(449ai) CMS Membranes for Nitrogen and Sour Gases Purification from Natural Gas
This research prepared CMSMs from a commercially available polymer Kapton® Polyimide for the separation of N2/CH4 and CO2/CH4 gas pairs. The membrane were pyrolyzed at 3 different temperatures (600, 700, and 800°C) and tested for pure gas of N2, CO2, CH4, and Helium.
The permeation data showed that the membrane with good separation performance for CH4/N2 gas pair as well as for CO2/CH4 gas pair with interesting results in gas separation. By comparing the permeation fluxes at different temperatures and membrane of different thicknesses, the effect of surface diffusion/surface flux were found to be significant for sorptive species like CO2 and CH4, but less prominent on N2 and helium.