乳化油电破乳研究进展与物性参数优化

为获取不同物性参数对油水乳状液电破乳效率的联合作用规律,系统分析国内外电破乳油水分离的前沿成果,归纳含水率、温度、无机盐、酸碱等参数对电破乳的作用,并得到优化油水乳状液电破乳分离的物性参数:含水率过大易造成乳状液的电导率发生剧增,统筹考虑油水分离的电能耗,一般将含水率控制在25%为宜;避免升温分散液滴产生电分散,破乳剂达到浊点的影响,以及热负荷增加,油水乳状液的电破乳温度控制在70℃为佳;无机盐能显著降低油水乳状液的稳定性,但过高的含盐浓度,使得乳状液的电导率增加,能耗也有所上升;控制乳状液中固体微粒的粒径不小于几十微米,避免掺混与油湿润角小、具有亲油特性的固体微粒,易于电破乳的进程。

RESEARCH PROGRESS OF ELECTRIC DEHYDRATION FOR OIL-WATER EMULSION AND PARAMETERS OPTIMIZATION OF ITS PHYSICAL PROPERTIES

In order to obtain combined influence of different physical properties of oil-water emulsion on electric dehydration,it was systematically analysed the latest research results at home and abroad of electric dehydration.The rule of moisture content,temperature,mineral salt,pH value and so on was summarized to get optimized physical parameters : Excessive moisture content brings about conductivity of the emulsion rising rapidly,so for reducing the energy consumption,controlling the moisture content being about 25% is advisable;to avoid electrodispersion,cloud point of demulsifier,and heating energy consumption increasing,temperature of electric dehydration at 70℃ is appropriate;mineral salt can significantly reduce oil-water emulsion stability,however excessive salt concentration brings increasing of conductivity of the emulsion and electric energy consumption for demulsification;it encourages the process of electric dehydration by controlling the solid particles size in emulsion less than dozens of microns and avoiding mixing solid particles which have small wetting angle with oil and water-wet behavior.