论文部分内容阅读
采用等压法研究了308.15K下NaCl-H2O、CaCl2-H2O和NaCl-CaCl2-H2O体系离子强度分别为0.5666～5.9265molkg-1、0.3943～5.5573molkg-1和0.6524～16.6631molkg-1的等压平衡浓度和水活度,计算了渗透系数及饱和蒸汽压,获得了该体系渗透系数和饱和蒸汽压随离子强度的变化规律.应用Pitzer离子相互作用模型,用实验数据用多元线性回归拟合了308.15K下该体系的NaCl和CaCl2的纯盐参数β(0)、β(1)、Cφ分别为0.3181、1.5346、-0.0014和0.07972、0.3067、0.00075,拟合标准偏差分别为0.00072、0.0049;混合离子作用参数θNa,Ca、ψNa,Ca,Cl分别为0.06821、-0.0076,拟合标准偏差为0.0063和0.0064.用Pitzer模型计算的渗透系数与实验结果吻合.本研究为含钠钙海卤水体系热力学模型建立提供了重要的热力学基础数据.
The isobaric pressures of 0.5666 ~ 5.9265molkg-1, 0.33943 ~ 5.5573molkg-1 and 0.6524 ~ 16.6631molkg-1 were investigated by isobaric pressure at 308.15K for NaCl-H2O, CaCl2-H2O and NaCl-CaCl2- Equilibrium concentration and water activity, the permeability coefficient and saturated vapor pressure were calculated, and the variation law of permeability coefficient and saturated vapor pressure of the system with ion intensity were obtained.Using Pitzer ion interaction model, the experimental data were fitted with multiple linear regression The pure salt parameters β (0), β (1) and Cφ of NaCl and CaCl2 in this system at 308.15K were 0.3181, 1.5346, -0.0014 and 0.07972, 0.3067 and 0.00075, respectively. The fitted standard deviations were 0.00072 and 0.0049, The ion action parameters θNa, Ca, ψNa, Ca and Cl were 0.06821 and -0.0076 respectively, and the fitted standard deviations were 0.0063 and 0.0064. The permeability coefficient calculated by Pitzer model was consistent with the experimental data. Model establishment provides important basic thermodynamic data.