Simulation of H2S and CO2 removal from IGCC syngas by cryogenic distillation

•Cryogenic distillation made full use of syngas pressure to remove H2O, H2S and NH3, and CO2 by pressurizing step by step and without repeated work.•CO2 purity was as high as 99.94% to completely meet the requirements for transport and storage.•It has no absorbent, hence avoiding solvent regeneration and solvent loss.•The process was simple with two towers to reduce operation cost.