High pressure enthalpy of vaporization and vapor pressure for coal based chemicals
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It is redundant to emphasize the need for high pressure thermodynamic studies especially when coal is regarded as an alternate source for energy. Apart from the aspects of economics in the design of industrial process to convert coal to more convenient liquid and gas fuel forms such studies are useful to unfold the nature of the molecular interactions. The present study deals with the simultaneous measurement of the enthalpy of vaporization and vapor pressure using a single apparatus for pure components. A theoretical model is derived for the prediction of enthalpy of vaporization (Hy)p and tested with the experimental data. As there are practically no high pressure calorimetric data available in literature, this study provides such data for benzene, toluene, p-xylene (BTX) and tetralin. Also the study suggests a new model for the prediction of (AHy)p for other organic compounds. Methods for purification, analysis, instrumentation, and calibration procedures for the instruments used in the measurements and the results are reported in this dissertation. The vapor pressure and (AHy)p measurements cover the temperature range of 351.79 to 477.75 [degree]K for benzene, 379.63 to 521.13 [degree]K for toluene, 411.49 to 557.25 [degree]K for p-xylene and 498.33 to 604.52 [degree]K for tetralin. The pressure range covered is approximately 1 to 16 bars. The accuracy of (AHy)p measurement is within 2 to 3 J/mole. The uncertainty in the presented experimental (AHy)p values is + 30 J/mole. A new compressibility equation is developed in the process of formulating a theoretical model for (AHy)p . It is shown by calculating the compressibility and (AHy)p that the new model is superior to the existing models due to Muller-Prausnitz (4), Yosim-Owens (146), Wilhelm et al. (112) and Reiss et al. (110).
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