分子筛
渗透
吸附
巴勒
膜
化学工程
碳化
聚合物
热解
惰性气体
乙烯
高分子化学
材料科学
气体分离
碳纤维
化学
有机化学
吸附
催化作用
复合材料
工程类
复合数
生物化学
作者
Octavio Salinas,Xiaohua Ma,Eric Litwiller,Ingo Pinnau
标识
DOI:10.1016/j.memsci.2015.12.052
摘要
Fine-tuning the microporosity of PIM-1 by heat treatment was applied to develop a suitable carbon molecular sieve membrane for ethylene/ethane separation. Pristine PIM-1 films were heated from 400 to 800 °C under inert N2 atmosphere (<2 ppm O2). At 400 °C, PIM-1 self-cross-linked and developed polar carbonyl and hydroxyl groups due to partial dioxane splitting in the polymer backbone. Significant degradation occurred at 600 °C due to carbonization of PIM-1 and resulted in 30% increase in cumulative surface area compared to its cross-linked predecessor. In addition, PIM-1-based CMS developed smaller ultramicropores with increasing pyrolysis temperature, which enhanced their molecular sieving capability by restricted diffusion of ethylene and ethane through the matrix due to microstructural carbon densification. Consequently, the pure-gas ethylene permeability (measured at 35 °C and 2 bar) decreased from 1600 Barrer for the pristine PIM-1 to 1.3 Barrer for the amorphous carbon generated at 800 °C, whereas the ethylene/ethane pure-gas selectivity increased significantly from 1.8 to 13.
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