【作者】 刘东芳； 张颖； 朱佩瑶； 鲁红升； 黄志宇；

【Author】 Dongfang Liu;Ying Zhang;Peiyao Zhu;Hongsheng Lu;Zhiyu Huang;College of Chemistry and Chemical Engineering, Southwest Petroleum University;

【机构】 西南石油大学化学化工学院；

【摘要】 以油酸钠作为表面活性剂,异丙醇作为助表面活性剂,油酸作为油相和水混合后制备了一种具有CO₂响应性能的含有表面活性剂微乳液（SBME）。研究发现该微乳液的CO₂响应性能与异丙醇的浓度大小直接相关。当异丙醇的浓度较低（22.73 wt%）时,微乳液的CO₂响应明显。当异丙醇的浓度升高（54.05 wt%and 63.83 wt%）时,CO₂的通入并不能导致微乳液发生破乳。油酸钠在CO₂作用下可以转变为油酸,从而可以诱导微乳液发生破乳。通过对比CO₂对（拟）三元相图的影响发现,CO₂通入低IPA浓度的微乳液体系中,IPA不能够稳定多余的油酸和水,微乳液最终会发生破乳。而在高IPA浓度的微乳液体系中,IPA能够作为两亲溶剂稳定油酸和水形成无表面活性剂微乳液（SFME）。最终实现了CO₂诱导SBME转变为SFME。更多还原

【Abstract】 A microemulsion with a CO₂ response was prepared by mixing the surfactant sodium oleate（NaOA）,co-surfactant isopropyl alcohol （IPA）,oil phase oleic acid （HOA） and water.This surfactant-based microemulsion （SBME） has a CO₂ responsive behavior,and the introduction of CO₂can breakdown the microemulsion.Through the research in this paper,it is found that the content of IPA has a direct impact on the CO₂ response behavior of SBME.It was found that the lower the IPA content （22.73 wt%）,the more obvious the CO₂ response behavior of SBME.Conversely,when the concentration of IPA is high （54.05 wt%and 63.83 wt%）,the introduction of CO₂ does not directly lead to the demulsification of the microemulsion.NaOA can be converted to HOA under the action of CO₂,which is why SBME has CO₂ response behavior.By comparing the effects of CO₂ on the（pseudo-）ternary phase diagrams of SBME and surfactant-free microemulsion （SFME）,we found evidence that SBME has different CO₂ response behaviors.When CO₂ was bubbled into SBME system with low IPA content,IPA can not stabilize the excessive HOA and water in the system and eventually break the microemulsion.The situation is different when CO₂ is applied to the SBME system with high IPA content.IPA as an amphiphilic solvent can stabilize the HOA and water in the system to form SFME.In this process,SBME can be demulsified （low IPA content） or can be converted to SFME （high IPA content） in the presence of CO₂.更多还原