Get access

Intraparticle mass transfer in coal pyrolysis

Authors

  • George R. Gavalas,

    1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125
    Search for more papers by this author
  • Karl A. Wilks

    1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125
    Current affiliation:
    1. Stauffer Chemical, Richmond, Calif
    Search for more papers by this author

Abstract

Intraparticle mass transfer in coal pyrolysis is described by ternary diffusion and viscous flow, in conjunction with a simple pore model to predict concentration profiles for gases and tar. At low pressures, product yields depend on particle size only, while at high pressures they depend on pressure and particle size. Limited experimental data from a subbituminous coal confirm these trends. Data from a bituminous coal show different trends, as expected from the drastic changes the pore structure undergoes during pyrolysis.

Get access to the full text of this article

Ancillary