In this paper, an ionic liquid demulsifier (MDBr-IL) with double cationic centers and multiple hydrophobic chains was synthesized with N,N,N,N,-tetraglycidyl- 4,4-diaminodiphenylmethane as starting materials. The structure of MDBr-IL was characterized by Fourier transform infrared spectrometer (FT-IR) and ¹H nuclear magnetic resonance spectrometer (¹H NMR). Effect of a few key factors such as concentration, demulsifying time, demulsifying temperature, salinity and pH value on the demulsifying efficiency (DE) was detailly researched in a water-in-crude oil emulsion. When the concentration of MDBr-IL was 500 mg/L, the DE reached 95.24% at 60 ℃ for 180 min. Also, the DE could increase to 98.64% when the demulsifying temperature was 70 ℃. In addition, MDBr-IL had an eminent resistance to acid, alkali and salt. Also, the salinity could further improve the demulsification performance. Interfacial properties and wettability were employed to investigate the possible demulsification mechanism. It demonstrated that MDBr-IL is a viable demulsifier for the separation of oil-water emulsions.

本文以N,N,N,N,-四缩水甘油基-4,4-二氨基二苯基甲烷为起始原料，合成了具有双阳离子中心和多疏水链的离子液体破乳剂(MDBr-IL)。MDBr-IL的结构通过傅里叶变换红外光谱仪(FT-IR)和¹ H核磁共振光谱仪( ¹核磁共振）。在原油包水乳液中，详细研究了浓度、破乳时间、破乳温度、盐度和pH值等几个关键因素对破乳效率（DE）的影响。当MDBr-IL浓度为500 mg/L时，60 ℃ 180 min时DE达到95.24%。此外，当破乳温度为70℃时，DE可提高到98.64%。此外，MDBr-IL 具有出色的耐酸、碱和盐性能。此外，盐度可以进一步提高破乳性能。采用界面特性和润湿性来研究可能的破乳机制。它表明 MDBr-IL 是一种可行的油水乳液分离破乳剂。