膜科学与技术

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Study on vapor permeation separation of ethanol/carbon dioxide by polydimethylsiloxane membrane

Authors： SHI Xinyu, XIE Wenwen, MAO Heng, WANG Tao,CHEN Xinru, QI Hao, HU Xiaoxue, ZHAO Zhiping

Units： School of chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, China

KeyWords： vapor permeation; PDMS; composite membrane; fernentation exhaust gas; ethanol recovery

ClassificationCode：TQ028；O634.4+1

year,volume(issue):pagination： 2024,44(2):29-36

Abstract：

During the production of bioethanol, the generation and emission of fermentation tail gas have a significant impact on ecological environment. In this study, the PDMS/PVDF composite membranes suitable for the vapor permeation (VP) separation of ethanol from CO2 were prepared by casting the polydimethylsiloxane (PDMS) separation layer upon the polyvinylidene fluoride (PVDF) porous substrate. The microstructures of PDMS/PVDF composite membranes were systematically characterized by FTIR, XRD, and SEM. The effects of thermal crosslinking time, feed pressure, ethanol concentration, feed temperature, and sweep gas flow rate on the separation performance of the PDMS/PVDF composite membranes were explored. The results showed that the dense and homogeneous PDMS separation layer about 10.5 μm was successfully prepared. Longer thermal crosslinking time led to lower selectivity and higher ethanol permeability. The higher feed pressure resulted in higher ethanol permeability and membrane selectivity. As the feed ethanol concentration increased, the ethanol permeability and selectivity first increased and then decreased. Higher feed temperature resulted in lower ethanol permeability and selectivity. Higher sweep gas flow rate led to a trend of first increased and then decreased of ethanol permeability and selectivity. The as-prepared PDMS/PVDF composite membrane achieved an ethanol permeability of 33052.2 Barrer and the selectivity of 17.1 in separating 0.1 %(volume fraction) ethanol/CO2 system under 0.15 MPa (gauge pressure) at 35℃, and remained a stable separation performance after 60 hours of testing. Therefore, the PDMS/PVDF composite membrane exhibits great application potential in the treatment of tail gas from bioethanol fermentation.

Funds：

国家重点研发计划课题（2021YFC2101203）、国家自然科学基金项目（21736001和22008008）及北京理工大学青年教师学术启动计划资助

AuthorIntro：

石新宇（1999- ），男，河北邢台人，硕士研究生，主要从事气体分离膜与膜组件研究

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