Thermodynamic model for calorimetric and phase coexistence properties of coal derived fluids
The objective of this project is to develop a thermodynamic model for phase equilibria and calorimetric properties of coal derived fluids. Through efforts of a previous project, a model for phase equilibria of coal derived liquids is already available. In this project, this model is to be extended to include calorimetric properties as well. The modification involves the use of the modified UNIFAC correlation with suitably regressed parameters, combined with an appropriate equation of state to represent compressibility of the liquid phase. To accomplish this satisfactorily, the proposed work includes three tasks: (1) Refinement of the characterization procedure to include distribution of sulfur, oxygen and nitrogen heteroatoms in coal liquids. This is to be accomplished by size exclusion chromatography of coal liquid samples, followed by elemental and FTIR analysis of separated fractions. (2) Measurement of high temperature (up to 400C) and high pressure (up to 1000 psi) VLE data for binary systems of selected model compounds. The VLE apparatus assembled as a part of the previous project will be used for this purpose, and (3) Development of the thermodynamic model. The final product will include a computer program which with measurable properties of coal liquids as input, will give results for phase coexistence properties and excess enthalpies in the liquid phase. The high temperature, high pressure VLE apparatus has been calibrated and tested. Some preliminary data are currently being measured to assure that the apparatus gives reproducible data. Once this is completed, binary VLE data on model compound systems will be measured. In this report we give a full report of the VLE apparatus. 5 figs.
- Research Organization:
- North Carolina Agricultural and Technical State Univ., Greensboro, NC (United States). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-89PC89762
- OSTI ID:
- 5581917
- Report Number(s):
- DOE/PC/89762-T8; ON: DE91016534
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermodynamic model for calorimetric and phase coexistence properties of coal derived fluids
Thermodynamic model for calorimetric and phase coexistence properties of coal derived fluids. Final technical report