| In this paper, hyperbranched macromolecules were prepared by amidation condensation reaction and Michael addition. Octylamine, laurylamine and cetylamine were used as nucleus and then reacted with methyl acrylate and ethylenediamine respectively. 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 the hyperbranched macromolecules as initiator. The performance of the macromolecules and the demulsifiers were also studied.The solubility, surface tension and demulsification property of macromolecules were studyed. 1.0G products all have high water solubility, while 0.5G products dissolves well in non-polar solvents. R12-1.0G and R16-1.0G have satisfying surface activity. A 60min dehydration rate of 91.7% was observed at 50℃and dosage 100mg/L for R12-1.0G.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 with the increasing of alkyl chain length and the decreasing of EO content, the cloud point and the water number decreased, the HLB value increased.In addition, the demulsification of these Broome-type demulsifiers in emulsions was studied by the bottle testing method. In W/O emulsion, demulsifiers with high EO content had better demulsification effect: A 120min dehydration rate of 85% and 98% was observed at 50℃and dosage 225mg/L for R8-40 and R12-40 respectively; in O/W emulsion, with the increasing of EO content, the flowing time and half time decreased, and cracking rate constent and demulsification performence increased.
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