Process for treating gas containing hydrogen sulfide and sulphur

Details Process for treating gas containing hydrogen sulfide and sulphur Process for treating gas containing hydrogen sulfide and sulphur

1997-09-16

1999-08-10

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

4235741, 4235762, 4232422, B01D 5350, B01D 5352

Patent

active

059355476

ABSTRACT:
In a process for treating a gas containing hydrogen sulphide and sulphur dioxide, such as Claus plant tail gas, to substantially reduce emission of sulphur vapor in the treated gases, the process a characterized in that the gas is brought into contact with a solvent (5) in at least one gas-liquid reactor-contactor (2) and a gas (20) is recovered which is sent to a second reactor (102) where it is brought into contact with solvent (105), the solvent (105) being cooled by suitable means (190), to separate a portion of the sulphur from the solvent. The resultant solvent depleted in sulphur, contacts the gas (20) from the first reactor (2). The gas (120) from the second reactor is highly depleted in sulphur vapor. At least one of the reactors contains a catalyst. The solvent may be insoluble in water, e.g. dodecane, tridecane, naphtha, or soluble in water, e.g. glycerol, thiodiglycol, cyclohexanedimethylethanol, or an acid ester. The catalyst may comprise, e.g., alkaline salts of organic acids such as benzoic acid or salicylic acid.

REFERENCES:
patent: 2881047 (1959-04-01), Townsend
patent: 3598529 (1971-08-01), Deschamps et al.
patent: 3796796 (1974-03-01), Deschamps et al.
patent: 3832454 (1974-08-01), Renault et al.

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