Research on the relationship between structure and demulsification property of polyether crude oil demulsifier

With stearyl alcohol,propylene glycol,tetraethylenepentamine,polyethylene polyamine,phenolic resin and phenol-amine resin as the initiator respectively,a series of polyether demulsifiers were synthesized.The initiator,branch degree,the ratio of m(EO)/m(PO),the relationship between block structure and dehydration of the demulsifiers were investigated.The results showed that Tahe oilfield in Xinjiang,synthesis of multi-branched polyether demulsifier has higher dehydration rate;the polyether demulsifier with 0.3% ~ 1.5% phenolic resin and when the ratio of HLB of polyether demulsifier is in the range of 9.5 ~ 11.5,it shows good demulsification property;the polyether demulsifiers with two blocks and end of PEO block show fast dehydration speed,high dehydration rate;the polyether demulsifiers with more blocks shows slower dehydration speed and low oil content of waste water.