CATALYTIC HYDROTREATING FOR NITROGEN REMO VAL FROM COAL-TAR PITCH IN SUPERCRITICAL-FLUID

Specific features of solid catalyzed reaction in supercritical fluid w ere discussed through the comparison of denitrogenation of coal tar pi tch by using NiMo-Al2O3 catalyst in supercritical fluid (toluene/tetra lin mixture) and in liquid (1-methyl naphthalene/tetralin mixture. Bas ic nitrogen compounds reacted faster than neutral nitrogen compounds o n the solid-acid-catalyst in both cases. At 703 K and 15 MPa, and in t he range of particles sizes from 0.11 to 0.85 mm where denitrogenation proceeded under chemical reaction control, the reaction rate in super critical fluid was higher than that in the liquid.