In this study, removal of high concentration of hydrogen sulfide from H2S/CH4 compares with those of low concentration. The experiments based on membrane separation using commercial polyphenylene oxide (PPO) hollow fiber membrane. It was observed that in the concentration range of 101 to 5008 ppm H2S in CH4, the trends of permeability of hydrogen or methane are not similar in the whole range. In the concentrations of 101, 198, and 968 ppm H2S in methane, plasticization is often defined as the increase in H2S-permeance with feed pressure, due to dilation of the glassy polymeric matrix; while for the H2S feed concentrations of 401 and 3048 ppm, the competitive sorption effects dominant, and for H2S concentration of 5008 ppm the balance between these two effects plays an important role for explanation of its trend. This diversity, results different trends of separation factors and ideal selectivities. In the range of 101 to 5008 ppm H2S in methane, the effect of temperature on separation factor is nearly negligible. Moreover, in the range of 101 to 401 ppm H2S in CH4, ideal selectivity is decreased as temperature increased; while in the range of 968 to 5008 ppm, this parameter is increased by increasing the temperature.

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