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Abstract

A method for scrubbing sulfur-containing gases with a circulated ammoniacal scrubbing solution is described. A sulfur-containing and nitrogen-containing gas is freed from sulfur compounds and nitrogen compounds with an aqueous alkaline solvent suchthat a purified industrial gas and a solvent loaded with nitrogen compounds and sulfur compounds is obtained, which is then passed into a desorption column. A desorbed acid gas is obtained which is passed into a Claus process such that the majority of the sulfur compounds are removed. The residual gas from the Claus process is hydrogenated such that a sulfur-containing and ammonia-containing residual gas is obtained which is passed into the absorption column where it is purified using the same aqueous solvent as in the first circuit, whereafter the loaded solvent is passed from this column into the desorption column from the first gas scrubber in such a manner that only one desorption column is required.

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First Claim