Zhu Teng, Li Yuming, Gong Houjian, Dong Mingzhe
State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, Beijing 102249, PR China.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, PR China.
ACS Omega. 2021 Mar 5;6(10):6663-6673. doi: 10.1021/acsomega.0c05462. eCollection 2021 Mar 16.
Using a high-pressure phase equilibrium apparatus and vibrating-tube densimeter, phase transition pressures of CO (1) + acetic acid (2) binary systems with = 0.000, 0.107, 0.163, 0.222, and 1.000 were measured under temperatures from 308.15 to 338.15 K. Besides, the densities at the same composition and temperature under pressure from 15 to 45 MPa were also detected, and the volumes of mixing (Δ ) were calculated. Three prediction models (SRK EOS, PC-SAFT EOS, and TS model) were introduced to predict and correlate the density of binary systems, which was found to have positive relationships with temperature and acetic acid concentration and a negative relationship with pressure. Thereinto, the variation trend of CO density with pressure tends to be flat under high pressure, and which of acetic acid density increased linearly with pressure. Δ are negative, and their absolute value increases with the increase of temperature and the decrease of pressure. The work herein could provide a theoretical guide and basic data for supercritical CO extraction technology and CO application in oil field development.
使用高压相平衡装置和振动管密度计，在308.15至338.15 K的温度下测量了 = 0.000、0.107、0.163、0.222和1.000时CO(1)+乙酸(2)二元体系的相变压力。此外，还检测了在15至45 MPa压力下相同组成和温度下的密度，并计算了混合体积(Δ )。引入了三种预测模型(SRK状态方程、PC-SAFT状态方程和TS模型)来预测和关联二元体系的密度，发现其与温度和乙酸浓度呈正相关，与压力呈负相关。其中，CO密度随压力的变化趋势在高压下趋于平缓，而乙酸密度随压力呈线性增加。Δ 为负，其绝对值随温度升高和压力降低而增大。本文的工作可为超临界CO萃取技术及CO在油田开发中的应用提供理论指导和基础数据。
