the emusion was W/O type and formed by the reaction of a kind of crude oil and a specified concentration NaOH solution, the heating and PH adjustment method had been used to the emulsion breaking but not effective.
Frising, T., Noïk, C. & Dalmazzone, C., 2008. The liquid/Liquid sedimentation Process: From Droplet Coalescence to Technologically Enhanced Water/Oil Emulsion Gravity Separators: A Review. Journal od Fispersion Science and Technology, 7(27), pp. 1035-1057
they show diferent ways to break emulsions of crude oil