Abstract: Demulsification are necessary tools for separation of oil and aqueous phase in emulsions. In view of thermodynamics, emulsions are instable and demulsification is inevitable. Different demulsification methods just lead to different separation performances and time of oil and aqueous phase. The conventional demulsification methods contain thermal, centrifugal, shearing, electrical and chemical demulsification. Among them, centrifugal, electric/electro and chemical demulsification are the most frequently used demulsification methods. With the development of demulsification technologies, some novel demulsification methods have appeared in succession which include microwave, ultrasonic, membrane, magne-tic nanoparticle, microchannel, cavitation water jet, and oxidation demulsification. Among them, microwave, membrane and magnetic nanoparticle demulsification show broad development prospect due to their advantages of simple process and high demulsification efficiency. However, they are in experimental phase now and are not able to realize the widespread industrialization application owing to immature technologies. In order to solve the problems of weak demulsification performance, some hybrid demulsification technologies such as integration of magnetic nanoparticle and microwave, electric field and fiber bed, electric and centrifugal field, electric field and microfiltration membrane, and ultrasonic and microwave have appeared.At present,demulsification technologies develop towards green,environmental protection,energy-saving,high efficiency,money-saving,diversification and coupling technologies.
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