Exxonmobil Chemical Patents Inc.

Exxon Research and Engineering Company

Exxon Chemical Patents, Inc.

Exxonmobil Research and Engineering Company

Exxonmobile Chemical Patents Inc.

Exxon Mobil Chemical, Inc.

Tan-Jen Chen

Terry Eugene Helton

Jihad Mohammed Dakka

John Scott Buchanan

Jane C Cheng

Teng Xu

Christopher Lynn Becker

Francisco Manuel Benitez

Seth McConkie Washburn

James Richardson Lattner

Charles Morris Smith

Gabor Kiss

Jon E Stanat

Thomas Elmer Green

Shun Chong Fung

Gordon Frederick Stuntz

William A Wachter

Paul K Ladwig

Philip Andrew Ruziska

Paul F Keusenkothen

Sabato Miseo

Neeraj Sangar

Luc Roger Martens

Edward A Lemon

Lorenzo Cophard DeCaul

John E Asplin

Hsu Chiang

Keith Holroyd Kuechler

Wenyih Frank Lai

David Lawrence Stern

Guang Cao

Paul E Eberly

Jeevan Sahib Abichandani

Marcel Johannes Janssen

Jason D Davis

Hari Nair

Michael Salciccioli

Glenn Allen Heeter

Kirk C Nadler

Jörg F W Weber

Brian Erik Henry

William Anthony Lamberti

Jose M Vargas

Ali A Kheir

Charles P Darnell

Dean L Smith, Jr

Ashley J Malik

William C Horn

John Ernest Asplin

Prasenjeet Ghosh

Aaron B Pavlish

Matthew William Holtcamp

Stuart Leon Soled

Kun Wang

Machteld Maria Mertens

Larry Lee Iaccino

Doron Levin

Stephen Zushma

Luc R M Martens

Edward Stanley Ellis

William E Winter, Jr

Robert G Tinger

Matthew J Vincent

John Di-Yi Ou

Michele Sue Touvelle

Joseph Ernest Baumgartner

Matu J Shah

Marcel J G Janssen

Lorenzo C DeCaul

Christine Esther Kliewer

Ronald G Searle

Donald T Bray

Joseph L Feimer

Darryl Patrick Klein

Luc Roger Marc Martens

Francis X Mayer

Brett Thomas Loveless

J Scott Buchanan

John D Ou

Todd E Detjen

S Mark Davis

Renuka N Ganesh

Jane Chi-Ya Cheng

William L Schuette

Richard John Basile

Catherine M Dorsi

Anthony Go

Travis A Reine

Jannetje Maatje Van Den Berge

David H Hopkins

Emiel De Smit

B Erik Henry

Joseph F Carpency

James R Sweet

Ryan A Sothen

John Di Yi Ou

Jay F Carpency

Umar Aslam

Brian Eric Henry

J Jason Wu

This disclosure provides an improved process for converting benzene/toluene via methylation with methanol/dimethyl ether for producing, e.g., p-xylene, comprising separating and recycling dimethyl ether from the methylation reaction product mixture effluent to the methylation reactor. High selectivity toward p-xylene, among others, can be achieved.

Processes and systems for converting benzene and/or toluene via methylation

A process is described for producing paraxylene, in which an aromatic hydrocarbon feedstock comprising benzene and/or toluene is contacted with an alkylating reagent comprising methanol and/or dimethyl ether in an alkylation reaction zone under alkylation conditions in the presence of an alkylation catalyst to produce an alkylated aromatic product comprising xylenes. The alkylation catalyst comprises a molecular sieve having a Constraint Index&#x2264;5, and the alkylation conditions comprise a temperature less than 500&#xb0; C. Paraxylene may then be recovered from the alkylated aromatic product.

Process for producing paraxylene by methylation of benzene and/or toluene

A process is described for producing paraxylene, in which an aromatic hydrocarbon feedstock comprising benzene and/or toluene is contacted with an alkylating reagent comprising methanol and/or dimethyl ether in an alkylation reaction zone under alkylation conditions in the presence of an alkylation catalyst to produce an alkylated aromatic product comprising xylenes. The alkylation catalyst comprises a molecular sieve having a Constraint Index&#x2264;5, and the alkylation conditions comprise a temperature less than 500&#xb0; C. The alkylation catalyst may be selectivated to produce a higher than equilibrium amount of paraxylene by using a molar ratio of alkylating agent to aromatic of at least 1:4.

