Process for removing sulfur dioxide from off-gas

Details Process for removing sulfur dioxide from off-gas Process for removing sulfur dioxide from off-gas

1985-04-08

1986-03-25

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423166, C01B 1700

Patent

active

045782571

ABSTRACT:
Disclosed is an improvement in a process for desulfurization of off-gas, which process comprises contacting an off-gas which contains sulfur dioxide with an absorbing solution containing at least a sulfosuccinate, a sulfate and a crystalline gypsum to absorb the sulfur dioxide for removal therefrom, and oxidizing the resulting absorbed solution with an oxygen-containing gas while neutralizing the solution with limestone in order to fix the sulfur dioxide in the form of gypsum for separation. The improvement comprises adding maleic anhydride and limestone to the absorbed solution during the residence time of the absorbed solution, the resulting absorbed solution being oxidized with an oxygen-containing gas to reproduce an absorbing solution therefrom so as to be effectively reused for the absorption of sulfur dioxide in the off-gas for separation.

REFERENCES:
patent: 3757488 (1973-09-01), Austin et al.
patent: 3798309 (1974-03-01), Knowles et al.
patent: 3928537 (1975-12-01), Saitoh et al.
patent: 4092402 (1978-05-01), Kobuyashi et al.
patent: 4367205 (1983-01-01), Kudo et al.

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