Cellulose acetate–poly(N-vinyl-2-pyrrolidone) blend membrane for pervaporation separation of methanol/MTBE mixtures
Cellulose acetate–poly(N-vinyl-2-pyrrolidone) blend membrane for pervaporation separation of methanol/MTBE mixtures
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DOI：
10.1016/j.seppur.2008.09.013
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发表时间：
2008-12
影响因子：
8.6
通讯作者：
Hong Wu;Xin Fang;Xiongfei Zhang;Zhongyi Jiang;Ben Li;Xiaocong Ma
中科院分区：
文献类型：
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作者：
Hong Wu;Xin Fang;Xiongfei Zhang;Zhongyi Jiang;Ben Li;Xiaocong Ma
制备了不同组成的醋酸纤维素（CA）与聚乙烯吡咯烷酮（PVP）共混膜，用于渗透汽化分离甲醇/甲基叔丁基醚（MTBE）混合物。采用FTIR、TGA、DSC和XRD等方法对共混膜的结构形态、热稳定性和结晶度进行了表征。考察了共混膜中PVP含量对渗透汽化性能的影响，并从吸附和扩散行为方面进行了讨论。当PVP含量在10- 15 wt.%范围内时，渗透通量随PVP含量的增加而增加，分离因子也随PVP含量的增加而增加。考察了操作温度、进料流量和进料组成等操作条件对渗透汽化分离性能的影响。在所有制得的共混膜中，含有85 wt. CA和15 wt.% PVP表现出最高的分离因子，其值为411，并且对于由20 wt.%组成的进料的渗透通量为430 gm-2 h-1甲醇，313 K。
Cellulose acetate (CA) and poly(N-vinyl-2-pyrrolidone) (PVP) blend membranes with different compositions were prepared for the pervaporation separation of methanol/MTBE mixtures. The structural morphology, thermal stability and crystallinity of the blend membranes were characterized by FTIR, TGA, DSC and XRD. The effect of PVP content in the blend membranes on the pervaporation performance was investigated and discussed in terms of the sorption and diffusion behavior. The permeation flux was increased by the addition of PVP and the separation factor was also increased when the PVP content was in the range of 10–15wt.%. The effect of operating conditions including the operating temperature, the feed flow rate and the feed composition on the pervaporation performance was extensively investigated. Among all the fabricated blend membranes, the membrane containing 85wt.% CA and 15wt.% PVP showed the highest separation factor with a value of 411 and a permeation flux of 430gm−2h−1for a feed composed of 20wt.% methanol at 313K.