Open AccessHigh Temperature High Pressure Thermodynamic Measurements for Coal Model Compounds
Author(s) -
John C. Chen,
Vinayak N Kabadi
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/1686
Subject(s) - uniquac , thermodynamics , ethylbenzene , chemistry , coal , vapor–liquid equilibrium , vapor pressure , process engineering , benzene , activity coefficient , chromatography , organic chemistry , physics , aqueous solution , non random two liquid model , engineering
The overall objective of this project is to develop a better thermodynamic model for predicting properties of high-boiling coal derived liquids, especially the phase equilibria of different fractions at elevated temperatures and pressures. The development of such a model requires data on vapor-liquid equilibria (VLE), enthalpy, and heat capacity which would be experimentally determined for binary systems of coal model compounds and compiled into a database. The data will be used to refine existing models such as UNIQUAC and UNIFAC. The flow VLE apparatus designed and built for a previous project was upgraded and recalibrated for data measurements for thk project. The modifications include better and more accurate sampling technique and addition of a digital recorder to monitor temperature, pressure and liquid level inside the VLE cell. VLE data measurements for system benzene-ethylbenzene have been completed. The vapor and liquid samples were analysed using the Perkin-Elmer Autosystem gas chromatography