Development of a polyvinyl alcohol/sodium polyacrylate composite polymer membrane with cesium carbonate as a mobile carrier for high-performance CO2 capture

Composite polymer membranes were prepared using carbonate, polyvinyl alcohol, an acrylic acid polymer partial sodium salt cross-linked product, and sodium polyacrylate. In this study, the factors for further improving the separation performance of these membranes for the CO2/He mixed gas were investigated. It was confirmed that the prepared membranes did not provide stable separation under pressure unless they had a thickness of 2.0 mu m. Moreover, they could not function as high-performance separation membranes without a carbonate additive; the optimal carbonate concentration range was determined by considering the effect of the total pressure. As a result, this work produced a high-performance, CO2 selective permeable membrane with selectivities of more than 500 and 150 at 0.1 and 0.7 MPa, respectively, for the separation of a CO2/He (80/20) gas mixture at 85 degrees C.

Automated summary

By incorporating carbonate into composite polymer membranes, the separation performance of CO2/He mixed gas was improved. The experiment results showed that the membrane exhibited optimal separation performance at a certain thickness and carbonate concentration range.