特集：炭化水素分離に貢献する分離膜の最前線
銀カチオン交換X型ゼオライト膜によるオレフィン分離精製
2020 年 45 巻 6 号 p. 262-267
詳細
2020 年 45 巻 6 号 p. 262-267
Ag–exchanged X–type zeolite membrane has been developed for olefin/paraffin mixture separation. Preparation method, separation property, and separation mechanism of Ag–X membrane were investigated. Olefins preferentially adsorb on and penetrate through Ag–X membrane through the contribution of strong interaction between Ag cation and olefins’π–electron. Paraffin permeation is inhibited due to the occupation of micropores by adsorbed olefins. Ag–X membrane exhibited the maximum propylene selectivity of 70 with the permeance of 4.5 × 10–8 mol m–2 s–1 Pa–1 at 353 K for a propylene/propane (50 : 50) mixture. Ag–X membrane also showed stable permselectivity over 7000 h for propylene/propane separation.
