Enthalpy measurement of coal-derived liquids. Combined quarterly technical progress reports, April-June 1979 and July-September 1979. [Effect of association]

Technical Report · Mon Jan 01 00:00:00 EST 1979

DOI:https://doi.org/10.2172/5090283· OSTI ID:5090283

Kidnay, A J; Yesavage, V F

Enthalpy measurements on a coal-derived naphtha and middle distillate, both produced by the SRC-II process, were made using flow calorimetry. The accuracy of the measurements, as reported by Omid, was within +- 1% of the measured enthalpy differences, ..delta..H. Experimental data for the naphtha were obtained over a pressure range of 100-300 psia and temperatures from 148/sup 0/ to 456/sup 0/F. The middle distillate enthalpy measurements were made in the pressure and temperature ranges of 130 to 1000 psia, and 157/sup 0/ to 675/sup 0/F, respectively. The methods of prediction of enthalpy developed for petroleum fractions were unsatisfactory when applied to the above data. A negative bias was observed in the predicted enthalpy values for several of the coal-liquids. Based on these results, it was theorized that the high experimental enthalpy values for coal-liquids were due to an energy of association attributed, primarily, to hydrogen-bonding effects. The petroleum-fraction enthalpy correlations were then tested on the experimental data for pure compounds, both associating and non-associating. The predicted values compared very well with the experimental results for non-associating model compounds. However, for associating model compounds the predicted enthalpy values were considerably lower than their experimental data. This served to confirm the basic premise that the high experimental enthalpy values, for model compounds and coal liquids, were a direct consequence of an energy of association attributed, primarily, to hydrogen-bonding effects.

• Research Organization: Colorado School of Mines, Golden (USA)
• DOE Contract Number: AC22-79ET13395
• OSTI ID: 5090283
• Report Number(s): DOE/ET/13395-1/2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL LIQUIDS
ENTHALPY
CHEMICAL BONDS
COAL LIQUEFACTION
CORRELATIONS
EXPERIMENTAL DATA
HYDROGEN
MEASURING METHODS
PRESSURE DEPENDENCE
SRC-II PROCESS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
DATA
ELEMENTS
FLUIDS
INFORMATION
LIQUEFACTION
LIQUIDS
NONMETALS
NUMERICAL DATA
PHYSICAL PROPERTIES
THERMOCHEMICAL PROCESSES
010600* - Coal
Lignite
& Peat- Properties & Composition
010405 - Coal
Lignite
& Peat- Hydrogenation & Liquefaction