Zhou Jingjing, Zhang Xincheng, He Lin, Sui Hong, Li Xingang
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; National Engineering Research Centre of Distillation Technology, Tianjin 300072, China.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; National Engineering Research Centre of Distillation Technology, Tianjin 300072, China; Zhejiang Institute of Tianjin University, Ningbo, Zhejiang 315201, China.
J Hazard Mater. 2022 Oct 5;439:129654. doi: 10.1016/j.jhazmat.2022.129654. Epub 2022 Jul 21.
Oil-water emulsions separation is frequently required considering the production and environmental issues. Herein, a nano-modification strategy has been proposed for carboxylated poly(propylene oxide)-poly(ethylene oxide) block polyether (mANP) using epoxy-functionalized magnetic nanoparticles (FeO@SiO-GPTMS), achieving the construction of a highly efficient demulsifier (M-mANP). Bottle tests showed that M-mANP could separate over 98.5% of water from the asphaltene-stabilized water-in-oil (W/O) emulsion at mANP concentration of 150 ppm within 2 min at room temperature. The demulsification efficiency for crude oil-in-water emulsion was nearly 100%. According to interfacial tension and wettability tests, the nano-modification endows M-mANP with good amphiphilicity and high interfacial activity, which enables M-mANP to rapidly adsorb at the oil-water interface. Molecular dynamics simulation shows that abundant oxygen-containing groups (hydroxyl, ether bond, ester and carboxyl groups, Fe-O and Si-O bond) in M-mANP could strengthen the interaction with water, facilitating the replacement of asphaltene molecules at interfacial film. Observation of demulsification process by microscope reveals that the nano-size promotes M-mANP to bridge small dispersed droplets, enhancing the flocculation and coalescence of droplets. The nano-modified carboxylated polyether with outstanding demulsification ability shows a promising application for the treatment of different oil-water emulsions.
考虑到生产和环境问题，油水乳液分离经常是必要的。在此，已提出一种使用环氧官能化磁性纳米颗粒（FeO@SiO-GPTMS）对羧化聚（环氧丙烷）-聚（环氧乙烷）嵌段聚醚（mANP）进行纳米改性的策略，从而构建了一种高效破乳剂（M-mANP）。瓶试表明，在室温下，当mANP浓度为150 ppm时，M-mANP能在2分钟内从沥青质稳定的油包水（W/O）乳液中分离出超过98.5%的水。对水包油乳液的破乳效率接近100%。根据界面张力和润湿性测试，纳米改性赋予M-mANP良好的两亲性和高界面活性，这使得M-mANP能够迅速吸附在油水界面。分子动力学模拟表明，M-mANP中丰富的含氧基团（羟基、醚键、酯基和羧基、Fe-O和Si-O键）可以加强与水的相互作用，促进界面膜上沥青质分子的置换。通过显微镜观察破乳过程发现，纳米尺寸促进M-mANP桥接小的分散液滴，增强液滴的絮凝和聚并。这种具有出色破乳能力的纳米改性羧化聚醚在处理不同的油水乳液方面显示出有前景的应用。
