Treating oily solids using a CO_(2)-responsive surfactant-free microemulsion:An enhanced approach for oil removal from solid surfaces  

作　　者：Xiaojiang Li Xu Liu Jie Qi Yang Yang Jinyu Wang Shanshan Dai Hongsheng Lu 

机构地区：[1]College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China [2]Engineering Research Center of Oilfield Chemistry,Ministry of Education,Chengdu 610500,China [3]Oil and Gas Field Applied Chemistry Key Laboratory of Sichuan Province,Chengdu 610500,China

出　　处：《ChemPhysMater》2023年第3期217-224,共8页化学物理材料（英文）

基　　金：supported by the Sichuan Province Fund for Distin-guished Young Scholars in China.(No.2019JDJQ0047);Applied Basic Research Project of Sichuan Provincial Department of Science and Tech-nology(No.2020YJ0343);Chengdu Science and Technology Project of the Chengdu Bureau of Science and Technology(2021-YF05-00194-SN).

摘　　要：Because switchable water is difficult to apply directly for oil removal,an enhanced approach to improve oil removal is proposed using a surfactant-free microemulsion(SFME)containing switchable water.The SFME is formed using switchable water(aqueous N,N-dimethylethanolamine(DMEA)or N,N-dimethylbutylamine(BDEA))and a hydrophobic amine(N-butyldiethanolamine(DMBA)).The single-phase region for preparing the SFME is determined using a ternary phase diagram,and the microstructure types are distinguished using the con-ductivity method.The pH changes and dynamic laser scattering test results demonstrate that the SFME exhibits irreversible transformation behavior regulated by CO_(2).Moreover,the recovered SFME containing BDEA has a microstructure with a smaller particle size after removing the CO_(2) by bubbling N 2 at 65°C,which is attributed to the higher proportion of DMEA than that of BDEA.In addition,dodecane and diesel oil are shown to dissolve in the SFME,and the oil solubility of the SFME increases with increasing oil phase(DMBA)content.The interface free energy theory reveals that the oil is more easily detached with the addition of SFME than with switchable water only owing to the reduced interface free energy of oil on the solid surface.Thus,an enhanced approach for removing oil is proposed to wash oil sands,where the oil removal efficiency of switchable water can be improved by using SFMEs containing switchable water.

关 键 词：Oil removal CO_(2)-responsive Switchable water MICROEMULSION 

分 类 号：O64[理学—物理化学]