Density and viscosity data of pure 3-chloro-4-fluoronitrobenzene and 3-chloro-2-fluoronitrobenzene were obtained in temperature range from 318.15 K to 348.15 K at the local atmospheric pressure of 99.7 kPa. The value of corresponding saturated vapour pressure of two isomers were determined in the temperature range of 409 K to 517 K. The relationship between temperature and density can be well correlated by the linear equation. The viscosity data was well described by the Litovitz, Ghatee, VFT, and Andrade equations, and the calculated value by the VFT equation is consistent with the measured data. Both the Antoine and Riedel equations can accurately describe the relationship between saturated vapour pressure and temperature of 3-chloro-4-fluoronitrobenzene and 3-chloro-2-fluoronitrobenzene, which can meet the requirements for chemical design. In addition, the thermal expansion coefficient was determined based on the density data, and the molar vaporisation enthalpy of two isomers was evaluated using the Clausius-Clapeyron equation.
Jinbei Yang,Shucui Han,Hongcun Chen,Meiqiong Yu,Zhongliang Yao
Density and viscosity data of pure liquid 4‑fluoronitrobenzene and 2‑fluoronitrobenzene were determined in the temperature range from 303.15 to 353.15 K at the local atmospheric pressure of 100.8 kPa. Saturated vapor pressures of the two isomers and isobaric vapor–liquid equilibrium (VLE) data for the binary system of the two isomers at 10.0 kPa were measured experimentally by a modified Rose still. The relationship of density to temperature is accurately correlated by the DIPPR equation. The viscosity data were well described by the Litovitz, Ghatee, VFT, and Andrade equations. Among them, Andrade equation shows the best accuracy. Both Antoine and Riedel equations can successfully correlate the relationship between saturated vapor pressure and temperature, while Riedel equation is more accurate due to the small average relative deviation. The binary VLE data were correlated with NRTL and Wilson models, and the binary interaction parameters were obtained. The VLE data predicted by the obtained parameters are in good agreement with the experimental data, and the binary system did not exhibit azeotropic behavior. The thermodynamic properties of the pure components described above and the vapor–liquid equilibrium data provided are critical for the design and operation of the distillation of the isomeric mixture of 4‑fluoronitrobenzene + 2-fluoronitrobenzene.
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