Measurements of CO2鈥揌2O鈥揘aCl Solution Densities over a Wide Range of Temperatures, Pressures, and NaCl Concentrations

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• 作者：Yongchen Song ; Yangchun Zhan ; Yi Zhang ; Shuyang Liu ; Weiwei Jian ; Yu Liu ; Dayong Wang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：December 12, 2013
• 年：2013
• 卷：58
• 期：12
• 页码：3342-3350
• 全文大小：304K
• 年卷期：v.58,no.12(December 12, 2013)
• ISSN：1520-5134

文摘

The density of carbon dioxide + brine solution under supercritical conditions is a significant parameter for CO₂ sequestration into deep saline formations. This paper has extended our previous study on density measurements of CO₂ + Tianjin brine to the CO₂鈥揌₂O鈥揘aCl solution by using a magnetic suspension balance (MSB). The measurements were performed in the pressure range (10 MPa to 18 MPa) at a range of temperatures (60 掳C to 140 掳C) with different concentrations of NaCl (C_NaCl = 1 mol路kg^鈥?, 2 mol路kg^鈥?, 3 mol路kg^鈥?, 4 mol路kg^鈥?) and different CO₂ mass fractions (w = 0, 0.01, 0.02, 0.03). The influences of pressure, temperature, CO₂ mass fractions and NaCl concentration on the CO₂鈥揌₂O鈥揘aCl solution density were analyzed. The CO₂鈥揌₂O鈥揘aCl solution density increased almost linearly with an increase in the CO₂ mass fraction when the NaCl concentration was less than 4 mol路kg^鈥? and the temperature was lower than 120 掳C. However, at a high concentration of NaCl (C_NaCl = 4 mol路kg^鈥?), the density decreased with increasing mass fraction of CO₂ when the temperature was over 120 掳C. The density of the CO₂鈥揌₂O鈥揘aCl solution with a high NaCl concentration decreased after dissolving CO₂ at high temperatures, which caused the solution to float over the saline layer and increased the risk of CO₂ leakage. An empirical model was established to predict the solution density with high accuracy.