Pervaporation dehydration of C2–C4 alcohols by 6FDA-ODA-NDA/Ultem® dual-layer hollow fiber membranes with enhanced separation performance and swelling resistance
Pervaporation dehydration of C2–C4 alcohols by 6FDA-ODA-NDA/Ultem® dual-layer hollow fiber membranes with enhanced separation performance and swelling resistance
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DOI：
10.1016/j.cej.2009.09.015
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发表时间：
2009-12
影响因子：
15.1
通讯作者：
N. Widjojo;T. Chung
中科院分区：
文献类型：
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作者：
N. Widjojo;T. Chung
采用共挤出法制备了一种新型的用于渗透汽化脱水的copoly(4，4′-diphenyleneoxide/1，5-napthalene-2，2′-bis(3，4-二羧基苯基)六氟丙二酰亚胺(6FDA-ODANDA/Ultem1010)双层中空纤维膜。它不仅可以在不进行任何后处理的情况下获得令人印象深刻的酒精脱水性能，而且它还特别减少了膜对酒精水溶液的溶胀行为。对于异丙醇、正丁醇和叔丁醇的85/15(醇/水)重量比的料液脱水，6FDA-oda-NDA/Ultem®1010双层中空纤维膜可以成功地实现水含量大于99.7wt.%的渗透，并具有相当高的通量，这意味着各自酒精体系的独特分离系数。6FDA-ODA-NDA/Ultem®1010双层中空纤维膜在各种水酒精饲料中的优异脱水性能可以归功于：(1)外层和内层涂料成分的精确配方；(2)外层形成的d-空间尺寸与酒精脱水系统的尺寸排斥机制非常匹配；(3)Ultem®1010聚酰亚胺作为支撑层具有相对较低的吸水率和较小的溶胀特性。通过调整纺丝参数，即外层浆液流量和气隙距离，可以进一步提高6FDA-oda-NDA/Ultem®1010双层中空纤维膜的分离性能。
A novel copoly(4,4′-diphenyleneoxide/1,5-napthalene-2,2′-bis (3,4-dicarboxyl phenyl) hexa fluoro propane diimide) 6FDA-ODA-NDA/Ultem®1010 dual-layer hollow fiber membrane for pervaporation dehydration has been fabricated via co-extrusion process. Not only can it achieve impressive alcohol dehydration performance without any post-treatment but also it particularly minimizes the membrane's swelling behavior towards aqueous alcohol solution. For isopropanol, n-butanol and t-butanol dehydrations of 85/15 (alcohol/water) wt.% feed solutions, the 6FDA-ODA-NDA/Ultem®1010 dual-layer hollow fiber membrane can successfully attain permeate containing more than 99.7wt.% water with considerably high flux which implies to a distinctive separation factor of the respective alcohol system. The outstanding dehydration performance of 6FDA-ODA-NDA/Ultem®1010 dual-layer hollow fiber membranes on various aqueous alcohol feeds can be attributed to: (1) a precise formulation of the outer- and inner-layer dope compositions; (2) the size of d-space created in the outer-layer is a good match for size exclusion mechanism in the alcohol dehydration systems; (3) a relatively low water uptake and less swelling characteristics of the Ultem®1010 polyimide as a supporting layer. By adjusting spinning parameters, i.e. outer-layer dope flow rate and air gap distance, the separation performance of 6FDA-ODA-NDA/Ultem®1010 dual-layer hollow fiber membranes can be further improved.