Article Sidebar
Article Details
Issue
Section
Articles
© 2018. This work is licensed under the creative commons Attribution 4.0 International license.
Main Article Content
Formation and behaviour of coal free radicals in relation to liquefaction conversion
Abstract
The increase in radical concentration as measured by electron spin resonance (e.s.r) spectroscopy of four selected coals (Gardenne, Freyming, Mericourt and Escarpelles) was studied. The primary object of the study was to find, if any, the correlations between radical concentration and
percentage conversion of these coals. Significant changes in radical concentration and in the chemical nature of the coals are observed as pyrolysis temperature is increased. The implications of free radicals
in coal liquefaction are examined. A gradual reduction in the number of free radicals over the temperature range (370 – 4200C) was observed in the liquid residue, Four hydroaromatic solvents (dihydrophenanthrene 1,2,3,4 –
tetrahydroqunoline, tetralin and indan) were used to stabilize the radicals. The order of free radical stabilization in these solvents is Dihydrophenanthrene > Tetrahydroquinoline > Indan > Tetralin.
percentage conversion of these coals. Significant changes in radical concentration and in the chemical nature of the coals are observed as pyrolysis temperature is increased. The implications of free radicals
in coal liquefaction are examined. A gradual reduction in the number of free radicals over the temperature range (370 – 4200C) was observed in the liquid residue, Four hydroaromatic solvents (dihydrophenanthrene 1,2,3,4 –
tetrahydroqunoline, tetralin and indan) were used to stabilize the radicals. The order of free radical stabilization in these solvents is Dihydrophenanthrene > Tetrahydroquinoline > Indan > Tetralin.
