PROCESS FOR PRODUCING A SUBSTANTIALLY H2S-FREE GAS FROM A SOUR GASEOUS STREAM SUCH AS NATURALLY-OCCURING GASES SYNTHESIS GASES,PROCESS GASES AND FUEL GASES

摘要

A sour gaseous stream comprising H2S is contacted in column 2 with an aqueous reactant solution comprising an effective amount of Fe(III) chelate of an organic acid to obtain a sweet gaseous stream and a mixture including solid sulphur and Fe(II) chelate of the acid. Degradation of the iron chelate in the reactant solution employed in the cyclic processes for H2S removal from sour gaseous streams is inhibited by maintaining a relatively high Fe(II) chelate concentration by carrying out the regeneration step in colomn 8 as a plug flow contacting procedure.