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Preparation of polyetherimide hollow fiber membranes and
its performance in hydrogen production

Authors： YANG Fei1， ZHANG Yuanyuan1， WANG Chao1， YANG Yang2， CUI Jing2， ZHANG Yue1， ZHANG Yumei1

Units： 1. State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620， China; 2. SINOPEC Shanghai Research Institute Of Petrochemical Technology Co., Ltd., Shanghai 201208， China

KeyWords： polyetherimide; hollow fiber membrane; rheological properties; spinnability; gas separation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2025,45(3):88-98

Abstract：

In order to prepare hydrogen-producing PEI hollow fiber membranes with high H2 flux and H2 selectivity, in this paper, polyetherimide (PEI) solutions with mass fractions in the range of 20% to 40% were prepared using N-dimethylpyrrolidone (NMP) as the solvent, and the viscosity was too low to be favorable for spinning when the PEI mass fraction was lower than 25%; However, when the PEI mass fraction was from 30% to 40%, the zero-shear viscosity increased exponentially with the increase in concentration, and the lnη0 and 1 000/T relationship deviated from the linear relationship at 20 ℃. Therefore, the spinning temperature was increased to 50 ℃ to improve the spinning liquid fluidity and spinnability. Through spinning experiments, it was found that the strength of PEI hollow fiber membranes increased from 17.14 MPa to 29.95 MPa as the PEI mass fraction increased from 25% to 40%, and testing PEI hollow fiber membranes with PEI mass fractions ranging from 30% to 40% revealed that the separation coefficient of H2/CH4 could be increased from 1.93 to a maximum of 6.69, but the gas flux decreased dramatically, with the H2 flux decreased from 178.12 GPU to 6.56 GPU; Silicone rubber coating of 30% PEI hollow fibre membranes improved the H2/CH4 separation coefficient to 12.55. Rheological studies showed that the addition of non-solvents with a mass fraction of more than 14% to the PEI solution would cause the solution to be in an unstable state, and when the mass ratio of PEI/NMP/THF/EtOH was 30/56/8/6, the H2/CH4 separability was up to 42.30, indicating that the PEI hollow fibre membrane has excellent hydrogen production performance.

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AuthorIntro：

杨飞（2000-），男，江苏淮安人，硕士研究生，主要从事聚酰亚胺类中空纤维膜的制备和性能研究.

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