An improved model calculating CO2 solubility in pure water and aqueous NaCl solutions from 273 to 533 K and from 0 to 2000 bar

被引:1224
作者
Duan, ZH [2 ]
Sun, R
机构
[1] Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
[2] Univ Calif San Diego, Dept Chem, La Jolla, CA 92129 USA
[3] China Univ Geosci, Fac Earth Resources, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
CO2; solubility; thermodynamics; specific interaction modeling; aqueous CO2 solution; solubility model; equation of state;
D O I
10.1016/S0009-2541(02)00263-2
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A thermodynamic model for the solubility of carbon dioxide (CO2) in pure water and in aqueous NaCl solutions for temperatures from 273 to 533 K, for pressures from 0 to 2000 bar, and for ionic strength from 0 to 4.3 m is presented. The model is based on a specific particle interaction theory for the liquid phase and a highly accurate equation of state for the vapor phase. With this specific interaction approach, this model is able to predict CO2 solubility in other systems, such as CO2-H2O-CaCl2 and CO2-seawater, without fitting experimental data from these systems. Comparison of the model predictions with experimental data indicates that the model is within or close to experimental uncertainty, which is about 7% in CO2 solubility. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:257 / 271
页数:15
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