C01B 1700, C01B 3100, C01B 1702, C01B 113
Patent
active
042750440
ABSTRACT:
There is disclosed a multi-stage process for reducing sulfur dioxide to sulfur or to hydrogen sulfide whereby a hydrogen-containing gas from a high temperature gasifier is used. In the first stage of the process, the gasifier exit gas is contacted at a minimum temperature of about 1800.degree. F. with recycle gas containing SO.sub.2, H.sub.2 S, COS, mercaptans, and CS.sub.2 in order primarily to reduce the organic sulfur compounds, i.e., COS, mercaptans, and CS.sub.2, which heretofore would tend to accumulate in prior known methods employing a carbonaceous fuel for the reduction of SO.sub.2. Gas leaving the first stage is then sent to a second stage wherein SO.sub.2 from an external source is added. Reduction of sulfur dioxide occurs in the second stage at a temperature of about 2000.degree. F. minimum, with the surplus heat of reaction removed by the generation of steam. Gas leaves the second stage and is thereafter cooled with simultaneous generation of steam and selective condensation of sulfur vapor. After cleaning and compression, the residual sulfur compounds contained in the gas may be removed and may then be returned to the first stage of the process or else introduced to a known sulfur recovery process. The disclosed process can permit the production of a useful gas without the need for preheating reactants or supplemental steam generation. In addition, the release of sulfur compounds to the atmosphere is eliminated or reduced in an economical manner. A minimal amount of process steam is used on an overall basis, thereby minimizing the problems associated in prior methods with condensation of sulfur vapor or treatment of aqueous effluents.
REFERENCES:
patent: 3752877 (1973-08-01), Beavon
patent: 4041130 (1977-08-01), Mackles
patent: 4082519 (1978-04-01), Steiner
Heller Gregory A.
Koppers Company Inc.
MacKay Donald M.
Vertiz O. R.
Zeh, Jr. Herbert J.
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