基于环氧树脂交联复配的破乳剂性能评价

Performance Evaluation of Demulsifiers Based on Epoxy Resin Crosslinking

在稠油乳状液的处理领域,化学破乳已经被广泛应用。对四种交联环氧乙烷(EO)和环氧丙烷(PO)破乳的剂性能进行了研究。通过对破乳剂脱水效率测定,界面张力的动态测量等实验,结果表明交联破乳剂的性能与其主体化学结构、环氧支链数直接相关,双亲性嵌段共聚破乳剂在提高脱水效率的同时,对乳状液的界面张力、屈服应力均会有显著影响,随着破乳剂用量加大,乳状液中胶质与水分的比重升高,部分乳状液中的基团开始聚集,限制乳状液中液滴的流动,利于破乳效率的提高。

Chemical demulsification is the most widely used method for treating heavy oil emulsions. In this paper, properties and performance of four ethylene oxide（EO）–propylene oxide（PO） demulsifiers were investigated. The results showed that the performance of the demulsifiers is correlated to the starting base compound, number of EO–PO branches, oil/water interfacial tension（IFT）, increase of molecular weight by incorporation of crosslinks in EO–PO branches and yield stress of emulsions. The yield stress of the emulsions increases on crosslinking the EO–PO block copolymers due to the release of more water and solids, which can increase the number of aggregates present in the emulsion, resulting in increased immobility and constriction and higher yield stress.