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Synthesis of high packed density NaA zeolite membrane plate for biofuel ethanol production

Authors： Deng Yanhong, Lu Jiuling, Wang Hu, Sun Hao, Li Beibei, Cao Yi, Li Hui, Zhang Wei, Li Yanshuo

Units： 1 Suzhou COFCO biochemistry Co., Ltd. Anhui Suzhou 234001 China 2School of Material Science and Chemical Engineering, Ningbo university, Zhejiang Ningbo 315211 China

KeyWords： Biofuel ethanol, NaA membrane, pervaporation, succeeding seeding method, dehydration

ClassificationCode：TQ028.3

year,volume(issue):pagination： 2022,42(1):24-32

Abstract：

Biofuel ethanol technology is one of the most powerful carbon neutral technologies. Biofuel ethanol can be obtained by grain fermentation, but the concentration of ethanol in fermentation broth is low, further enrichment and purification are needed. Purification by pervaporation technology is the highest energy efficiency process, and the membrane is the core of this technology. A calcination modified succeeding seeding method (CMSSM) was developed for the fabrication of the high-performance NaA zeolite membrane on the ceramic plate support. The effect of thermal-treatment temperature and time of the mother liquid coating on the synthesis of NaA membrane was explored. The SEM results revealed that the coating could modified the planeness of the support, coating became smooth with the increment of calcination temperature, but the calcination temperature was too high would roughen the coating. The NaA membrane, which was prepared with the mother liquid coating calcined at 500 ℃ for 3 h, exhibited dense and smooth surface with the thickness of 1.4 um, as well as the highest crystallinity. However, many defects can be observed for the NaA membrane prepared with calcined coating at 700 °C. Thus, with the usage of coating calcined at 500 ℃ for 3 h, the best pervaporation performance for alcohol dehydration of NaA membrane was obtained, it showed the flux of 2.18 kg/(m2·h) and the water in permeation of 100 % at 60 ℃. Ten generations of NaA zeolite membrane were continuously synthesized by CMSSM, and they all showed analogous morphology, thickness and crystallinity, as well as the pervaporation performance for alcohol dehydration. Therefore, the NaA membrane on cheap ceramic plate support with good reproducibility and prominent pervaporation property could be obtained by CMSSM, which provided technical support for the wide application of NaA zeolite membrane.

Funds：

安徽省科技重大专项（202003c08020001）；浙江省自然科学基金杰出青年科学基金（LR18B060002）；浙江省“万人计划” (ZJWR0108011)；宁波科技创新2025重大专项计划项目(2018B10016，2020Z036)；国家自然科学基金（22006076）。

AuthorIntro：

邓衍宏（1964.10），男，安徽泗县，高级工程师，主要研究方向：酒精生产技术与管理

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