The invention relates to a process for removing hydrogen sulfide and
recovering sulfur from a gas stream, comprising the steps of: contacting
said gas stream with an aqueous catalyst solution of a polyvalent metal
redox catalyst in a contacting zone to absorb said hydrogen sulfide and
form a reduced catalyst solution comprising reduced polyvalent metal
redox catalyst and sulfur particles; oxidizing said reduced catalyst
solution while removing sulfur particles to form said oxidized aqueous
catalyst solution comprising polyvalent metal redox catalyst in an
oxidized state with sulfur particles removed; and recovering sulfur by
transferring at least one of said sulfur particles and foam to a
separation zone; wherein a coagulating reagent is added to a feed of said
separation zone prior to entering said separation zone to promote
settlement of sulfur particles.