Saipem S.p.a.

David Zhang

Sylvain Lefebvre

Ferrere Clerveaux

Richard Surprenant

Gabriel Veilleux

A desulfurization gas process includes water vapor, COand SO(x=2 and/or 3). In a treatment unit, the gas contacts a cooled alkaline aqueous solution having a temperature lower than an initial gas temperature, water and a carbonate of an alkali metal, to cool the gas, condense some water vapor and absorb SOin the carbonate-containing solution, produce an SO-depleted gas and an acidic aqueous solution including sulfate and/or sulfite ions. The SO-depleted gas and a portion of the acidic aqueous solution can then be withdrawn from the treatment unit. Carbonate of the alkali metal can be added to remaining acidic aqueous solution to obtain a made-up alkaline aqueous solution. This solution can be cooled and reused as the cooled alkaline aqueous solution. An SOabsorbent solution includes a bleed stream from a CO-capture process, sodium or potassium carbonate, and an acidic aqueous solution obtained from desulfurization.

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David Zhang