CO_2在Na_2Cr_2O_7溶液中的平衡溶解度模型(英文)  

Equilibrium Solubility Modeling of CO_2 in Na_2Cr_2O_7 Solutions

作　　者：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 

机构地区：[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,四川安县622656

出　　处：《物理化学学报》2012年第11期2567-2573,共7页Acta Physico-Chimica Sinica

基　　金：supported by the National Outstanding Youth Scientists Foundation of China(51125018);National Natural Science Foundation of China(21006119);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313.2-333.2K,压力在0.1-1.9MPa范围内,重铬酸钠浓度分别为0、0.361、0.650、0.901mol.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%.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.

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 

分 类 号：O645.12[理学—物理化学]