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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%.
In order to study the effect of sodium dichromate (Na2Cr2O7) on the CO2 dissolution, this paper uses the static method to determine the temperature in 313.2-333.2K and the pressure in the range of 0.1-1.9MPa in the gas-liquid high-pressure balancing reactor with stirring, The results showed that: (1) Na2Cr2O7 has salting-out effect on the dissolution of CO2; (2) the solubility of CO2 in the solution of Na2Cr2O7 The dissolution in Na2Cr2O7 solution complies with Henry’s law and CO2 solubility is a function of temperature and Na2Cr2O7 concentration, and the temperature at which the temperature, pressure and dichromic acid are combined with the improved Setschenow equation and the Peng-Robinson-Pitzer equation The experimental data in the range of sodium concentration showed good fitting results and the average relative errors were 4.24% and 3.32% respectively.