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Ionic liquid modified multiwalled carbon nanotube embedded styrene butadiene rubber membranes for the selective removal of toluene from toluene/methanol mixture via pervaporation
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2018-11-12 , DOI: 10.1016/j.jtice.2018.09.019
Jiji Abraham , Thomaskutty Jose , Grace Moni , Soney C. George , Nandakumar Kalarikkal , Sabu Thomas

Present work reports the fabrication of elastomeric membrane based on ionic liquid functionalized multiwalled carbon nanotubes (f-MWCNT) incorporated Styrene butadiene rubber (SBR) for the separation of azeotropic composition of toluene and methanol. The fabricated membranes were characterized by morphological analysis using transmission electron microscopy and glass transition temperature and heat capacity measurements by differential scanning calorimetry. Composite membranes demonstrate impressive separation performance with preferential selectivity towards toluene and 5 phr f-MWCNT loaded membranes was found to show the best result with respect to toluene flux and selectivity. Optimal separation performance with the permeation flux 225% of SBR control membrane and separation factor of 128 (1.6 times of SBR control membrane) is obtained for this membrane. The concurrent optimization of the physical and chemical structures of toluene permeation path on f-MWCNT surface provides the membrane with high-efficiency toluene permeation. Ionic liquid on MWCNT surface confer aromatic pi-pi interaction with toluene molecules leading to greater toluene affinity and higher repellency against methanol. Pervaporation characteristics of the membranes were also strongly influenced by the feed mixture composition. The study confirmed that increasing toluene concentration improved the toluene flux but reduced the separation factor. The experimental pervaporation fluxes were compared with the calculations based on modified Maxwell–Stefan equation. The model allows a good quantitative prediction of experimental flux values.



中文翻译:

离子液体改性的多壁碳纳米管嵌入式苯乙烯-丁二烯橡胶膜,用于通过渗透蒸发从甲苯/甲醇混合物中选择性除去甲苯

目前的工作报道了基于离子液体功能化多壁碳纳米管(f- MWCNT)并结合苯乙烯丁二烯橡胶(SBR)的弹性膜的制造,以分离甲苯和甲醇的共沸成分。通过使用透射电子显微镜的形态分析以及通过差示扫描量热法测量玻璃化转变温度和热容来表征所制造的膜。复合膜表现出令人印象深刻的分离性能,对甲苯和5 phr f-发现载有MWCNT的膜在甲苯通量和选择性方面显示出最好的结果。对于该膜,获得了最佳分离性能,其中SBR控制膜的渗透通量为225%,分离系数为128(SBR控制膜的1.6倍)。f上甲苯渗透路径的物理和化学结构的同时优化-MWCNT表面为膜提供了高效率的甲苯渗透。MWCNT表面上的离子液体赋予芳族pi-pi与甲苯分子的相互作用,从而导致更大的甲苯亲和力和更高的对甲醇的排斥性。进料混合物的组成也极大地影响了膜的全蒸发特性。研究证实,提高甲苯浓度可提高甲苯通量,但会降低分离系数。将实验的全蒸发通量与基于改进的麦克斯韦-斯蒂芬方程的计算结果进行了比较。该模型可以对实验通量值进行良好的定量预测。

更新日期:2018-11-13
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