“…The HF supports selected were polysulfone (PSf) for the CS‐based membranes and P84 for the PTMSP‐based membranes, because of compatibility issues that will be discussed later. Both PSf and P84 HF supports were prepared at Tecnalia by conventional spinning techniques . As in the composite flat MMMs, the composite HF membranes were prepared by coating the selective solution, i.e., PTMSP, 20 wt % zeolite A/PTMSP, IL‐CS, and 5 wt % HKUST‐1/IL‐CS, respectively, on the outer side of the HF support, with the extremes covered to prevent penetration in the lumen side.…”