Process for acid gas removal from gaseous mixtures

摘要

A hybrid physical-chemical absorbent process using the interrelation between a physical solvent and a H2S selective chemical solvent for removal of CO2 and sulfur containing compounds, principally H2S from a mixed gas stream. This process is especially useful in processes such as coal gasification where the incoming stream to the acid gas removal process is at about 1100 psia, 70 DEG F., contains about 15 to 40 mole percent CO2 at a mole ratio of CO2/H2S of about 25 to 50. In such cases the product stream contains less than 1 ppm sulfur and less than 3 mole percent CO2 which is suitable for production of substitute natural gas while the CO2 atmospheric effluent contains less than 7 ppm sulfur.