Interfacial Dilational Rheology of Polyether Demulsifiers

doi:10.7503/cjcu20180605

Abstract

Abstract:

The interfacial tension and dilational rheological properties between polyether demulsifiers with different structures and kerosene were investigated by means of oscillating drop method. The experimental results show that four types of polyether demulsifiers have good abilities in reducing interfacial tension. The demulsifier with straight-chain reduces interfacial tension dramatically at low concentration because the demulsifier with low branched permits closer packing. The slow relaxation process dominates the nature of interfacial film due to larger molecular size of demulsifier. Therefore, all interfacial films of four polyether demulsifiers appear strongly elastic nature. At the same time, the flexible ethylene oxide chains and propylene oxide chains have a big influence on the properties of interfacial film: highly branched of polyether demulsifier enhances the molecular interaction, which results the increase in the elastic nature of film and the decrease of dilational viscosity.

Key words: Polyether, Demulsifier, Dilational elasticity, Dilational viscosity, Interface

CLC Number:

O647

TrendMD:

LI Haocheng, GAO Yuan, XIN Yingchun, ZONG Hua, LIU Huiying, ZHANG Lei, ZHANG Lu. Interfacial Dilational Rheology of Polyether Demulsifiers[J]. Chem. J. Chinese Universities, 2019, 40(4): 809.

Figures/Tables 7

Fig.1 Structures of polyether demulsifiers

Fig.2 Dynamic interfacial tensions of propylene glycol polyether(A) and the effect of concentration on interfacial tension between polyether demulsifiers(B)

Fig.3 Effect of frequency on interfacial dilational elasticity for polyether demulsifiers

Fig.4 Slopes of lg|εr|-lgω curves for polyether demulsifiers with different structures

Fig.5 Effect of frequency on interfacial dilational viscosity for polyether demulsifiers

Fig.6 Effect of concentration on interfacial dilational elasticity for polyether demulsifiers(A) Propylene glycol polyether at different frequencies; (B) different demulsifiers at 0.1 Hz.

Fig.7 Effect of concentration on interfacial dilational viscosity for polyether demulsifiers(A) Propylene glycol polyether at different frequencies; (B) different demulsifiers at 0.1 Hz.

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