4.7 Article

Dynamic demulsification of oil-in-water emulsions with electrocoalescence: Diameter distribution of oil droplets

期刊

出版社

ELSEVIER
DOI: 10.1016/j.seppur.2020.117631

关键词

Oil-in-water emulsions; Electrostatic coalescence; Pulsatile electric field; Droplet size distribution; Oil removal

资金

  1. SINOPEC Research Projects (Demulsification of Produced Water with Electro Field Technology)
  2. project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality [IDHT20170507]
  3. Beijing Municipal Education Commission [KZ202010017026]
  4. Beijing Municipal Natural Science Foundation [KZ202010017026]

向作者/读者索取更多资源

This study investigated the feasibility of electrostatic demulsification for O/W emulsions, focusing on enhancing demulsification efficiency by adjusting parameters such as voltage, frequency, water content, and retention time. Results showed that applying a pulsed electric field was an effective technology for promoting the coalescence of emulsified oil droplets, leading to improved oil separation efficiency.
The oil-in-water (O/W) emulsions, especially oily wastewater from EOR oilfield, generally contain small oil droplets in the continuous water phase, which is difficult to be removed with conventional oil separation process such as precipitation, flotation. The electrostatic coalescence is a promising pretreatment step to induce the oil droplets coalescence and promote the oil separation efficiency of conventional methods. In order to explore the feasibility of electrostatic demulsification for O/W emulsions, the influence of operating parameters including electric voltage, pulsatile frequency, water content of emulsions and hydraulic retention time (HRT) on oil diameter distribution of the emulsions were studied using dynamic demulsification experiment. The volume percentage of oil droplets with a diameter exceeding 40 mu m (denoted as DG40) was adopted as the main indicator of demulsification results, it increased from 0 (the original emulsions) to 65.62% (the treated emulsions) at the optimal operation parameters including water content of emulsions 90 vol%, electric voltage 150 V, pulsatile frequency 1000 Hz, duty cycle ratio 0.5, hydraulic retention time (HRT) 60 s. Furthermore, the water separation efficiency for emulsions reached 82.5% at 11 min of the dynamic experiment duration. The results of this study showed that applying pulsatile electric field could be a feasible and effective technology for emulsified oil droplets coalescence in O/W emulsions.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据