Abstract
The swelling properties of a rank range of eight coals were studied using two series of solvents, in terms of electron donor number and pK b values. It was found that swelling properties could be correlated well with pK b values, the electron donor number values were not related to coal behaviour. The swelling data are consistent with the conclusion that the mechanism of swelling of the macromolecular structure of coals in basic solvents is one of breakage of hydrogen bonds.
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