Effect of oil phase transition on freeze/thaw-induced demulsification of water-in-oil emulsions

Langmuir : the ACS Journal of Surfaces and Colloids
Chang LinYuanFa Liu

Abstract

Recently, there has been an increasing interest in the breakage of water-in-oil (W/O) emulsions by the freeze/thaw method. Most of the previous works focused on the phase transition of the water droplet phase. This paper emphasizes the effect of continuous oil phase transition. A series of oils with different freezing points were used as oil phases to produce model emulsions, which were then frozen and thawed. The emulsion whose oil phase froze before the water droplet phase did (OFBW) on cooling was readily demulsified with a dewatering ratio as high as over 80%, but the emulsion whose oil phase did not freeze when the water droplet phase did (NOFBW) was relatively hard to break. The difference in demulsification performance between them resulted from the distinction between their demulsification mechanisms via the analyses of the emulsion stability, emulsion crystallization/melting behaviors, oil phase physical properties, and wettability of the frozen oil phase, etc. For the OFBW emulsion, the first-frozen oil phase was ruptured by the volume expansion of the subsequently frozen droplet phase, and meanwhile, some liquid droplet phase was drawn into the fine gaps/crevices of the frozen oil phase to bridge droplets, which were...Continue Reading

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Citations

Aug 28, 2013·Journal of Hazardous Materials·Guangji HuGuangming Zeng
Dec 21, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Yutaka TakahashiPieter Stroeve
Aug 18, 2009·Journal of Colloid and Interface Science·S Ghosh, D Rousseau
Aug 1, 2016·The Journal of Chemical Physics·W J SmitH J Bakker
Aug 12, 2015·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Tae-Soon Kwon, Jae-Young Lee
Nov 9, 2018·Journal of Oleo Science·Soek Sin Teh, Siau Hui Mah
Feb 26, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Yan LiLinqi Shi
Aug 31, 2017·ACS Omega·Saranyoo SornkamnerdTatsuo Kaneko

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