Abstract
Viscosity, infrared, and proton magnetic resonance studies are reported on the SRC II process solvent (before fractionation), and its acid + neutral fraction, and on the interaction of these coal liquids with quinoline and triethylamine. The results obtained with the coal liquids and with several model compounds suggest that hydrogen bonding involving largely phenolic OH and nitrogen-containing bases, OH…N, gives rise to protontransfer complexes, O −… pHN, which is in part responsible for the viscosity and non-Newtonian flow of the coal liquids.
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