Patent ID: 6090270
Filing Date: 2000-07-18
Classification: C10G

Abstract:
An integrated process for the treatment of pyrolysis gasoline containing organic sulfur compounds including mercaptans, acetylenes, diolefins, olefins, benzene, toluene and xylenes, comprising the steps of:(a) feeding the pyrolysis gasoline and hydrogen to a hydrotreater/depentanizer wherein the acetylenes and diolefins contained within the C.sub.5 and lighter fraction are selectively hydrogenated concurrently with the separation of the C.sub.5 and lighter fraction as a first overheads from the C.sub.6 and heavier fraction as a first bottoms;(b) feeding the first bottoms from step (a) and hydrogen to a first hydrotreater distillation column reactor wherein mercaptans contained within the C.sub.6 -C.sub.8 fraction are selectively reacted with diolefins contained within the C.sub.6 -C.sub.8 fraction to form sulfides and the remaining diolefins contained within the C.sub.6 -C.sub.8 fraction are selectively hydrogenated to mono olefins concurrently with the separation of the C.sub.6 -C.sub.8 and lighter fraction as a second overheads from the Cg and heavier fraction as a second bottoms; and(c) feeding the second bottoms from step (b) containing the C.sub.9 and heavier material to a second hydrotreater distillation column reactor wherein mercaptans in the second bottoms are reacted with diolefins in the second bottoms to form sulfides while concurrently in said second hydrotreating distillation column reactor, separating the material boiling at less than 400.degree. F. as a third overheads from the material boiling at greater than 400.degree. F. as a third bottoms.