PROCESS FOR THE DESULFURIZATION OF A LIGHT FCC NAPHTHA

摘要

A process for the desulfurization of a light boiling range (C5-350 °F) fluid catalytically cracked naphtha, which may be first subjected to a thioetherification to react the diolefins with mercaptans contained in it to form sulfides, is fed to a high pressure (250 psig) catalytic distillation hydrodesulfurization step along with hydrogen under conditions to react most of the organic sulfur compounds, including sulfides from the thioetherification to from H2S. The H2S and a light product stream (C5's and C6's) are removed as overheads. The bottoms from the catalytic distillation hydrodesulfurization step is fractionated and the bottoms from the fractionation contacted with hydrogen in a straight pass hydrogenation step in the presence of a hydrodesulfurization catalyst at pressure of 250 and temperature 400 °F to further reduce the sulfur content.