| dc.description.abstract | The purpose of this research was to investigate the competitive adsorption behavior of methane, carbon dioxide and nitrogen on the surface of coal. Measurements were focused on the adsorption of the pure gases methane, nitrogen, carbon dioxide and their mixtures. Experiments were conducted on wet Fruitland and Illinois-6 coals at 115 (deg) F. Mathematical models have been applied to describe the observed behavior. Five models: Langmuir, Loading-Ratio-Correlation (LRC), Zhou-Gasem-Robinson (ZGR) equation of state, Park-Gasem-Robinson (PGR) equation of state and Sirnplified-LocalDensity (SLD) approach were used to correlate the experimental data of pure methane, carbon dioxide and nitrogen adsorption on wet Fruitland and Illinois-6 coals at 115 (deg) F . The LRC model and the ZGR equation of state were used to correlate the adsorption measurements of binary mixtures involving methane, carbon dioxide and nitrogen on wet Fruitland coal at 115 (deg) F . Precise pure gas adsorption on wet Fruitland and Illinois-6 coals and binary mixture adsorption data on wet Fruitland coal have been obtained. The uncertainty for pure gas adsorption is less than 5% for pressures from 100 to 1800 psia, and the uncertainty for the total adsorption in binary gas mixtures is within 7%. The mathematical models can correlate the experimental data precisely. Results show that all five models can represent the pure gas experimental data less than 3% average absolute error. | |
