Exxonmobil Research and Engineering Company

Exxon Research and Engineering Company

Exxonmobil Chemical Patents Inc.

Garland B Brignac

Thomas R Halbert

John P Greeley

Michele Sue Touvelle

Bruce R Cook

Richard A Demmin

William C Baird, Jr

Craig A McKnight

Edward Stanley Ellis

Randolph John Smiley

Janet Renee Clark

Craig McKnight

Robert Charles Welch

Joseph J Kociscin

John C Coker

Brij N Gupta

Gary Brice McVicker

Teh Chung Ho

Mark Alan Greaney

Gordon Frederick Stuntz

Michael C Clark

William E Winter, Jr

William Ernest Lewis

Paul K Ladwig

Benjamin S Umansky

Michael Charles Kerby

Zhiguo Hou

Tahmid I Mizan

Madhav Acharya

Peter W Jacobs

John G Matragrano

William E Winter

Jeffrey L Kaufman

Andrew C Moreland

Donald J Norris

Theresa A Lalain

Chu Siang Loo

Theresa A Lelain

Glenn J Moloney

Katherine Sullivan Phillion

Described is an apparatus for, and a method of, recovering linear butenes from a mixed feed comprising providing a first mixed feed comprising linear butenes and isobutene; contacting the first mixed feed with an oligomerization catalyst such as an MWW family zeolite in a first oligomerization reactor to produce a second mixed feed comprising the linear butenes, Colefins and higher oligomers, and a reduced amount of isobutene relative to the first mixed feed; and separating the second mixed feed to produce a first effluent of first purified linear butenes, and a second effluent of Colefins and higher oligomers. The oligomerization reactor may be a converted isobutene-to-methyl-t-butylether reactor.

Method of isolating linear butenes from a mixed hydrocarbon feed

This invention relates to a process for activating a hydroprocessing catalyst and the use of activated catalyst for hydroprocessing. More particularly, hydroprocessing catalysts are activated in the presence of carbon monoxide. The catalysts that have been activated by CO treatment have improved activity.

Activating hydroprocessing catalysts using carbon monoxide and use of catalysts for hydroprocessing

The distillate catalytic hydrodesulfurization of hydrocarbon fuels wherein the optimum hydrogen treat gas rate to maximize desulfurization is determined and introduced into the reaction zone to maintain a controlled amount of hydrogen at the surface of the catalyst during hydrodesulfurization.

Deep hydrodesulfurization of hydrocarbon feedstreams

A low hydrogen partial pressure process for desulfurizing naphtha in the presence of a hydrodesulfurization catalyst which catalyst is selective for suppressing hydrogenation of olefins and in the presence. This invention also relates to the use of optimum metals loading for achieving a high level of hydrodesulfurization with a low level of olefin saturation.

Low pressure selective desulfurization of naphthas

The hydrogenation activity of a heteroatom removal catalyst, having activity for both heteroatom removal and hydrogenation, is selectively suppressed by a treatment which comprises contacting the catalyst with (i) hydrogen, (ii) a selectively deactivating agent that suppresses the catalyst's hydrogenation activity, and (iii) a protective agent, such as CO, that preserves and protects the heteroatom removal activity during the treatment. This may be achieved in a reactor while it is on-line and removing heteroatoms from a hydrocarbon feed.

Selectively suppressed hydrogenation catalyst

Naphtha is selectively hydrodesulfurized in the presence of a sulfided, treated catalyst comprising at least a Group VIB metal catalytic component, to produce sulfur-reduced naphtha with reduced olefin loss due to saturation. The catalyst is treated with hydrogen, a selectively deactivating agent which deactivates its hydrogenation activity, and a protective agent which preserves its hydrodesulfurization activity during the treatment.

Naphtha desulfurization with selectively suppressed hydrogenation

Naphtha hydrodesulfurization selectivity is increased by reducing the amount of CO(CO plus &#xbd; CO) in the hydrodesulfurization reaction zone to less than 100 vppm. While this is useful for non-selective hydrodesulfurization, it is particularly useful for selectively desulfurizing an olefin-containing naphtha without octane loss due to olefin saturation by hydrogenation. The COreduction is achieved by removing COfrom the treat gas before it is passed into the reaction zone.

Low CO for increased naphtha desulfurization

A two stage process for selectively hydrodesulfurizing olefinic and sulfur and nitrogen-containing naphtha feedstreams wherein the first stage is a nitrogen removal stage to produce a naphtha feedstream having reduced levels of nitrogen compounds and a second stage wherein the naphtha feedstream having reduced levels of nitrogen compounds is hydrodesulfuried with a catalyst and under conditions selective to remove sulfur with minimum olefin saturation.

Nitrogen removal from olefinic naphtha feedstreams to improve hydrodesulfurization versus olefin saturation selectivity

A process for the selective hydrodesulfurization of naphtha streams containing a substantial amount of olefins and organically bound sulfur. The naphtha stream is selectively hydrodesulfurized by passing it through a first reaction zone containing a bed of a first hydrodesulfurization catalyst, then passing the resulting product stream through a second reaction zone containing a bed of a second hydrodesulfurization catalyst, which second hydrodesulfurization catalyst contains a lower level of catalytic metals than the first hydrodesulfurization catalyst.

Multi-stage hydrodesulfurization of cracked naphtha streams with a stacked bed reactor

A process for producing a naphtha having a decreased amount of sulfur by selective hydroprocessing a petroleum feedstream comprising cracked naphtha to reduce its sulfur content with minimum loss of octane. The reduced sulfur naphtha stream contains mercaptan sulfur reversion products that are removed preferably by use of an aqueous base solution containing a catalytically effective amount of a phase transfer catalyst.

Selective hydroprocessing and mercaptan removal

A process for the selective hydrodesulfurization of naphtha streams containing sulfur and olefins. A substantially olefins-free naphtha stream is blended with an olefins/sulfur-containing naphtha stream and hydrodesulfurized resulting in the substantial removal of sulfur without excessive olefin saturation.

Selective hydrodesulfurization of naphtha streams

Selectively suppressing catalytic hydrogenation

A process for the selective hydrodesulfurization of olefinic naphtha streams containing a substantial amount of organically bound sulfur and olefins. The olefinic naphtha stream is selectively hydrodesulfurized in a first sulfur removal stage and resulting product stream, which contains hydrogen sulfide and organosulfur is fractionated at a temperature to produce a light fraction containing less than about 100 wppm organically bound sulfur and a heavy fraction containing greater than about 100 wppm organically bound sulfur. The light fraction is stripped of at least a portion ofits hydrogen sulfide and can be collected or passed to gasoline blending. The heavy fraction is passed to a second sulfur removal stage wherein at least a portion of any remaining organically bound sulfur is removed.

Multi-stage hydrodesulfurization of cracked naphtha streams with interstage fractionation

An improved catalyst activation process for olefinic naphtha hydrodesulfurization. This process maintains the sulfur removal activity of the catalyst while reducing the olefin saturation activity.

Method for selective cat naphtha hydrodesulfurization

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Clinton, LA, United States of America

Garland B Brignac