Demulsifier is a non-ionic surfactant used for dehydration, which is used to remove water from coal washing plants, sewage treatment plants, etc., to achieve the required water content; Used in oil wells to reduce crude oil viscosity and prevent oil well blockage. In mixtures such as crude oil, due to some solids being insoluble in water, when one or more of these liquids are present in large quantities in aqueous solutions, they can exist in an emulsified state in water under hydraulic or external power agitation, forming an emulsion.