Patent ID: 7959793
Filing Date: 2011-06-14
Classification: C10G

Abstract:
1. A process for the treatment of a full boiling range fluid cracked naphtha containing mercaptans, olefins, diolefins, acetylenes and MAPD comprising the steps of: (a) feeding the full boiling range fluid cracked naphtha to a reactor containing a solid hydrogenation catalyst under conditions such as to keep the full boiling range fluid cracked naphtha in at least a partial liquid phase; (b) concurrently feeding hydrogen at such a rate as required to support selective hydrogenation of said diolefins, acetylenes, and MAPD to mono olefins; (c) reacting a portion of said diolefins with a portion of said mercaptans to form sulfides and selectively hydrogenating a portion of said acetylenes, MAPD and diolefins in the presence of said catalyst in said reactor; (d) feeding the effluent from the reactor to a distillation column where the effluent in fractionated into a light fluid cracked naphtha having reduced mercaptans, acetylenes, MAPD and diolefins which is removed as overheads and a heavy fluid cracked naphtha containing the sulfides from step (c) is removed as a bottoms; (e) withdrawing a mid cut fluid cracked naphtha from said distillation column as a side draw said mid cut fluid cracked naphtha containing mercaptans, thiophenes and sulfides from; (f) feeding said bottoms and hydrogen to the top of a second hydrodesulfurization reactor containing a hydrodesulfurization catalyst; (g) feeding hydrogen and said mid cut fluid cracked naphtha to said second hydrodesulfurization reactor at a point below the top of said hydrodesulfurization catalyst; (h) reacting mercaptans, thiophenes, and sulfides with hydrogen to form hydrogen sulfide in said second hydrodesulfurization reactor; and (g) feeding the effluent from said second reactor to a second distillation column reactor wherein hydrogen sulfide is stripped from the product as overheads and a heavy fluid cracked naphtha is removed as a second bottoms.