Abstract
PEBAX-5513/AgBF4/Al(NO3)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/AgBF4/Al(NO3)3 membranes had long-term stability because of Al(NO3) 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(NO3)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 NO3− ions in Al(NO3)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.
Highlights
The facilitated transport of polymer membranes using Ag+ ions from precursors such as AgBF4, AgCF3SO3, and AgNO3 showed prominent achievement for olefin/paraffin separation[9,10,11,12]
Ag+ ions could act as olefin carriers, owing to Al(NO3)[3], a reduction inhibitor
The membrane permeance decreased because the proportion of the ether group, the permeable segment in PEBAX, decreased
Summary
The facilitated transport of polymer membranes using Ag+ ions from precursors such as AgBF4, AgCF3SO3, and AgNO3 showed prominent achievement for olefin/paraffin separation[9,10,11,12]. The membrane properties of the POZ/AgBF4/Al(NO3)[3] membrane lasted for more than 14 days, and the white color of the membranes remained unchanged for 3 months due to the reduction of Ag+ ions[15]. These phenomena were generated from that the Al3+ ions in Al(NO3)[3] had a favorable electrostatic interaction with the BF4− ions in AgBF4. The POZ/AgBF4/Al(NO3)[3] membrane had long-term stability It had a relatively low permeance of 4.8 GPU15. In case of PEBAX-1657, 60% of the permeable ether group and 40% of the hard amide group were able to obtain a high permeance, but the selectivity tended to be relatively low[6]
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