Zhai Mengjin, Wu Mian, Wang Cunying, Li Xiaobing
National Center for Coal Preparation and Purification Engineering Research, China University of Mining and Technology No. 1 Daxue Road, South Xuzhou Jiangsu 221116 PR China
School of Chemical Engineering and Technology, China University of Mining and Technology Xuzhou Jiangsu 221116 PR China.
RSC Adv. 2020 May 19;10(32):18918-18926. doi: 10.1039/d0ra01679a. eCollection 2020 May 14.
The existence of fine-sized oil drops that are difficult to coalesce greatly decreases the separation efficiency of produced water from alkali, surfactant, and polymer flooding technology (ASP) containing oil-in-water emulsions. To improve oil-water separation efficiency, a silica-supported polyether polysiloxane quaternary ammonium (abbreviated as PPQA@SiO) demulsifier was synthesized. The supported demulsifier possesses a rough surface structure and large surface area. In addition, it displays high thermal stability. It was applied for treating the produced water from ASP flooding. The effects of dosage, treatment temperature and treatment time on the oil removal efficiency from ASP produced water were investigated. Owing to the synergetic effect of demulsification and adsorption, the supported demulsifier exhibited an oil removal greater than 92% within 50 min at the initial oil concentration of 300 mg L, which is much higher than that of a commercial demulsifier SA001 (40.33%). Furthermore, the demulsification mechanism was explored from the perspective of the zeta potential, mean diameter and size distribution of the oil droplets. The high oil removal efficiency establishes PPQA@SiO as a promising candidate for oil-water separation from the ASP flooding produced wastewater.
难以聚结的细小油滴的存在极大地降低了含油水乳液的碱、表面活性剂和聚合物驱油技术（ASP）产出水的分离效率。为提高油水分离效率，合成了一种二氧化硅负载的聚醚聚硅氧烷季铵盐（简称为PPQA@SiO）破乳剂。负载型破乳剂具有粗糙的表面结构和较大的表面积。此外，它还具有高的热稳定性。将其应用于处理ASP驱油产出水。研究了用量、处理温度和处理时间对ASP产出水除油效率的影响。由于破乳和吸附的协同作用，在初始油浓度为300 mg/L时，负载型破乳剂在50分钟内的除油率大于92%，远高于商用破乳剂SA001（40.33%）。此外，从油滴的ζ电位、平均直径和尺寸分布的角度探讨了破乳机理。高除油效率使PPQA@SiO成为从ASP驱油产出废水中进行油水分离的有前景的候选者。
