Process for recovery of sulfur from SO.sub.2 -containing gas

Details Process for recovery of sulfur from SO.sub.2 -containing gas Process for recovery of sulfur from SO.sub.2 -containing gas

1981-11-02

1984-01-31

Heller, Gregory A.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423574R, 422110, 422111, 436119, C01B 1704

Patent

active

044289219

ABSTRACT:
A process for recovery of sulfur from SO.sub.2 -containing gas which comprises the steps of supplying said SO.sub.2 -containing gas mixed with additional oxygen to a SO.sub.2 reduction reactor filled with solid carbonaceous materials for reducing part of the SO.sub.2 into H.sub.2 S, a vaporous sulfur and COS; separating said vaporous sulfur by condensation from an effluent gas coming from this SO.sub.2 reduction reactor to thereby produce a first gaseous mixture; supplying this first gaseous mixture to a Claus reactor to further produce a vaporous sulfur by Claus reaction; separating said vaporous sulfur by condensation from an effluent gas coming from this Claus reactor to thereby produce a second gaseous mixture; measuring the concentrations of SO.sub.2 and H.sub.2 S in this second gaseous mixture and further the concentration of COS as occasion demands; and controlling the amount of oxygen supplied to the SO.sub.2 - containing gas introduced into said SO.sub.2 reduction reactor in accordance with said measured concentrations, thereby maintaining the H.sub.2 S/SO.sub.2 molar ratio or (H.sub.2 S+COS)/SO.sub.2 molar ratio of said first gaseous mixture at a level of about 2.

REFERENCES:
patent: Re28864 (1976-06-01), Andral et al.
patent: 3904370 (1975-09-01), Robison
patent: 3985864 (1976-10-01), Vautrain et al.
patent: 4341753 (1982-07-01), Mori et al.

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