Acid Gas: Effect on Membrane Properties
- 92 Downloads
Acidic gas removal is the largest application of gas separation membranes and a vital process in the natural gas processing industry. Membranes used in this process are designed to separate H2S and CO2, and this process is known as natural gas sweetening. This is readily required for low-quality natural gas reserves, which need to be processed to achieve pipeline specifications of CO2 <2 mol% and H2S <4 ppm (Baker 2001). The removal of acidic gases is also required for biogas and gasification, where H2S and CO2 are separated from CH4, CO, and H2. For natural gas sweetening, the membrane must exhibit high permeability for H2S and CO2, with a large selectivity relative to methane.