膜科学与技术

基于PDA@PVDF膜的非分散溶剂萃取法分离和回收高粘度油

作者：刘萌萌，王建强，丁雅杰，周勇，刘富

单位： 1. 浙江工业大学膜分离与水科学技术研究院，杭州 310014；2. 中国科学院宁波材料技术与工程研究所宁波 315201；3. 中国科学院大学，北京 100049

关键词：油水分离；油回收；非分散溶剂萃取

出版年,卷(期):页码： 2023,43(5):28-36

摘要：

高粘度油分离及其高效回收在油/水分离领域中是一个巨大的挑战。在众多的油水分离方法中，膜分离法被认为是一种最具前瞻性的策略，但油滴引起的膜污染严重地限制了其应用。我们为此提出了一种非分散溶剂萃取策略，使用聚多巴胺修饰的聚偏氟乙烯纳米纤维膜从水包油乳液中有效地回收高粘度的润滑油。研究结果表明，引入的聚多巴胺薄层有助于表面活性剂稳定的油滴通过膜发生吸附和扩散。系统研究了聚多巴胺改性时间、乳液侧和萃取剂侧流速、乳液浓度对油品回收的影响。优化后的膜在10 h内对水中高粘性油表现出1595 g/m2的累计通量，比原始的聚偏氟乙烯纳米纤维膜高出约2倍。这一研究可能会大大推动这种新方法在从油/水混合物中高效分离和回收粘性油方面的应用。

Viscous oil separation and its highly efficient recovery is a great challenge in oil/water separation fields. Among the many oil/water separation methods, membrane separation is considered to be one of the most forward-looking strategies, but membrane fouling caused by oil droplets severely limits its application. We here propose a nondispersive solvent extraction strategy to efficiently recover viscous lubricant oil from emulsions via a polydopamine modified PVDF nanofiber membrane Janus membrane. The incorporated thin polydopamine layer facilitates the adsorption and diffusion of surfactant stabilized oil droplets through the membrane. We studied the influence of polydopamine coating time, the flow rate on both feed and extraction sides, the weight content of lubricant oil on the recovery and separation of oil. The optimized membrane exhibited a 10 h accumulative flux of 1595 g/m2 for viscous lubricant oil in water emulsion, which was twofold higher than the pristine PVDF nanofiber membrane. The current study might significantly advance application of this novel method for highly efficient separation and recovery of viscous oils from oil/water mixtures.

刘萌萌（1998-），女，辽宁葫芦岛人，硕士，从事高粘度油/水混合物分离过程及应用研究，E-mail：liumengmeng@nimte.ac.cn.

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