摘要：AbstractThe consumption of natural gas (NG) is rapidly increasing worldwide as it is becoming the second largest fuel source after coal. However, many of the world gas reserves contain high levels of subquality NG including the presence of carbon dioxide (CO2), hydrogen sulfide (H2S), nitrogen (N2), benzene/toluene/xylene (BTX) etc., in varying amounts (up to 50% v/v in some reserves), which constitute several problems. Membrane‐based NG sweetening/upgrading processes emerge as among the fastest growing technologies, due to their lower capital cost, higher energy savings, greater economic viability, etc. as compared to conventional technologies. Thus, a defective‐free, multilayer thin‐film composite membrane is developed from 6FDA‐Durene/6FDA‐CARDO block co‐polyimide for the separation of sour gas from NG. The membrane shows good performance as it exhibit CO2/CH4and H2S/CH4selectivities ranges from 8 to 10 and 15 to 19, respectively, and CO2and H2S permeance are 122 and 220 GPU, respectively.A defective‐free multilayer thin film composite membrane is developed from block co‐polyimide for the separation of sour gas from natural gas. The thin‐film composite membrane shows good performance under high H2S environment. The membrane exhibits CO2/CH4and H2S/CH4selectivities ranges from 8 to 10 and 15 to 19, respectively, and CO2and H2S permeances are up to 122 and 220 GPU, respectively.
