Behavior of high viscosity oil droplets in oil-water membrane separation and its influencing factors

被引：0
|
作者：
Huo Z. [1 ]
Niu Y. [1 ]
Pan Y. [1 ]
机构：
[1] School of Chemical Engineering, Dalian University of Technology, Liaoning, Dalian
来源：
Huagong Xuebao/CIESC Journal | 2024年 / 75卷 / 06期
关键词：
dissipative particle dynamics; membrane separation; oil droplet behavior; simulation; surfactants;
D O I：
10.11949/0438-1157.20240088
中图分类号：
学科分类号：
摘要：
Membrane separation of heavy oil components in oilfield produced wastewater is an important factor affecting membrane pollution, and the complex oil droplet behavior near the membrane surface directly affects the membrane separation effect under different membrane separation conditions. So it is necessary to study the behavior of high viscosity oil droplets near the membrane surface. Based on experimental results of the physical properties of actual oilfield produced wastewater, the dissipative particle dynamics (DPD) method was used to analyze the behavior of oil droplets by combining the trajectory of high viscosity oil droplets and the interaction energy between oil droplets. The results show that the double oil droplets exhibit two types of behaviors: passing and coalescing. Each can be divided into three behavioral stages: liquid drainage between oil droplets, oil droplet contact, and oil droplet stabilization. The decrease of the distance between double oil droplets and the distance between oil droplets and the membrane surface was conducive to the coalescence of oil droplets, which was conducive to oil-water separation, and the decrease of the distance between oil droplets and the membrane surface would cause the position of oil droplets after collision to be further away from the membrane surface. The presence of surfactants hindered the coalescence of oil droplets and was not conducive to oil-water separation, and ionic surfactants had a stronger hindering effect due to their strong repulsion between hydrophilic heads. The presence of the third oil droplet promoted the coalescence of the double oil droplets, and the degree of coalescence promotion was affected by the collision angle of oil droplets. The research results can provide a basis for the subsequent study of the interaction between oil droplets and separation membranes and the effectiveness of oil-water separation, as well as theoretical support for the setting and technical optimization of membrane oil-water separation conditions. © 2024 Materials China. All rights reserved.
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页码：2262 / 2273
页数：11
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