Organomodified silicones, which are used as effective demulsifying agents, are generally based on a polysiloxane backbone with polyether or other organic substitutions attached to it. A new silicone-based demulsifier was synthesized that contains polyether in the backbone and silicon-containing substituents. Interfacial tension (IFT) measurements with a model oil system showed that the new material has better interfacial activity (~5mN/m) than the traditional structures (10-14mN/m). This low interfacial tension can be one of the important parameters for coalescence of water drops in water-in-crude oil emulsions. Bottle tests with crude oil emulsions confirmed that the new demulsifier also can provide better demulsification performance with faster water drop and lower bottom solids and residual water in the dehydrated crude after demulsification.

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