Abstract

It was shown that methacrylic acid-ethyl acrylate copolymer (P(EA-MAA)) emulsion has a good reverse demulsification performance for treatment of water produced in oilfields. Its polymerization mechanism, kinetics and demulsification mechanism are important for its application and scale-up production. Therefore, they were studied in the research described in this paper. It was found that the demulsification mechanism of P(EA-MAA) was related to the ion compositions of the produced water and the conformation change of P(EA-MAA) when it was dissolved in the produced water. The distributions of monomer and surfactant before the polymerization were investigated and we found that there were both homogeneous nucleation and micellar nucleation during the first stage of emulsion polymerization. The relationships among the polymerization rate (Rp), monomer concentration ([M]), initiator concentration ([I]) and surfactant concentration ([S]) were studied. The emulsion copolymerization kinetic equation was Rp∝[M]0^.64 [I]0^.68 [S]0^.41, which is related with the nucleation mechanism of the polymerization mechanism. In addition, the activation energy was 34.50 kJ/mol.

摘要

结果表明,甲基丙烯酸-丙烯酸乙酯共聚物(P(EA-MAA))乳液在处理油田采出水时具有良好的反破乳性能。其聚合机理、动力学和破乳机理对其应用和放大生产具有重要意义。因此，在本文中描述的研究中对它们​​进行了研究。发现P(EA-MAA)的破乳机理与采出水的离子组成和P(EA-MAA)溶解在采出水中时的构象变化有关。研究了聚合前单体和表面活性剂的分布，发现在乳液聚合的第一阶段存在均相成核和胶束成核。聚合速率（Rp）之间的关系，研究了单体浓度 ([M])、引发剂浓度 ([I]) 和表面活性剂浓度 ([S])。乳液共聚动力学方程为 Rp∝[M]0^.64 [I]0 ^.68 [S]0 ^.41，这与聚合机理的成核机制有关。此外，活化能为34.50 kJ/mol。