Abstract In this work, we investigated the use of a polydecylmethylsiloxane composite membrane as pre-concentrator unit for the separation of CO2 from flue gas streams. The separation properties of the tailor-made membrane were evaluated with both a ternary gas mixture (CO2:N2:O2 = 15:80:5) and pure gases (CO2, N2, O2) at different temperatures (25, 50 °C) and trans-membrane pressure differences (1–6 bar). The membrane exhibited a high permeability close to 1000 barrer, and a moderate CO2/N2 selectivity of 8.7. The results obtained in mixed gas conditions revealed a certain reduction of CO2 and O2 permeability with respect to pure gas, whereas the presence of water vapour did not induce significant changes to mass transport properties. Performance maps were thus developed for better understanding whether and in which conditions the membrane developed in this work can be suitable to be used as pre-concentrator.

中文翻译：

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使用聚癸基甲基硅氧烷复合膜从加湿的三元气体混合物中分离 CO2

摘要 在这项工作中，我们研究了使用聚癸基甲基硅氧烷复合膜作为预浓缩器从烟道气流中分离 CO2 的情况。在不同温度 (25, 50 °C) 下使用三元气体混合物 (CO2:N2:O2 = 15:80:5) 和纯气体 (CO2、N2、O2) 评估了定制膜的分离性能和跨膜压差 (1–6 bar)。该膜表现出接近 1000 barrer 的高渗透性和 8.7 的中等 CO2/N2 选择性。在混合气体条件下获得的结果表明，相对于纯气体，CO2 和 O2 渗透率有一定的降低，而水蒸气的存在不会引起传质特性的显着变化。