Exxon Research and Engineering Company

Exxonmobil Research and Engineering Company

Exxonmobil Chemical Patents Inc.

Thomas R Halbert

Edward Ira Stiefel

Garland B Brignac

John P Greeley

Russell R Chianelli

Gordon Frederick Stuntz

Bruce R Cook

Richard A Demmin

Garland Barry Brignac

Catherine L Coyle

Liwen Wei

John Peter Greeley

Kenneth L Riley

Allan J Jacobson

Teh Chung Ho

Edward Stanley Ellis

Leo D Brown

Janet Renee Clark

Robert Charles Welch

Craig A McKnight

Brij N Gupta

Robert C W Welch

X B Cox, Iii

Richard Alan Demmin

Stuart Leon Soled

Roby Bearden, Jr

Sabato Miseo

William C Baird, Jr

Gary Brice McVicker

Mark Alan Greaney

Steven Alan Cohen

Chuansheng Bai

William E Winter, Jr

Andrzej Malek

Michele Sue Touvelle

Valery Sokolovskii

Jonathan Martin McConnachie

David M Lowe

Paul K Ladwig

Anthony F Volpe

William Joseph Novak

Gopal H Singhal

Andrzej Mariusz Malek

Jason Wu

April D Ross

Craig McKnight

Jun Han

Richard P Rhodes

Kenneth L Trachte

Wie-Hin Pan

Peter W Jacobs

Madhav Acharya

John G Matragrano

David Lee Vannauker

Mark P Lapinski

Martin C Poole

William E Winter

Andrew C Moreland

Jeffrey M Dysard

Jeffrey L Kaufman

Gophal H Singhal

Stephen D Reynolds

Theresa A Lalain

John C Coker

Theresa A Lelain

Chu Siang Loo

William Lasko

Peter J Guzi

Brij Gupta

Bruce Randall Cook

Gary Brice Mcvicker

Brigenda N Gupta

Chu-Siang Loo

William Edward Winter

John Calvin Coker

Brijenda N Gupta

Robert Charles William Welch

The invention includes a hydrotreating method for increased CO content comprising: contacting an olefinic naphtha feedstream with a hydrogen-containing treat gas stream and a hydrotreating catalyst in a reactor under hydrotreating conditions sufficient to at least partially hydrodesulfurize and/or hydrodenitrogenate the feedstream, wherein the feedstream and the hydrogen-containing treat gas stream collectively have greater than 10 vppm CO content and/or wherein the reactor inlet sees an average CO concentration of greater than 10 vppm, wherein the hydrotreating catalyst comprises a catalyst having cobalt and molybdenum disposed on a silica-based support, and wherein the hydrotreating conditions are selected such that the catalyst has a relative HDS activity at least 10% greater than an identical catalyst under identical conditions except for a collective CO content of the feedstream and/or hydrogen-containing treat gas being &#x3c;10 vppm and/or a reactor inlet CO content &#x3c;10 vppm.

Hydroprocessing methods utilizing carbon oxide-tolerant catalysts

A method for hydrodesulfurizing FCC naphtha is described. More particularly, a Co/Mo metal hydrogenation component is loaded on a silica or modified silica support in the presence of organic ligand and sulfided to produce a catalyst which is then used for hydrodesulfurizing FCC naphtha. The silica support has a defined pore size distribution which minimizes olefin saturation.

Selective catalysts having silica supports for naphtha hydrodesulfurization

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

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

A three-step process of removing sulfur from naphtha feeds. The steps include a first hydrotreating step, a mercaptan removal agent and an adsorbent containing a reactive metal on an inorganic support. Step one removes at least 95 wt. % of the sulfur compounds while preserving at least 50 wt. % of the olefins. Treatment with the mercaptan removal agent lowers the sulfur content to 30 wppm total sulfur and final naphtha product contains leas than 10 wppm total sulfur.

Process for removing sulfur from naphtha

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

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

The invention relates to a process for forming a low-sulfur motor gasoline and the product made therefrom. In one embodiment, process involves separating a catalytically cracked naphtha into at least a light fraction boiling below about 165&#xb0; F. and a heavy fraction boiling above about 165&#xb0; F. The light fraction is treated to remove sulfur by a non-hydrotreating method, and the heavy fraction is hydrotreated to remove sulfur to a level of less than about 100 ppm.

Low-sulfur fuel

The invention relates to a process for forming a low-sulfur motor gasoline and the product made therefrom. In one embodiment, process involves separating a catalytically cracked naphtha into at least a light fraction boiling below about 165&deg; F. and a heavy fraction boiling above about 165&deg; F. The light fraction is treated to remove sulfur by a non-hydrotreating method, and the heavy fraction is hydrotreated to remove sulfur to a level of less than about 100 ppm.

Low-sulfur fuel and process of making

The invention relates to a method and dual reactor system for hydrotreating a wide cut cat naphtha stream comprising heavy cat naphtha (HCN) and intermediate cat naphtha (ICN). Accordingly, a HCN fraction is hydrotreated under non-selective hydrotreating conditions and an ICN fraction is hydrotreated under selective hydrotreating conditions. The hydrotreated HCN and ICN effluents may be conducted to heat exchangers to pre-heat the ICN feed, obviating the need for a furnace.

Staged hydrotreating method for naphtha desulfurization

Naphtha desulfurization with reduced product mercaptans is achieved by reacting a naphtha feed containing sulfur compounds and olefins with hydrogen in the presence of a hydrosesulfurization catalyst at reaction conditions including a temperature of from 290-425&deg; C., a pressure of from 60-150 psig, and a hydrogen gas ratio of from 2000-4000 scf/b. It has been found that desulfurizing within these narrow conditions permits deep desulfurization with reduced mercaptan reversion, to produce a naphtha product with low total sulfur and low mercaptan sulfur levels.

Naphtha desulfurization with reduced mercaptan formation

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Baton Rouge, LA, United States of America

Thomas R Halbert