Magnetically recyclable polydopamine-polyquaternium modified Fe3O4 nanoparticles for demulsification of asphaltene-rich ASP flooding produced water
Magnetically recyclable polydopamine-polyquaternium modified Fe3O4 nanoparticles for demulsification of asphaltene-rich ASP flooding produced water
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DOI：
10.1016/j.jwpe.2023.104460
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发表时间：
2023-12
影响因子：
7
通讯作者：
Hao Sun;Xiaoqing Li;Xiaobing Li
中科院分区：
文献类型：
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作者：
Hao Sun;Xiaoqing Li;Xiaobing Li
富沥青质碱性-表面活性剂-聚合物（ASP）驱采出水具有界面稳定性高、二次乳化严重的特点，给破乳工艺带来很大困难。这导致迫切需要开发有针对性和高效的破乳剂。本研究制备了一种集电中和、界面吸附和磁聚集功能于一体的聚多巴胺-聚季铵盐修饰Fe3O4（PQA-PDA@Fe3O4）纳米粒子。首先，通过一系列分析技术对PQA-PDA@Fe3O4demulsifier的结构和表面性质进行了系统表征，揭示了其核壳、亲水性和正电荷特性。用PQA-PDA@Fe3O4to处理含500 mg/L乳化油的采出水，200 mg/L的破乳率可达90.5%。结果表明，PQA-PDA@Fe3O4nanoparticles可以将细小的油滴凝聚成大而致密的团聚体，分形维数升高。通过监测界面性能（界面张力、zeta电位和界面膜弹性模量）的变化，进一步探讨破乳机理。PQA-PDA@Fe3O4nanoparticle可以自发迁移到油水界面，重新组装松散的界面膜，从而导致油滴的不稳定和聚集。值得注意的是，PQA-PDA@Fe3O4nanoparticles之间的磁力明显加速了油滴的聚集，抑制了二次乳化过程，从而达到了优异的破乳效果。此外，PQA-PDA@Fe3O4nanoparticle表现出可接受的磁性可回收性。这些结果为富沥青质三元复合驱乳状液的破乳提供了一种有效的替代方案。
The asphaltene-rich alkaline-surfactant-polymer (ASP) flooding produced water has been identified with high interfacial stability and severe secondary emulsification, which poses great difficulties in its demulsification process. This leads to an urgent need to develop targeted and efficient demulsifiers. In this research, a novel polydopamine-polyquaternium modified Fe3O4(PQA-PDA@Fe3O4) nanoparticle integrates the electrical neutralization, interfacial adsorption and magnetic aggregation functionalities was prepared to dispose this emulsion. Primarily, structural and surface properties of the PQA-PDA@Fe3O4demulsifier were systemically characterized by a series of analytical techniques, which presents its core-shell, hydrophilic and positively charged characters. When employing PQA-PDA@Fe3O4to treat the produced water that contained 500 mg/L emulsified oil, a demulsification efficiency of 90.5 % was achieved at 200 mg/L dosage. It was found that the PQA-PDA@Fe3O4nanoparticles could coalesce the fine oil droplets into large and dense aggregates, as demonstrated by the raised fractal dimension values. By monitoring the interfacial properties (interfacial tension, zeta potential and interfacial film elastic modulus) variations, the demulsification mechanism was further explored. The PQA-PDA@Fe3O4nanoparticle could spontaneously migrate to the oil/water interface and reassemble a loose interfacial film, thus leading the oil droplets destabilization and aggregation. Notably, the magnetic force between the PQA-PDA@Fe3O4nanoparticles significantly accelerates the oil droplets aggregation and inhibits the secondary emulsification process, so as to achieve the outstanding demulsification efficiency. Moreover, this PQA-PDA@Fe3O4nanoparticle exhibited acceptable magnetic recyclability. These results provided an effective and alternative protocol to demulsify the asphaltene-rich ASP flooding emulsions.