Process for selective hydrogenation of highly unsaturated compou

Details Process for selective hydrogenation of highly unsaturated compou Process for selective hydrogenation of highly unsaturated compou

1995-07-10

1997-01-21

Warden, Robert J.

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 32, 203 33, 203 50, 203 71, 203DIG6, 208 49, 208 92, 208145, 208217, 585253, 585260, 585262, 585264, 585324, 585809, B01D 334, C01G 700, C07C 522

Patent

active

055956343

ABSTRACT:
A process for treating C.sub.3 to C.sub.12 petroleum fractions, such as a light cracked naphtha to be used as an etherification feed stock in which H.sub.2 S is removed by distillation of at least the C.sub.3 fraction and mercaptans and diolefins are removed simultaneously in a distillation column reactor using a dual catalyst bed. The mercaptans and H.sub.2 S are reacted with the diolefins in the presence of a reduced nickel catalyst to form sulfides which are higher boiling than the portion of the feed which is fractionated to an upper hydrogenation catalyst bed of palladium for hydrogenating diolefins and acetylenes. The higher boiling sulfides are removed as bottoms along with heavier materials. Any diolefins not converted to sulfides and acetylenes are selectively hydrogenated to mono-olefins in the presence of a palladium oxide catalyst in an upper bed, producing overheads, substantially free of sulfur compounds, diolefins and acetylenes.

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