膜科学与技术

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Effect of annealing pretreatment on the structure and properties of carbon molecular sieve hollow fiber membranes

Authors： ZHANG Xianglong, SHENG Lujie, LI Hui, XU Changyang, REN Jizhong

Units： 1. National Laboratory of Clean Energy, Dalian Institute of Chemical Physics, Dalian 116023, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China 3. National Engineering Research Center of Membrane Technology, Dalian 116023, China

KeyWords： Carbon membranes have excellent thermal stability, chemical stability and gas separation performance. In this study, polyimide hollow fiber membranes were used as precursors to prepare high performance carbon molecular sieve hollow fiber membranes by annealing pretreatment (250°C, 300°C and 350°C) near the Tg. The effects of annealing conditions on the structure and gas separation performance of polyimide-based carbon membranes were investigated. The results showed that the structure of carbon molecular sieve hollow fiber membranes became denser with the annealing temperature increasement, while the selectivity of CO2/CH4 and H2/CH4 increased and the permeability decreased. Especially when the annealing temperature was 350℃, the selectivity of CO2/CH4 and H2/CH4 increased by 98% and 195%, respectively. Simultaneously, the effect of permeation temperature and pressure on gas separation performance was studied. HIM (Helium ion electron microscope), FTIR and XRD were used to characterize the morphology of carbon membranes prepared under different pretreatment conditions.

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(4):110-117

Abstract：

s to prepare high performance carbon molecular sieve hollow fiber membranes by annealing pretreatment (250°C, 300°C and 350°C) near the Tg. The effects of annealing conditions on the structure and gas separation performance of polyimide-based carbon membranes were investigated. The results showed that the structure of carbon molecular sieve hollow fiber membranes became denser with the annealing temperature increasement, while the selectivity of CO2/CH4 and H2/CH4 increased and the permeability decreased. Especially when the annealing temperature was 350℃, the selectivity of CO2/CH4 and H2/CH4 increased by 98% and 195%, respectively. Simultaneously, the effect of permeation temperature and pressure on gas separation performance was studied. HIM (Helium ion electron microscope), FTIR and XRD were used to characterize the morphology of carbon membranes prepared under different pretreatment conditions.

Funds：

国家重点研发计划（2020YFC0862900）

AuthorIntro：

张相龙（1993-），山东高密人，硕士研究生，主要从事聚酰亚胺基炭膜的气体分离研究

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