Salt influence the quality of crude oil and equipment.Branch-composite polyether derivative is studied which forms reverse micelles in non-polar continuous phase.With the advantage that the pool in reverse micelles can dissolve polar materials
water-soluble impurities and salt can be separated from crude oil.The branch-composite polyether derivative can reduce the surface tension of high-salinity water and its salt-resistance is up to 200000 mg·L-1.Thus it can be used in salinity water washing. Moreover
the branch-composite polyether derivative can inhibit the corrosion of metal in salt water effectively.