Societe Nationale Elf Aquitaine

Societe Nationale Elf Aquitaine (production)

Pierre Grancher

Claude Blanc

Jacques Batteux

The invention concerns a process for the purification of residual industrial gases containing a small quantity of H.sub.2 S, SO.sub.2, CS.sub.2, COS, or possibly sulfur vapor, as well as large amounts of H.sub.2 O, CO.sub.2 and N.sub.2 in which the residual gases are first subjected to a catalytic reduction in which all the sulfur compounds are transformed into H.sub.2 S, and thereafter washed by an aqueous amine solution before being burnt and discarded into the atmosphere, while the aqueous amine solution is regenerated by heating and the gases given off, comprising H.sub.2 S and CO.sub.2, are returned to the sulfur manufacturing plant. The process is characterized in that the temperature of the gas to be treated is permanently maintained at a level higher than the dew-point of the water contained in the gases at all points of the process, thereby insuring that substantially all H.sub.2 O contained in the residual gases is discarded into the atmosphere.

Process for the purification of residual industrial gases containing

The invention concerns a process for the purification of residual industrial gases containing a small quantity of H.sub.2 S, SO.sub.2, CS.sub.2 COS, or possibly sulfur vapor, as well as large amounts of H.sub.2 O, CO.sub.2 and N.sub.2 in which the residual gases are first subjected to a catalytic reduction in which all the sulfur compounds are transformed into H.sub.2 S, and thereafter washed by an aqueous amine solution before being burnt and discarded into the atmosphere, while the aqueous amine solution is regenerated by heating and the gases given off, comprising H.sub.2 S and CO.sub.2, are returned to the sulfur manufacturing plant. The process is characterized in that the temperature of the gas to be treated is permanently maintained at a level higher than the dew-point of the water contained in the gases at all points of the process, thereby insuring that substantially all H.sub.2 O contained in the residual gases is discarded into the atmosphere.

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Pau, France

Pierre Grancher