Efficient Separation of Acetylene-Containing Mixtures Using ZIF‑8 Membranes

High Resolution Image Download MS PowerPoint Slide Metal–organic framework (MOF) membranes show great potential in the separation of acetylene mixtures. In this work, we have prepared ZIF-8 membranes on polyamide (PA) substrates for the highly selective separation of acetylene/methane and acetylene/carbon dioxide mixtures. The C 2 H 2 /CH 4 and C 2 H 2 /CO 2 mixtures can be successfully separated using the ZIF-8 membranes, with separation factors of 12.1 and 1.8, respectively. Based on the results of the cross-permeation tests of C 2 H 2 /CH 4, CO 2 /CH 4, and C 2 H 2 /CO 2, the separation mechanism of C 2 H 2 /CH 4 in our ZIF-8 membrane can be attributed to a higher affinity for acetylene and molecular sieving effect, while C 2 H 2 /CO 2 separation is related to thermodynamic factors. It is worth noting that this is the first example of MOF membranes to successfully separate C 2 H 2 from CH 4 and CO 2 .

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