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A Bronsted superacid, trifluoromethanesulfonic acid (TFMS), was found to desulfurize a lignite in the presence of a hydrocarbon without gaseous hydrogen at 150-200°C under autogenous pressure of 2.6-6.6 MPa. Removal of sulfur from the coal depended on the solvent, TFMS concentration and reaction temperature. TFMS alone without solvent removed only 5.3% of sulfur as H 2 S, increasing the...
Trifluoromethanesulfonic acid (TFMS) was found to convert coal almost completely to pyridine-solubles in the presence of isopentane at 150°C in 3 h under autogenous pressure of 6.0-6.8 MPa. The chemical structure of the benzene-soluble and THF-insoluble-pyridine-soluble fractions varied with the acid concentration. Lower acid concentrations provided high aromaticity and rich H ar and...
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