Evaluation of Thermophysical Properties Correlations for Coal Liquids with Equations of State

摘要

Coal liquids are characterized by cumulative weight distillation curves, molecular weights, and specific gravity. Three thermophysical property correlations were used in conjunction with Redlich-Kwong-Soave, Peng-Robinson, and modified conformal solution theory Benedict equation of state, and the Chao-Seader method to predict material balances for flash units which were compared with pilot plant data. The correlations were utilized to predict characterization parameters such as critical pressures, critical temperatures, critical volumes, and acentric factors. These parameters were then utilized in the process simulator for predicting the material balance. The effect of cut size on the overall material balance was also investigated. In order to establish a more direct method of doing thermodynamic calculations, some preliminary work has been done to correlate equation-of-state parameters to the cumulative boiling curve. Finally, a methodology has been developed for calculating sonic velocity based on the Redlich-Kwong-Soave equation of state. Comparison with experimental results are shown. 16 references, 6 figures, 3 tables. (ERA citation 09:021757)