V. Oja et Em. Suuberg, MEASUREMENTS OF THE VAPOR-PRESSURES OF COAL TARS USING THE NONISOTHERMAL KNUDSEN EFFUSION METHOD, Energy & fuels, 12(6), 1998, pp. 1313-1321
The vapor pressures of primary coal tars have been determined using a
modified Knudsen effusion method. Vapor pressure data are correlated w
ith the molecular weight and temperature for tars from three Argonne c
oal samples (Pittsburgh No. 8, Upper Freeport, and Wyodak). These resu
lts show significant differences in the vapor pressures of similar mol
ecular-weight tars from different coals. The results likewise warn tha
t the commonly used estimation techniques for vapor pressures of the c
oal tars oversimplify the actual behavior but at the same time provide
reasonable estimates for some modeling applications.