Reducing the consumption of anthraquinone disulfonate in stretfo

Details Reducing the consumption of anthraquinone disulfonate in stretfo Reducing the consumption of anthraquinone disulfonate in stretfo

1977-09-06

1982-02-16

Thomas, Earl C.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423226, 423471, C01B 1705, B01D 5334

Patent

active

043159036

ABSTRACT:
A process for treating a hydrogen sulfide-containing hydrogenated Claus process tail gas to convert the hydrogen sulfide to elemental sulfur in which said gas is contacted with an aqueous alkaline solution containing a water-soluble metal vanadate, a water-soluble anthraquinone disulfonate, and a water-soluble, inorganic fluoride, borate, or phosphate complexing agent to yield an effluent gas to reduced sulfur content. The solution is thereafter regenerated by contact with an oxygen-containing gas, elemental sulfur is recovered from the solution, and the regenerated solution is recycled to the gas-contacting step. The complexing agent contained in the solution reduces the chemical consumption of the anthraquinone disulfonate.

REFERENCES:
patent: 3752877 (1973-08-01), Beavan
patent: 3812243 (1974-05-01), Landrum et al.
patent: 3928535 (1975-12-01), Schulz
patent: 3959542 (1976-05-01), Espenscheid et al.
patent: 4060594 (1977-11-01), Fenton et al.
Nicklin, "Hydrogen Sulfide Removal by the Stretford Liquid Prrification Process," Institute of Gas Engineers, Publication No. 593, May 1961.
Moyes et al., "Development of the Holmes-Stretford Process," The Chemical Engineer, Feb. 1974, pp. 84-90.
Smith, "The Sequestration of Metals," Chapman and Hall, Ltd. London, 1959, pp. 106-109, 113.

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