摘要：PEBAX-5513/AgBF 4 /Al(NO 3 ) 3 membranes were fabricated for mixed olefin/paraffin separation. In order to improve the selectivity of the membranes utilizing PEBAX-1657, PEBAX-5513, which increased the ratio of amide groups from 40% to 60% in the copolymer, was used. The selectivity and permeance of the membranes were 7.7 and 11.1 GPU, respectively. Furthermore, the PEBAX-5513/AgBF 4 /Al(NO 3 ) 3 membranes had long-term stability because of Al(NO 3 ) to have the stabilizing effect on Ag + ions acting as an olefin carrier. Unexpectedly, the performance of the membrane selectivity was not improved, and the permeance became rather lower. Generally, when Ag + ions was added to the polymer containing amide groups, the selectivity increased with the content of the amide groups. However, Al(NO 3 ) 3 was added for the stability of Ag + ions and there was no increase in selectivity. Since the ratio of amide was high, Ag + ions were favorably in coordination with the oxygen of the carbonyl group, but the NO 3 - ions in Al(NO 3 ) 3 had the enhanced interaction with Ag + ions as obstacles for olefin complexation. Therefore, the composition ratio of amide/ether in the polymer matrix was negligible for olefin separation.
