화학공학소재연구정보센터
Separation Science and Technology, Vol.29, No.2, 159-170, 1994
Demulsification of Water-in-Oil Emulsions by Use of a High-Voltage AC Field
The demulsification kinetics of water-in-oil (W/O) emulsions in a high ac electric field was investigated by using a batch cylindrical-demulsifier. The oil phase was liquid paraffin containing 1-10 wt% SPAN80 or ECA4360 as surfactant. The aqueous phase was deionized water containing 0-40 wt% H(2)S0(4) solution. The rate of demulsification was studied experimentally. The effects of emulsion structure and properties (water drop size, aqueous-phase electrolyte concentration, surfactant concentration, surfactant type) and demulsifying conditions (applied voltage, distance between electrodes) on demulsification rates are discussed. An empirical correlation is presented for estimation of the demulsification rate of W/O emulsions in a high ac electrostatic batch demulsifier.