文献类型：期刊文献

英文题名：Experimental and theoretical determination of minimum miscibility pressure of supercritical CO2 and alkanes at nanoconfinement

作者：Tao, Linyang[1];Liu, Weijie[1];Shi, Jiawei[2];Guo, Yaohao[1];Qin, Wanjun[1];Bao, Bo[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China

年份：2025

卷号：302

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20244217215480);WOS:【SCI-EXPANDED(收录号:WOS:001337059500001)】；

基金：This work is supported by the National Natural Science Foundation of China (No. 22278128) .

语种：英文

外文关键词：Minimum miscibility pressure; Nanoconfinement; Nanofluidic; CO 2 enhancing oil recovery; Modified PR-EOS

摘要：The minimum miscibility pressure (MMP) is crucial for CO2 Enhanced Oil Recovery (EOR). However, accurately determining MMP within nanoconfinement has been challenging due to intricate molecular interactions and reduced permeability. This study leveraged nanofluidic technology to determine MMP for supercritical CO2-alkanes at the nanoscale by observing the vanishing interface, noting a 5.1 % reduction for CO2-octane at 30 nm versus 1 mu m at 80 degree celsius. It further explored the impact of alkane type and temperature on nanoconfinement, elucidating the underlying mechanisms. Additionally, a theoretical method was developed to estimate MMP ranging from 10 to 1000 nm, aligning well with the experimental results. The findings highlight the lower nanoscale MMP values compared to the bulk phase. This research presents methods for investigating thermodynamic properties under nanoconfinement, providing insights into the abnormal behaviors of fluids at the nanoscale and contributing to EOR.