膜科学与技术

耐高温PBI基质子-电子混合传导复合膜的构制及其氢渗透性能研究

作者：高波，范议议，孟秀霞，靳昀，孟波，杨乃涛

单位：山东理工大学化学化工学院，山东淄博255049

关键词：膜分离; PBI;质子-电子混合导体；氢渗透; 耐高温.

出版年,卷(期):页码： 2020,40(6):7-13

摘要：

膜分离是一种成本低、高效、绿色的纯化技术，但以有机物膜在高温环境中由于其分子链的断裂具有较大的挑战。本文以3,3′-二氨基联苯胺（DABz）和间苯二甲酸（IPA）为原料，采用“熔融聚合法”合成了低分子量的可耐高温的聚（2, 2’-(间苯基)-5, 5’-联苯并咪唑）（mPBI）有机膜材料；以异氰尿酸三缩水甘油酯（TGIC）为交联剂，并浸渍磷酸，提供质子传导路径，添加片状石墨作为电子导体，得到质子-电子混合导体mPBI-TGIC/石墨/H3PO4交联复合膜。对交联复合膜进行结构和性能表征，结果表明交联复合膜具有良好的机械性能和抗氧化稳定性。用于H2/CO2混合气体分离，300 °C时，氢气选择性高达100%，渗透量为0.14 mL min-1 cm-2；280 °C时，可稳定运行160 h。这些表明mPBI-TGIC/石墨/H3PO4交联复合膜具有良好的耐高温性，可有望用于工业高温气体的分离。

Membrane separation is a green energy-saving technology for gas separation and purification. Based on 3,3′-diaminobenzidine (DABz) and isophthalic acid (IPA) as raw materials, poly [2, 2 '-(m-phenyl) -5,5'-bibenzimidazole] (mPBI) with low molecular weight is synthesized by the “melt polymerization method”. The mPBI-TGIC/graphite/H3PO4 cross-linked composite membrane is obtained using triglycidyl isocyanurate (TGIC) as cross-linking agent and flake graphite as electronic conductor combining with impregnated phosphoric acid. The structural and performance characterization of the cross-linked composite membrane show that the cross-linked composite membrane has good mechanical properties and anti-oxidation stability. For separation of H2/CO2 mixed gas, the hydrogen selectivity is up to 100%, and the permeation flux is 0.14 mL min-1 cm-2 at 300 °C. The 160 h long-term stability at 280 °C indicates that mPBI-TGIC/graphite/H3PO4 cross-linked composite membrane has good high temperature resistance and applicable for high-temperature hydrogen separation.

作者简介：高波（1992-06 ），男，山东枣庄，硕士，研究方向为膜分离与技术，E-mail：1456757351@qq.com

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