Methanation in a Parallel Passage Reactor

Analysis of annular bed reactor for methanation of carbon monoxide

“…Compared to the TWR the PPR possesses a relatively thick layer of catalyst and so poisoning would probably have less effect, although heat removal would be expected to be less efficient than in the TWR. DeBruijn et al (1978) successfully methanated low concentrations of COZ (3% or less) in a rectangular shaped laboratory scale PPR. Their reactor remained isothermal and their reactor model agreed well with most but not all of their experimental data.…”

“…The two particle beds are separated by an inert screen, and the main flow is in the axial direction through the core while reactants are transported to the catalyst bed by radial dispersion processes. This reactor configuration was termed an annular bed reactor (ABR), and by using the experimental conditions of DeBruijn et al (1978), Davis et al (1981) were able to show improvements in conversion brought about by packing the inner core.…”

“…The parabolic set of differential equations was solved by two methods, namely, an extrapolated Crank-Nicolson (smoothed; Lindberg, 1971; Lawson and Morris, 1978), and a backward finite difference technique, both achieving the same solution. These numerical methods were successfully used to predict the experimentally determined behavior of the parallel passage reactor (DeBruijn et al, 1978) and the isothermal annular bed reactor for methanation of carbon dioxide . The parameter space which could be studied using the parabolic system of equations was confined to the subspace which produced positive finite concentrations at the wall.…”