Description:
<jats:title>Abstract</jats:title><jats:p>The chemical reactions and mass transfer processes occurring within a single coal particle during high temperature hydropyrolysis are described mathematically and the model is tested using extant experimental data. A significant feature of the model is the treatment of bulk flow due to the evolution of volatiles and the resulting balance between diffusion, bulk flow, and chemical reaction. Predictions of the variations in conversion due to changes in total pressure, hydrogen partial pressure, and particle size agree quantitatively with experimental data.</jats:p>