Autor: |
Zhengquan Yang, Mingyu Peng, Yu Li, Xiaowei Wu, Tian Gui, Yuqin Li, Fei Zhang, Xiangshu Chen, Hidetoshi Kita |
Jazyk: |
angličtina |
Rok vydání: |
2022 |
Předmět: |
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Zdroj: |
Membranes, Vol 12, Iss 12, p 1269 (2022) |
Druh dokumentu: |
article |
ISSN: |
2077-0375 |
DOI: |
10.3390/membranes12121269 |
Popis: |
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. |
Databáze: |
Directory of Open Access Journals |
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