Abstract
Hydrogen donor characteristics are one of the most important properties of a coal-derived recycle solvent used in the direct liquefaction of coal. This property can be modified by direct catalytic hydrogenation to increase the solvent hydrogen content. Results of this work using 22 solvents derived from three coals indicate that recycle solvent effectiveness goes through a maximum as the hydrogen content of the solvent increases. However, the solvent hydrogen content at which the observed maximum occurs differs for different solvents. Weight percent hydrogen in a solvent at observed maximum liquefaction effectiveness has been correlated as a linear function of a Watson-type characterization factor, K/sub w/. 13 refs.
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