Comparison of hydrodenitrogenation of basic and nonbasic nitrogen compounds present in oil sands derived heavy gas oil

The hydrodenitrogenation of oil sands-derived heavy gas oil has been conduc ted in a trickle bed reactor over a commercial Ni-Mo/Al2O3 catalyst in the temperature range of 365-415 degreesC, pressure in the range of 65-88 bar, liquid hourly space velocity in the range of 0.5-2 h(-1). The hydrogen/heav y gas oil ratio has been changed from 400 to 1000 mL/mL. The study was cond ucted to determine the effects of these variables on the relative rates of conversion of total, basic, and nonbasic nitrogen compounds. It was observe d that rate of conversion of nonbasic nitrogen compounds was lower than tha t of basic nitrogen compounds under identical process conditions. The press ure and hydrogen/heavy gas oil ratio have a more significant effect on the conversion of nonbasic nitrogen compound as compared to their effect on the conversion of basic nitrogen compounds. The effect of excess hydrogen sulf ide on the conversion of basic and nonbasic nitrogen compounds has also bee n studied by adding butanethiol in-the feed gas oil. An increase in the qua ntity of butanethiol decreases the conversion of both basic and nonbasic ni trogen compounds. It was also observed that in the region of higher space t ime (about 1.5-2 h), the,conversion of nonbasic nitrogen compound increased :at a sharp rate as compared to that of basic nitrogen compounds. This may be possibly due to the generation of more basic nitrogen compounds from the nonbasic ones. The kinetics of the conversion of nitrogen compounds has al so been studied in the present work.