Chemical Reaction Engineering Reviews—Houston

摘要

It is the goal of this paper to attempt a systematic organization of material in order that mechanistic as veil as pheno-menological models useful for design and scale-up of coal conversion reactors can he developed. The approach taken here is to examine the current status of coal conversion reactions on a single particle and to select a realistic yet sufficiently simple model capahle of describing the phenomena. The deficiencies and limitations of each model are presented carefully.nIn the selection of a proper rate expression of a single particle reaction, we often prefer a simpler form that represents the experimental data over a more complicated form, even at the expense of somewhat reduced accuracy. Since all rate expressions are empirical or semi-theoretical at best, it seems unnecessary to add complications by applying analysis that originated with the Langmuir adsorption isotherm or other type of isotherms (Freundlich, Templins, etc.). Such complication becomes more apparent when the rate expression must be incorporated with varying heat and diffusion effects of the system.