The Design And Synthesis Of Multiple Branches Polyether And Demulsification Mechanism

Phenol-amine resin was prepared by condensation reaction of Bisphenol A, diethylenetriamine and formaldehyde. Polyether demulsifiers with different EO content and ratio of initiator to PO were synthesized through reactions with different proportions of propylene oxide and ethylene oxide using phenol-amine resin as initiator. The performance of these demulsifiers was also studied.The surface tension of these polyether demulsifiers was measured by the Spinning Drop Tensiometer. Then we measured the cloud points and water number of all these demulsifiers, and the HLB value of them was calculated by the cloud point method. The results showed that the cloud point and the HLB value of the polyethers decreased with the increasing ratio of initiator to PO and the decreasing of EO content; and the water number of the polyethers increased with the increasing ratio of initiator to PO and the decreasing of EO content.In addition, the demulsification of these demulsifiers in W/O emulsion was studied by the bottle testing method. The best PAE80 and PAE100 demulsifier was selected and the effects of demulsifier dosage, temperature and time on the demulsification performance were studied and compared with SP169. A 120min dehydration rate of 95% and 91% was observed at 40℃and dosage 20mg/L for PAE84 and PAE104 respectively; the data of SP169 was 42% at the same condition.