Solvent effects on the denitrification of solvent refined coal.

摘要

The effect of hydrogenated coal derived liquid solvent and solvent boiling range on the nitrogen content of the solvent refined coal (SRC) has been investigated. Limited studies of the effect of catalytic hydrogenation of a coal derived, nitrogen containing 350-8000°F boiling range coal liquid over CoMo on Al2O3 catalyst on the denitrification rates and nitrogen types have also been made.;Catalytic hydrogenation has an effect on the denitrification of the solvent, however, severe conditions are needed for a noticeable reduction in nitrogen. The cracking of aryl amines is the limiting step in the denitrification of the Wyodak coal derived solvent.;The heavy boiling fractions of the coal derived solvents used are the best solvents for reducing the nitrogen concentration of the SRC. Results indicate that nitrogen removed from the SRC is found in lower boiling range liquids and gases. While nitrogen probably cannot be catalytically removed from SRO, the possibility exists that it can be catalytically removed from the lower boiling range liquids. Solvent hydrogenation does not have a noticeable effect on reducing the nitrogen content of the SRC. The solvents studied indicate a synergistic effect of solvent on the nitrogen types present in soluble SRC.