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.
分类号: TQ028.2+1
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.

基金项目:
国家自然科学基金(21776165, 21878179, 21978157)和山东省自然科学基金(ZR2019MB056).

作者简介:
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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