Hydrate-based Synchronously Capture of CO2 and H2S for Clean H2 with New Synergic Additives

Abstract

The integrated gasification combined cycle (IGCC) process, possessing high efficiency and environmental advantages, produces H2-rich syngas at high pressures. Acid gases carbon dioxide (CO2) and hydrogen sulfide (H2S) are important and highly undesirable contaminants for syngas, and hydrate-based removal of these contaminants is environmentally attractive. This work experimental investigated the hydrate-based acidic gases (CO2 and H2S) capture for clean hydrogen (H2) fuel from syngas with new synergic additives, which comprise physical gas solvent (TMS) and traditional hydrate promoter (TBAB). The results show that, with the synergic additives, the equilibrium hydrate formation pressure can be moderated by about 90%, the gas selectivity can be improved by 50%, and the formation rate and gas storage capacity can also be improved. Furthermore, the promotion effect can be enhanced when with the help of H2S. It has been testified that CO2 and H2S could be synchronously captured through the hydrate formation process.