Process for the desulfurization of flue gas

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component

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423563, C01B 700, B01J 800

Patent

active

040013758

ABSTRACT:
The instant invention relates to a process for the removal of sulfur oxides from gases which comprises the steps of contacting the gas with a cerium oxide sorbent at conditions whereby the sulphur oxides present in the gas are sorbed by said cerium oxide sorbent and regenerating said cerium oxide sorbent by contacting with a reducing atmosphere at conditions whereby the sorbent is substantially converted to a sulfur-free state. The gas may be an exhaust gas, e.g. from an automobile or a flue gas. This invention is especially preferred for treating flue gas. In this preferred embodiment, the flue gas may be contacted with the cerium oxide sorbent at a temperature of from 300.degree. to 800.degree. C. to form cerium sulfate and/or sulfite and the sorbent is regenerated by contacting with a reducing gas, for example, hydrogen in admixture with steam or other inert gases at a temperature of from 500.degree. to 800.degree. C. to convert the cerium sulfate or sulfite to cerium oxide. During the regeneration step, the desorbed species is initially sulfur dioxide. However, when about 50% of the sulfur is removed from the sorbent, the desorbed species becomes H.sub.2 S. Thus, the instant invention provides SO.sub.2 and H.sub.2 S in admixture with the excess reducing gas, which can be fed conveniently to the Claus plant for conversion into elemental sulfur.

REFERENCES:
Lowell et al., Selection of Metal Oxides for Removing SO.sub.2 from Flue Gas, Ind. Eng. Chemical Process Design, Development, vol. 10, No. 3, 1971.

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