物理化学学报 >> 2012, Vol. 28 >> Issue (11): 2567-2573.doi: 10.3866/PKU.WHXB201208211

理论与计算化学 上一篇    下一篇

CO2在Na2Cr2O7溶液中的平衡溶解度模型

周恩年1,2,3, 余志辉1,2, 曲景奎1,2, 齐涛1,2, 韩晓英1,2,3, 张国庆4   

  1. 1 中国科学院过程工程研究所湿法冶金国家重点实验室, 北京 100190;
    2 中国科学院过程工程研究所绿色过程与工程院重点实验室, 北京 100190;
    3 中国科学院研究生院, 北京 100049;
    4 四川安县银河建化(集团)有限公司, 安县四川 622656
  • 收稿日期:2012-04-11 修回日期:2012-08-20 发布日期:2012-10-17
  • 通讯作者: 余志辉, 曲景奎 E-mail:jkqu@home.ipe.ac.cnl; zhyu@home.ipe.ac.cn
  • 基金资助:

    国家杰出青年基金(51125018); 国家自然科学基金(21006119)及国家高新技术研究发展计划项目(863) (2009AA035000; 2011AA060700)资助

Equilibrium Solubility Modeling of CO2 in Na2Cr2O7 Solutions

ZHOU En-Nian1,2,3, YU Zhi-Hui1,2, QU Jing-Kui1,2, Qi Tao1,2, Han Xiao-Ying1,2,3, ZHANG Guo-Qing4   

  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:2012-04-11 Revised:2012-08-20 Published:2012-10-17
  • Supported by:

    The project was supported by the National Outstanding Youth Scientists Foundation of China (51125018), National Natural Science Foundation of China (21006119), and High-Tech Research and Development Program of China (863) (2009AA035000, 2011AA060700).

摘要:

为研究重铬酸钠(Na2Cr2O7)对CO2溶解的影响, 本文在带有搅拌的气液相高压平衡釜内, 采用静态法测定了温度在313.2-333.2 K, 压力在0.1-1.9 MPa 范围内, 重铬酸钠浓度分别为0、0.361、0.650、0.901 mol·kg-1 时, CO2 在Na2Cr2O7溶液中的溶解度. 结果表明: (1) Na2Cr2O7对CO2 的溶解有盐析效应; (2) CO2 在Na2Cr2O7溶液中的溶解符合亨利定律, 并且CO2溶解度是温度和Na2Cr2O7浓度的函数, 且用改进的Setschenow方程和Peng-Robinson-Pitzer (PR-Pitzer)方程拟合了在此温度、压力及重铬酸钠浓度范围内的实验数据, 拟合效果较好, 并且其平均相对误差分别为4.24%和3.32%.

关键词: CO2溶解度, Na2Cr2O7溶液, 热力学模型, Setschenow方程, Peng-Robinson-Pitzer 方程, 亨利常数

Abstract:

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.

Key words: CO2 solubility, Na2Cr2O7 solution, Thermodynamic model, Setschenow equation, Peng-Robinson-Pitzer equation, Henry constant

MSC2000: 

  • O642