Background

Presently, membrane separation technology has been attracting increasing attention in the research and development of waste oil treatment due to its outstanding performance. Oil purification reduces not only the pollution, but also certain economic losses, as well as to alleviate the current situation of resource scarcity.

Methods

The poly (p-phenylene terephthalamide) (PPTA) braided tube reinforced (PBR) PFA hollow fiber membranes (HFMs) with high-temperature and chemical resistance were successfully prepared by dipping coating and thermal sintering technique with no harmful diluent and additives (green preparation).

Significant findings

The morphologies, permeability of PBR-PFA HFMs were investigated by scanning electron microscopy, three-dimensional optical profilometer and filtration experiments, etc. The results indicated that the increased PFA content led to a dense pore structure and enhanced surface roughness. Besides, the increased sintering temperature brought about porous surface with a narrow pore size distribution and tiny average pore size. The membrane exhibited a high-temperature resistance under 60-150 °C operating conditions. Furthermore, it showed excellent chemical resistance after immersing in strong acid and alkali solution. Finally, the membrane's separation efficiency for two-phase oil-water could be up to 98.5 % and the retention rate for waste oil could be 97.6 % above, respectively.

中文翻译：

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耐高温耐化学性聚四氟乙烯-全氟丙基乙烯基醚共聚(PFA)中空纤维膜的结构设计

背景

目前，膜分离技术以其优异的性能在废油处理的研究和开发中越来越受到关注。油品净化不仅减少了污染，还减少了一定的经济损失，同时也缓解了资源匮乏的现状。

方法

采用浸涂和热烧结技术，成功制备出耐高温、耐化学腐蚀的聚对苯二甲酰对苯二胺（PPTA）编织管增强（PBR）PFA中空纤维膜（HFM），不含有害稀释剂和添加剂（绿色制备） ）。

重大发现

通过扫描电子显微镜、三维光学轮廓仪和过滤实验等研究了PBR-PFA HFMs的形貌、渗透性。结果表明，PFA含量的增加导致孔结构致密，表面粗糙度增加。此外，提高烧结温度导致多孔表面孔径分布窄、平均孔径小。该膜在60-150℃的工作条件下表现出耐高温性能。此外，在强酸和强碱溶液中浸泡后，它表现出优异的耐化学性。最终膜对油水两相的分离效率可达98.5%以上，对废油的截留率可达97.6%以上。