Design Synthesis And Demulsiifcation Performance Of Cardanol Based Polyethers

A kind of novel cardanol phenol-amine resin was synthesized using cardanol,formaldehyde and polyethylene polyamine as raw materials on the basis of analysis oftraditional demulsifiers structures. Then a series of novel block polyether demulsifiers withdendritic, high-branched and cardanol-based phenol-amine resin structures were synthesizedusing cardanol phenol-amine resin as initiator, KOH as catalyst under the conditions of120-140℃,(0.25±0.05)MPa through polymerization reaction with EO and PO.The influences of structure on their surface activity and hydrophilicity were determinedby drop volume method and visual method, the results showed that the cmc and γcmcincreasedwith the increase of molar ratio of cardanol phenol amine resin to PO and the decrease of EOcontent, whereas, cloud point and HLB value go down. The results of thermodynamicscalculation indicated that the micellization of CPAE in aqueous solutions is spontaneous andentropy driven. The contribution of entropy change to the change in Gibbs free energy tendsto decrease but the contribution of enthalpy change to the change in Gibbs free energy tendsto increase. The micellization is enthalpy entropy compensated. The compensationtemperature (Tc) is found to be (300±2) K. The formation ability and the stability of themicelles increase when the content of EO decreases.The demulsification performance of CPAE were determined by bottle method, the resultsshowed that, under the conditions of40℃,120min and100mg/L, the dewatering rates ofCPAE reach above95%. Furthermore, the demulsification performance of tri-block polyetheris better than that of diblock polyether. Single drop method was used to study the liquidmembrane intensity, flowing time and half-life time, and the change law of cracking rate isconsistent with demulsification performance. And with the increase of concentration of CPAEand the decrease of EO content, the the flowing time and half time decreased, and crackingrate constent increased. The effect of alkali, surfactant and polymer on kinetic parameters wasstudied systematically. The result showed that each component had influence ondemulsification. This work will provide opportunites for many fundamental studies to preparenovel cardanol based demulsifiers.