Process for selectivating catalyst for producing paraxylene by methylation of benzene and/or toluene

This disclosure provides improved processes for converting benzene/toluene via methylation with methanol/dimethyl ether for producing, e.g., p-xylene. In an embodiment, a process comprises contacting a methylation agent feed with an aromatic hydrocarbon feed in the presence of a methylation catalyst in a methylation reactor at increased pressure. Reduced methylation catalyst deactivation can be achieved with increased pressure in the methylation reactor.

Processes for converting benzene and/or toluene via methylation

This disclosure provides improved processes for converting aromatic hydrocarbons, such as benzene/toluene, alkylation, transalkylation, or isomerization. In an embodiment, a process comprises utilizing a passivated reactor to reduce deactivation of a molecular sieve catalyst. Additional measures such as the use of an auxiliary catalyst and/or an elevated reactor pressure may be used to further reduce deactivation of the molecular sieve catalyst.

Processes for converting aromatic hydrocarbons using passivated reactor

Disclosed is a process for producing mixed xylenes and Chydrocarbons in which an aromatic hydrocarbon feedstock comprising benzene and/or toluene is contacted with an alkylating agent comprising methanol and/or dimethyl ether under alkylation conditions in the presence of an alkylation catalyst to produce an alkylated aromatic product stream comprising the mixed xylenes and Chydrocarbons. The mixed xylenes are subsequently converted to para-xylene, and the Chydrocarbons and its components may be supplied as motor fuels blending components. The alkylation catalyst comprises a molecular sieve having a Constraint Index in the range from greater than zero up to about 3. The molar ratio of aromatic hydrocarbon to alkylating agent is in the range of greater than 1:1 to less than 4:1.

Process for co-production of mixed xylenes and high octane Caromatics

In a process for producing paraxylene, a hydrocarbon feedstock comprising benzene and/or toluene is contacted with an alkylating reagent comprising methanol and/or dimethyl ether in an alkylation reaction zone under alkylation conditions in the presence of an alkylation catalyst to produce an alkylated product comprising xylenes. The alkylation catalyst comprises a molecular sieve having a Constraint Index &#x2264;5, and the alkylation conditions comprise a temperature less than 500&#xb0; C. At least part of the alkylated product is supplied to a paraxylene recovery unit to recover paraxylene and produce a paraxylene-depleted stream, which is then contacted with a xylene isomerization catalyst under conditions effective to isomerize xylenes in the paraxylene-depleted stream and produce an isomerized stream having a higher concentration of paraxylene than the paraxylene-depleted stream. At least part of the isomerized stream is then recycled to the paraxylene recovery unit to recover the paraxylene therein.

Process for methylating aromatic hydrocarbons

Disclosed are novel processes for making cyclohexanone compositions, from a mixture comprising phenol, cyclohexanone, and cyclohexylbenzene. The process includes hydrogenation of a feed stream comprising phenol, cyclohexanone, and cyclohexylbenzene. The feed stream may be subjected to one or more pre-hydrogenation treatments, such as passing through one or more sorbents, addition of basic chemical agents, and/or addition of water, so as to improve catalyst activity, minimize undesired side reactions, and/or remove catalyst poisons from the feed stream. The feed stream may be provided to a hydrogenation reaction zone in the vapor phase, with periodic alterations to hydrogenation reaction conditions such that the feed is provided in mixed liquid and vapor phase in order to carry out liquid washing of a hydrogenation catalyst bed within the hydrogenation reaction zone.

