It has been reported that the presence of nitrogen compounds, such as pyridine, quiaoline, acridine, indole, carbazole, and their derivatives, in liquid hydrocarbon streams strongly inhibits hydrodesulfurization (HDS), especially the ultra-deep HDS, and poisons most of the catalysts used in the subsequent processes. Consequently, removal of such nitrogen compounds prior to HDS may remarkably improve the HDS performance. Many investigations in the effect of nitrogen compounds on HDS of model compounds have been reported. However, limited studies have been reported in available literature in the effect of nitrogen compounds on HDS of real liquid hydrocarbon streams, as it is related to the separation of the coexisting nitrogen compounds from the real liquid hydrocarbon streams. In the present paper, in order to enhance the HDS performance, pre-denitrogenation of the nitrogen compounds from real gasoil and light cyclic oil was conducted by both adsorption and extraction, and its effect on subsequent HDS was examined.
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