膜科学与技术

自聚微孔聚合物低温碳捕集性能研究

作者：董馨瑶，吉文慧，闫旭焕，李建新，马小华

单位： 1.天津工业大学材料科学与工程学院省部共建分离膜与膜过程国家重点实验室，天津300387

关键词：自聚微孔聚合物；碳捕集；梯形聚合物；PTMSP；低温膜分离

出版年,卷(期):页码： 2021,41(3):44-51

摘要：

膜法CO2捕集是解决当今世界碳排放的一个重要方法，低温膜分离是近年来兴起的一种高效CO2分离技术。本研究结合了自聚微孔聚合物高CO2透过率和低温下聚合物膜材料高CO2/N2选择性的特点来同时获得高CO2透过率以及CO2/N2 选择性的聚合物膜材料。首次探讨了高比表面自聚微孔聚合物PTMSP以及PIM-1在低温下CO2透过率以及CO2/N2的选择性之间的关系和内在影响因素。其中，PTMSP表现出CO2的透过率和CO2/N2的选择性随温度降低而同时增加。在 -30 oC，PTMSP的CO2的透过率为 25492 Barrer, CO2/N2的选择性为34，分离性能远超过最新的2019年上限。同时对其CO2/N2（15/85）混合气的低温（-30 oC）研究表明，混合气中CO2的渗透率在20000 Barrer以上， CO2/N2选择性约为32，是到目前为止最优秀的碳捕集膜材料之一。以上研究显示了PIM 材料在低温下具有良好的碳捕集应用潜力。

Carbon capture is a critical problem all over the world. Sub-ambient temperature membrane-based separation technique is one of the promising methods to solve the CO2 capture and storage problems recently developed. In this work, we combined the highly CO2 permeable polymer of intrinsic microporosity and the low temperature technique to achieve polymer membranes with both high CO2 permeability and CO2/N2 selectivity for the first time. Highly porous PIM-1 and PTMSP were adopted for evaluation their sub-ambient temperature properties. Surprisingly, PTMSP demonstrated simultaneously increased CO2 permeability and CO2/N2 selectivity upon decreasing temperatures. At -30 oC, the PTMSP demonstrated a CO2 permeability of 25492 Barrer and CO2/N2 selectivity of 34, which is by far higher than the latest 2019 trade-off curve. Additionally, the CO2/N2 (15/85) mixed-gas demonstrated a CO2 permeability of ~20000 and CO2/N2 selectivity of 32, which is one of the best CO2 separation membranes ever reported. The using of PIMs at low temperature for CO2 separation showed great perspective in carbon capture and storage.

董馨瑶（1999-），女，黑龙江佳木斯人，本科

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