Hydrogen depleted solvent, liquefaction

Comparison of analyses of heptane insolubles from the liquefaction of Monterey bituminous and Wyodak subbituminous coals in the hydrogen-enriched solvent shows that carbon, hydrogen and oxygen concentrations converge with increasing reaction severity to form a product with similar elemental analyses. The same convergence is seen when the hydrogen-depleted solvent is used. 

Using reaction severity it is now possible to compare the liquefaction behavior of different solvents. Solvents containing higher hydrogen donor concentration (92-26-019) are more effective than the hydrogen-depleted solvent (92-03-035) even at short times. The results also show that up to 55% conversion is essentially solvent independent. 

MAF conversions to pyridine solubles from short contact time coal liquefaction are dependent on the coal type, solvent source, and reaction severity. As reaction severity increases conversions approach a maximum value with a hydrogen-enriched solvent but go through a maximum and decline with a hydrogen-depleted... 

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