膜科学与技术

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Effect of H2O/BTESE molar ratio on organic-inorganic hybrid silica membranes for dehydration of acetic acid by pervaporation

Authors： ZHANG Zinan, REN Xiuxiu, ZHONG Jing, XU Rong, GUO Meng, WU Zihao, LIU Ruoyan

Units： Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164

KeyWords： hybrid silica membrane; H2O/BTESE molar ratio; pervaporation; acetic acid dehydration

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(5):44-49

Abstract：

BTESE organic-inorganic hybrid silica membranes were prepared by acid-catalyzed sol-gel method using 1,2-bis(triethoxysilyl)ethane (BTESE) as the silica precursor. To improve its pervaporation acetic acid dehydration performance, the silica network was regulated by the water to BTESE molar ratio (H2O/BTESE) in the sol-gel synthesis. As the water content increased, the hydrolyzed Si-OH increased and the pore size of the formed gel was effectively reduced, which increased the separation factor and decreased the flux in the membrane for pervaporation acetic acid dehydration. The BTESE membrane prepared with a molar ratio of 180 of H2O/BTESE showed the best overall separation index, with pervaporation separation of 90wt% acetic acid/10 wt% aqueous solution at 75 ℃ with permeate flux and separation factor of 1.25 kg/(m2·h) and 1050, respectively. The membrane was immersed in acetic acid solution and exposed to air, and the acetic acid dehydration separation performance of the membrane remained basically stable for up to 80 days, with good long-term acid resistance and anti-oxidation chemical stability.

Funds：

国家重点研发计划（2022YFB3805003）资助项目；常州市科技计划项目（CJ20220140，CZ20220033）；江苏省教育厅国际合作联合实验室

AuthorIntro：

张子男（1997-），男，吉林辽源，硕士研究生，主要从事膜分离方面研究。

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