CAO Xiaochang, WANG Zhi, QIAO Zhihua, et al. One-step fabrication of asymmetric membranes containing amino compound for CO2 separation[J]. CIESC Journal, 2018, (11): 4778-4787. DOI: 10.11949/j.issn.0438-1157.20180588.
CAO Xiaochang, WANG Zhi, QIAO Zhihua, et al. One-step fabrication of asymmetric membranes containing amino compound for CO2 separation[J]. CIESC Journal, 2018, (11): 4778-4787. DOI: 10.11949/j.issn.0438-1157.20180588.DOI:
A one-step phase separation method was used to prepare a membrane base on polyethersulfone (PES) and diethanolamine (DEA) as an additive and an amino carrier for CO2 separation. CO2 separation membranes show promising applications in energy gas purification and flue gas CO2 capture. However
the separation performance of commercial membranes can hardly meet the practical requirement. To easily fabricate membrane with enhanced CO2 separation performance
diethanol amine (DEA) was filled into polyether sulfone (PES) to fabricate asymmetric membranes in one-step by non-solvent induce phase separation (NIPs). The effects of the PES content
DEA content
coating thickness and the heat treatment on the separation performance of DEA/PES membrane were investigated by using CO2/N2 mixed gas (15/85 by volume). When the PES content was 26% and the DEA content was 12% in the coating solution and the feed gas pressure was 0.11 MPa
the DEA/PES membrane exhibited a CO2permeance of 274 GPU and a CO2/N2selectivity of 50. The stability results indicate that the CO2/N2 separation performance of DEA/PES membrane remained stable at 40℃. Moreover
the CO2/N2 best-performing DEA/PES membrane was used to separate CO2/CH4 mixed gas (10/90 by volume). The CO2/CH4 separation performance at 1.0 MPa was better than commercial membranes. These results shows promising applications of DEA/PES membranes in CO2 separation.