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Diffusion Studies of Light Hydrocarbon Gases Through Coal.
Karn-FS; Friedel-RA; Sharkey-AG Jr.
NTIS: PB 196 595 :11 pages
Measurements were made of the flow of helium, methane, ethane, butane, and toluene through thin disks of coal. All measurements were made on a dense layer in the Pittsburgh seam identified as attritus. Flow increased with pressure differential and temperature. At room temperature and a pressure differential of 1 atmosphere flow rates along the bedding plane of Pittsburgh seam coal were helium 881 x 10-10 cm2sec-1, methane 1.2 X 10-10 cm2sec-1, ethane 0.54 X 10-10 cm2sec-1, n-butane 0.35 X 10-10 cm2sec-1, and toluene 3.8 X 10-10 cm2sec-1. Flow rates were 50 percent lower across the bedding plane of the coal than along the bedding plane. Activation energies were 3.9 Kcal mole-1 for helium and 13.6 Kcal mole-1 for methane, with diffusion measured either along or across the bedding plane.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 196 595
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division