Effect of organic nitrogen compounds on deep hydrodesulfurization of middle distillate

The study was conducted to eliminate nitrogen compounds from diesel fraction before hydrotreating (HDT) by using extractive and adsorptive techniques. The experiments were conducted in two steps; at first, prepare nitrogen free Kuwaiti straight run gas oil (SRGO) while in the second step is to test HDT catalytic activities using synthetic diesel feed to achieve ultra-low sulfur diesel (ULSD). The HDS conversion of diesel indicated that adsorbed N species caused a decrease in hydrogenolysis activities and inhibited a part of the catalytic sites.169