On the association model for treating hydrogen bonding interaction of a solvent-swollen coal

The association model for the quantitative description of hydrogen bonding interactions in a solvent-swollen coal is examined. A brown coal was swolle n in binary solvents, including different pyridine/benzene and dimethyl sul foxide/benzene mixtures. The amount of hydroxylic hydrogen remaining immobi le (f(IM(OH))) was experimentally determined by using pulsed H-1 NMR techni que as a function of the swelling ratio (Q). These observations were theore tically assessed by using the association model. It was found that the mode l predicts reasonably the effects of the polar solvent on the relationship between f(IM(OH)) and 1/Q.