Particulate separations by electrostatic coalescen

专利名称：Particulate separations by electrostatic

coalescence

发明人：Sheng-Ming B. Chi,Robin R. Oder申请号：US07/277018申请日：19881128公开号：US05147045A公开日：19920915

摘要：The use of electrostatic demulsification methods to separate fine particulatesof differing surface characteristics is disclosed. In one example, particles of hydrophobiccoal and hydrophilic kaolin clay, each of nominal 3.5 micron mass mean particle diameter,were separated from a variety of stable water-in-oil emulsions. 50/50 blends of coal of4% ash and kaolin clay of 86.5% ash were used in the experiments. A variety of oils, waterconcentrations, solids concentrations, and emulsifiers have been used in this work.Externally applied electrostatic fields up to 1.2 kV/cm were used. Greater than 90%rejection of kaolin particles into the separated water phase was achieved with virtuallycomplete recovery of the coal particles uniformly suspended in the oil phase. Underconditions resulting in the most efficient separation, we have observed that the coalescedwater phase appeared as intertwined cylindrical tubes extending between electrodes, asopposed to nonconnected and chained droplets which have been reported by others.The fine kaolin particulates were observed to be water-encased while most coal particlesremained dispersed in the oil continuum.

申请人：EXPORTECH COMPANY, INC.

代理人：Michael J. Kline

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