The poly(propylene oxide)-poly(ethylene oxide) triblock polyether with seven branches(AE73) was synthesized by anionic polymerization and its demulsification for crude oil emulsion and aggregation behavior at oil/water interface were investigated in the presence of different inorganic salts. The influence mechanism of inorganic salts on the demulsification of AE73 for crude oil emulsion was studied by interfacial tension, cloud point and interfacial dilational rheology measurements. The results show that the demulsification of AE73 is enhanced in the presence of the “salting in” ions and decreased in the presence of “salting out”ions. The rate of dehydration becomes good with increasing of temperature, but the quality of dehydrated water is best at 45 ℃. This study may provide useful data for the selection and application of chemicals used in gathering and transportation of crude oil.%通过阴离子聚合反应合成了一种七支状聚氧丙烯/聚氧乙烯( PPO/PEO)三嵌段聚醚；考察了不同无机盐存在时对原油乳状液的破乳效果的影响；通过界面张力、浊点和界面膨胀流变性的测定探讨了其界面聚集行为和破乳作用对无机盐的依赖性。结果表明，盐溶型无机离子存在时，能提高聚醚的破乳效果，而盐析型无机离子存在时，不利于聚醚的破乳作用；温度升高破乳速度加快，但45℃时脱出的水质最清。
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