Abstract The removal of small molecular weight impurities via organic solvent nanofiltration is urgently needed. 9,9-bis(4-hydroxyphenyl)fluorene (BHPF) was modified to synthesize a novel nitrogen-containing heterocyclic monomer (mBHPF). Microporous polyarylate thin-film composite (TFC) membranes of trimesoyl chloride and mBHPF were prepared via interfacial polymerization. The enhanced microporosity and hydrophilicity were achieved by using nitrogen-containing heterocyclic building blocks. Rejections to dyes with a molecular weight greater than 700 remained remarkable (over 98%) in methanol while the permeances of methanol, ethyl alcohol and acetone improved to 14.49, 4.57 and 10.06 L m−2 h−1 bar−1, respectively, much higher than the typical-used commercial membranes, such as MPF-44 or MPF-50 from Koch. Moreover, based on physical properties of solvents and the structure of polyarylate membranes, a model that had great potential in the prediction of pure organic solvent flux was established. This method provides ways to form microporous TFC membranes and predict separation performance for organic solvent nanofiltration.

中文翻译：

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含氮杂环微孔聚芳酯膜增强有机溶剂纳滤分离性能

摘要 迫切需要通过有机溶剂纳滤去除小分子杂质。9,9-双（4-羟基苯基）芴（BHPF）经修饰合成新型含氮杂环单体（mBHPF）。通过界面聚合制备均苯三甲酰氯和 mBHPF 的微孔聚芳酯薄膜复合 (TFC) 膜。通过使用含氮杂环结构单元来实现增强的微孔率和亲水性。在甲醇中对分子量大于 700 的染料的排斥仍然显着（超过 98%），而甲醇、乙醇和丙酮的渗透率分别提高到 14.49、4.57 和 10.06 L m-2 h-1 bar-1，大大提高高于典型使用的商业膜，例如来自 Koch 的 MPF-44 或 MPF-50。而且，基于溶剂的物理性质和聚芳酯膜的结构，建立了一个在纯有机溶剂通量预测方面具有巨大潜力的模型。该方法提供了形成微孔 TFC 膜和预测有机溶剂纳滤分离性能的方法。