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Separation of ethanol/water azeotrope using compound starch-based adsorbents

Yanhong Wang, Chunmei Gong, Jinsheng Sun, Hong Gao, Shuai Zheng, and Shimin Xu

Bioresour Technol 101(15):7 (2010) PMID 20304634

Comparing breakthrough cures of five starch-based materials experimentally prepared for ethanol dehydration, a compound adsorptive agent ZSG-1 was formulated with high adsorption capacity, low energy and material cost. The selective water adsorption was conducted in a fixed-bed absorber packed with ZSG-1 to find the optimum conditions yielding 99.7wt% anhydrous ethanol with high efficiency. The adsorption kinetics is well described by Bohart-Adams equation. The adsorption heat, @DH"a"b"s, was calculated to be -3.16x10^4Jmol^-^1 from retention data by inverse gas chromatography. Results suggested that water entrapment in ZSG-1 is a exothermic and physisorption process. Also, ZSG-1 is recyclable for on-site multiple-use and then adapt for upstream fermentation process after saturation, avoiding pollution through disposal.

Copyright © 2010 Elsevier Ltd. All rights reserved.

DOI: 10.1016/j.biortech.2010.02.102
Version: za2963e q8za0 q8zbe q8zc4 q8zda q8ze1 q8zf7 q8zga

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