Process for making cyclohexanone

A process is described for producing paraxylene, in which an aromatic hydrocarbon feedstock comprising benzene and/or toluene is contacted with an alkylating reagent comprising methanol and/or dimethyl ether in an alkylation reaction zone under alkylation conditions in the presence of an alkylation catalyst to produce an alkylated aromatic product comprising xylenes. The alkylation catalyst comprises a molecular sieve having a Constraint Index &#x2264;5, and the alkylation conditions comprise a temperature less than 500&#xb0; C. Paraxylene may then be recovered from the alkylated aromatic product.

A process is described for producing paraxylene, in which an aromatic hydrocarbon feedstock comprising benzene and/or toluene is contacted with an alkylating reagent comprising methanol and/or dimethyl ether in an alkylation reaction zone under alkylation conditions in the presence of an alkylation catalyst to produce an alkylated aromatic product comprising xylenes. The alkylation catalyst comprises a molecular sieve having a Constraint Index &#x2264;5, and the alkylation conditions comprise a temperature less than 500&#xb0; C. The alkylation catalyst may be selectivated to produce a higher than equilibrium amount of paraxylene by using a molar ratio of alkylating agent to aromatic of at least 1:4.

Processes for selectively alkylating and/or dealkylating one ring of cyclohexylbenzyl and/or biphenyl compounds are provided. Such selective alkylation and/or dealkylation takes place through a transalkylation reaction between the cyclohexylbenzyl compound and a substituted or unsubstituted benzene, which replaces the phenyl moiety of the cyclohexylbenzyl compound. The transalkylated cyclohexylbenzyl may be dehydrogenated to give a corresponding biphenyl compound. The same reaction steps can be utilized with respect to biphenyl compounds by first partially hydrogenating one phenyl ring of the biphenyl compound, thereby obtaining a corresponding cyclohexylbenzyl compound, which may undergo the transalkylation and, optionally, subsequent dehydrogenation. Combinations of any two or more of partial hydrogenation, transalkylation, and dehydrogenation enable targeted substitution (or de-substitution) of only one ring of cyclohexylbenzyl and/or biphenyl compounds, thereby providing superior control in designing the synthesis of these compounds.

Transalkylated cyclohexylbenzyl and biphenyl compounds

The invention relates to the conversion of paraffinic hydrocarbon to oligomers of greater molecular weight and/or to aromatic hydrocarbon. The invention also relates to equipment and materials useful in such conversion, and to the use of such conversion for, e.g., natural gas upgrading. Corresponding olefinic hydrocarbon is produced from the paraffinic hydrocarbon in the presence of a dehydrogenation catalyst containing a catalytically active carbonaceous component. The corresponding olefinic hydrocarbon is then converted by oligomerization and/or dehydrocyclization in the presence of at least one molecular sieve catalyst.

Hydrocarbon conversion

In a process for producing dialkylbiphenyl compounds, a feed comprising substituted cyclohexylbenzene isomers having the formula (I): wherein each of Rand Ris an alkyl group and wherein the feed comprises m % by weight of isomers in which Ris in the 2-position, based on the total weight of substituted cyclohexylbenzene isomers in the feed; is transalkylated with a compound of formula (II): to produce a transalkylation product comprising substituted cyclohexylbenzene isomers having the formula (I) and including n % by weight of isomers in which Ris in the 2-position, based on the total weight of substituted cyclohexylbenzene isomers in the transalkylation product, wherein n&#x3c;m. At least part of the transalkylation product is then dehydrogenated under conditions effective to convert at least part of the substituted cyclohexylbenzene isomers in the transalkylation product to dialkylbiphenyl compounds.

Process for preparing dialkylbiphenyl isomer mixtures

Disclosed herein is a process for dehydrogenating a saturated cyclic hydrocarbon and/or 5-membered ring compound with a dehydrogenation catalyst. The dehydrogenation catalyst comprises: (i) 0.05 wt % to 5 wt % of a metal selected from Group 14 of the Periodic Table of Elements; and (ii) 0.1 wt % to 10 wt % of a metal selected from Groups 6 to 10 of the Periodic Table of Elements. The process is conducted under dehydrogenation conditions effective to dehydrogenate at least a portion saturated cyclic hydrocarbon and/or 5-membered ring compound.

Dehydrogenation process

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Kingwood, TX, United States of America

Tan-Jen Chen