Author:
Yang Zhengquan,Peng Mingyu,Li Yu,Wu Xiaowei,Gui Tian,Li Yuqin,Zhang Fei,Chen Xiangshu,Kita Hidetoshi
Abstract
In this work, a dense and acid-resistant beta zeolite membrane was applied to improve the esterification of citric acid and n-butanol, for the first time. Through the continuous removal of the by-product water via pervaporation (PV), the conversion of citric acid was significantly enhanced from 71.7% to 99.2% using p-Toluenesulfonic acid (PTSA) as catalyst. PTSA was a well-known strong acid, and the membrane kept almost no change after PV-esterification, indicating the superior acid resistance of beta zeolite membrane. Compared to the use of acid-resistant MOR zeolite membrane by PV-esterification, a consistently higher conversion of citric acid was obtained using a high-flux beta zeolite membrane. The results showed that high water permeation on the beta zeolite membrane, with good acid resistance, had a strong promoting effect on esterification, leading to an improved conversion. In addition, the citric acid conversion of 97.7% could still be achieved by PV-esterification at a low reaction temperature of 388 K.
Funder
National Natural Science Foundation of China
International Science Technology Cooperation Program of China
Jiangxi Provincial Department of Science and Technology
Science and Technology Project of the Education Department of Jiangxi Province
Jiangxi Normal University and the Open Project Program of State-Province Joint Engineering Laboratory of Zeolite Membrane Materials
Subject
Filtration and Separation,Chemical Engineering (miscellaneous),Process Chemistry and Technology
Cited by
3 articles.
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