油水乳化液在复合疏水网膜上破乳与分离实验研究

Experimental research on demulsification and separation of emulsified oil-water mixture on composite hydrophobic mesh films

油水分离对于采油、炼油,以及含油废水的处理有着重要的意义.以不锈钢丝网为基底,采用喷涂-高温塑化的方法复合聚苯硫醚-聚四氟乙烯(PPS-PTFE)涂层,得到了表面形态不同的复合网膜.采用扫描电镜、接触角测量仪等设备对其表面形态与疏水性进行了表征.具有立体纤维网状结构的破乳网膜对乳化液具有良好的破乳效果,从而使乳化油转化为分散油和浮油,然后由超疏水油水分离网膜对油水混合物进行多级分离,达到油水分离的目的.实验过程对不同操作条件下的油水分离效果进行了研究,在优化的操作条件下,经五级分离,出口水中油含量可降至25mg/L,良好的分离效果为超疏水油水分离网膜今后的应用奠定了基础.对破乳分离机理进行了简要分析.

Oil-water separation is of great significance for oil mining and refining,and for the treatment of oily wastewater.Taking stainless steel mesh as substrate,a composite mesh film with different surface morphologies is made by spraying-plasticizing method to compound polyphenylene sulfite（PPS）and polytetrafluoroethylene（PTFE）coating.The surface morphology is studied by scanning electron microscopy. Water contact angle is measured by contact angle measuring instrument.The demulsification mesh film with cubic fiber mesh structure has a good effect on changing the emulsified oil to disperse and floating oil.Then,super-hydrophobic oil-water separation mesh film is adopted to deal with the mixture to separate oil and water.The experimental results show that this kind of mesh film has good separation effect on a mixture of oil and water in different separation conditions. Under optimized operating conditions,through five-stage separation,oil content in retentate water can be reduced to 25mg/L,which lays a foundation for the application of this kind of super-hydrophobic oil-water separation mesh film.Finally,separation and demulsification mechanisms are briefly analyzed.