Citation: ZHOU En-Nian, YU Zhi-Hui, QU Jing-Kui, Qi Tao, Han Xiao-Ying, ZHANG Guo-Qing. Equilibrium Solubility Modeling of CO₂ in Na₂Cr₂O₇ Solutions[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201208211 shu

Equilibrium Solubility Modeling of CO₂ in Na₂Cr₂O₇ Solutions

ZHOU En-Nian ^1,2,3 ,
YU Zhi-Hui ^1,2, ,
QU Jing-Kui ^1,2, ,
Qi Tao ^1,2 ,
Han Xiao-Ying ^1,2,3 ,
ZHANG Guo-Qing ⁴

1.
1 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China;
2 Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China;
3 Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
4 Sichuan AnxianYinHe Construction & Chemical Group Co. Ltd., Anxian622656, SichuanProvince, P. R. China

Received Date: 11 April 2012
Available Online: 21 August 2012
Fund Project: 国家杰出青年基金(51125018) (51125018) 国家自然科学基金(21006119) (21006119)国家高新技术研究发展计划项目(863) (2009AA035000 (863)

The solubility of CO₂ in aqueous Na₂Cr₂O₇ solutions of different concentrations (0, 0.361, 0.650, and 0.901 mol·kg^-1) was measured in a stirred vapor-liquid high-pressure equilibrium cell using the static method at temperatures and pressures in the ranges of 313.2 to 333.2 K and 0.1 to 1.9 MPa, respectively. The results indicated that the phenomenon of CO₂ dissolved in aqueous Na₂Cr₂O₇ could be interpreted according to a “salting-out effect”. Furthermore, our solubility data for CO₂ in aqueous Na₂Cr₂O₇ was in agreement with Henry's law, and the Henry constant appeared to be a function of temperature, pressure, and the concentration of Na₂Cr₂O₇. Two thermodynamic models were applied to correlate the experimental data, including the modified Setschenow and Peng-Robinson-Pitzer equations, and the averaged relative deviations were found to be 4.24% and 3.32%, respectively.
- CO₂ solubility,
- Na₂Cr₂O₇ solution,
- Thermodynamic model,
- Setschenow equation,
- Peng-Robinson-Pitzer equation,
- Henry constant
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Equilibrium Solubility Modeling of CO₂ in Na₂Cr₂O₇ Solutions