Pervaporation properties of polyvinyl alcohol/ceramic composite membrane for separation of ethyl acetate/ethanol/water ternary mixtures |
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Authors: | Shanshan Xia Wang Wei Gongping Liu Xueliang Dong Wanqin Jin |
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Affiliation: | 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, 5 Xinmofan Road, Nanjing, 210009, P. R. China
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Abstract: | In further purification of ethyl acetate (EAC) process, azeotropic distillation or extractive distillation is usually applied.
High energy consumption limits the economic profit of the process. In this study, pervaporation separation of EAC/ethanol
(EA)/water ternary mixtures using the ceramic-supported polyvinyl alcohol (PVA) composite membrane was investigated to substitute
the azeotropic distillation or extractive distillation. Swelling experiments were performed to evaluate the sorption characteristic
of the membrane. Flory-Huggins theory was applied to study the interaction between the membrane and the penetrant. The UNIFAC
model was adopted to investigate the variation of the penetrant activity in the membrane. The effects of operation temperature,
feed water content and feed flow rate on the PV performance of the membrane were systematically investigated. The composite
membrane exhibited high PV performance with the total flux of 2.1 kg·m−2·h−1 and 94.9 wt% permeate concentration of water (operation condition: feed composition 82.6 wt% EAC, 8.4 wt% EA, 9 wt% water,
feed temperature 60 °C, feed flow rate 252 mL· min−1). The PV performance of the membrane varied slightly over a continuous PV experiment period of 110 h. Our results demonstrated
that the PVA/ceramic membrane was a potential candidate for the purification of EAC/EA/water ternary mixtures. |
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