Date of Award


Document Type


Degree Name

Master of Science (MS)


Chemical Engineering


The hydrogenation-solution reaction of North Dakota lignite was studied with various organic solvents in a batch microautoclave at reaction conditions of 740 degrees F. and 1500 psig. initial hydrogen pressure. The solvents included aliphatic, aromatic, cycloparaffinic, heterocyclic, phenolic and amino compounds. The extent of dissolution was measured from the amount of residue retained on an asbestos filter-mat after it was washed and dried. It was found that the hydroaromatic compounds were very effective, giving more than 70 percent solubilization of lignite in solution reaction.

Four lignites from different mines in the Northern Great Plains Provinces were dissolved in tetralin at the same operating conditions to study the effect of composition of lignite on the solution reaction. Lignites studied ranged from 71 percent to 82 percent solubilization. There was no evident correlation between the extent of solubilization and the proximate analysis. Also, the percent solubilization and the heating value of lignite did not show any correlation in the samples studied.