from crude oils. One of these techniques is coalescence of The electrically induced coalescence of water-in-oil emulsions the water droplets induced by the application of high electric stabilized by interfacially active fractions from crude oils has been field. The application of high electric fields to emulsified studied by means of time domain dielectric spectroscopy at high systems has been utilized since the pioneering work by Cotelectric fields. The experiments were designed with a 2 7-3 reduced trell in 1907 (1). The first commercial electrical coalescers factorial design. Regression analysis clearly shows that the choice were established at a production field in 1909, and Cottrell's of organic solvent and the amount of asphaltenes, as well as the first patents were granted in 1911 (2, 3). Ever since then interplay between these variables, are the most significant paramenumerous improvements have been presented, resulting in a ters for determining the stability of these emulsions. It should be pointed out that the asphaltenes were the only surface active frac-multitude of patents. Much effort has been focused on the tion tested. No interplay between, for instance, asphaltenes and design of new coalescers, in order to obtain optimal condiresins was investigated. The nonlinearity found in the regression tions for the resolution of the dispersed water, with respect analysis is explained by different aggregation states of asphaltenes to the electric field, such as pulse frequency and electric in aliphatic and aromatic solvents. The influence of the variables field intensity. However, few works are directly related to upon the emulsion stability is discussed.