This paper regards the activity coefficient of salt in mixed solvents with const ant composition as a function of vapor-liquid equilibrium data by means of terna ry Gibbs-Duhem equation. A verification method includin...This paper regards the activity coefficient of salt in mixed solvents with const ant composition as a function of vapor-liquid equilibrium data by means of terna ry Gibbs-Duhem equation. A verification method including two independent criteri a for vapor-liquid equilibrium data of salt-containing system is proposed on the bases of thermodynamics and the Debye-Hückel electrolytical solution theory.A ccording to the criteria every experimental point can be verified by the calcula tion of its vapor-liquid equilibrium data.Not only is this method rigorous in th e theory,but also very convenient in the application.Under the condition of fix ing the ratio between two solvents it can be used for vapor-liquid equilibrium d ata verification of various salt-containing systems,whether the systems are isot hemic or isobaric,aqueous or non-aqueous,up to saturated or non-saturated.展开更多
The vapor-liquid equilibrium(VLE)data of α-pinene+β-pinene(428.82—438.13 K),α-pinene+p-cymene(429.05—447.15 K),β-pinene+p-cymene(439.20—448.66 K)and α-pinene+β-pinene+p-cymene(432.17—448.11 K)were determined...The vapor-liquid equilibrium(VLE)data of α-pinene+β-pinene(428.82—438.13 K),α-pinene+p-cymene(429.05—447.15 K),β-pinene+p-cymene(439.20—448.66 K)and α-pinene+β-pinene+p-cymene(432.17—448.11 K)were determined at atmospheric pressure(100.7 kPa)with the modified Ellis still.The thermodynamic consistency of the experimental data was confirmed by means of the Herington method.Three activity coefficient models,Wilson,NRTL,UNIQUAC,were used to correlate and calculate the VLE data of these binary systems to obtain the binary parameters.Average relative deviations between calculated values and experimental data of vapor phase mole fraction were all less than 0.40%.The binary parameters of Wilson equation were also used to calculate the bubble point and the vapor phase composition for the ternary mixture without any additional adjustment.The predicted VLE for the ternary system was in good agreement with the experimental results.展开更多
基金河南省科委自然科学基金 (No 9940 3 190 0 )河南省教委自然科学基金 (No 2 0 0 0 15 0 2 8)资助项目
文摘This paper regards the activity coefficient of salt in mixed solvents with const ant composition as a function of vapor-liquid equilibrium data by means of terna ry Gibbs-Duhem equation. A verification method including two independent criteri a for vapor-liquid equilibrium data of salt-containing system is proposed on the bases of thermodynamics and the Debye-Hückel electrolytical solution theory.A ccording to the criteria every experimental point can be verified by the calcula tion of its vapor-liquid equilibrium data.Not only is this method rigorous in th e theory,but also very convenient in the application.Under the condition of fix ing the ratio between two solvents it can be used for vapor-liquid equilibrium d ata verification of various salt-containing systems,whether the systems are isot hemic or isobaric,aqueous or non-aqueous,up to saturated or non-saturated.
文摘The vapor-liquid equilibrium(VLE)data of α-pinene+β-pinene(428.82—438.13 K),α-pinene+p-cymene(429.05—447.15 K),β-pinene+p-cymene(439.20—448.66 K)and α-pinene+β-pinene+p-cymene(432.17—448.11 K)were determined at atmospheric pressure(100.7 kPa)with the modified Ellis still.The thermodynamic consistency of the experimental data was confirmed by means of the Herington method.Three activity coefficient models,Wilson,NRTL,UNIQUAC,were used to correlate and calculate the VLE data of these binary systems to obtain the binary parameters.Average relative deviations between calculated values and experimental data of vapor phase mole fraction were all less than 0.40%.The binary parameters of Wilson equation were also used to calculate the bubble point and the vapor phase composition for the ternary mixture without any additional adjustment.The predicted VLE for the ternary system was in good agreement with the experimental results.
