Exxonmobil Chemical Patents Inc.

Robert A Crane

John Scott Buchanan

Gary David Mohr

Jihad Mohammed Dakka

Larry Lee Iaccino

Xiaobing Feng

David Lawrence Stern

Christine Nicole Elia

Shifang Luke Luo

Brenda Anne Raich

Ronald Joseph Cimini

Jose G Santiesteban

Hye-Kyung Cho Timken

Lei Zhang

Jeevan Sahib Abichandani

William Alois Weber

David Anthony Stachelczyk

Teresa A Jurgens-Kowal

Jose′ Guadalupe Santiesteban

Wenyih Frank Lai

Arthur W Chester

Doron Levin

Jean Willem Beeckman

Dominick N Mazzone

Daria N Lissy

William G Borghard

Glenn R Sweeten

Timothy Edward McMinn

Frank Lai

Andrew M Hiester

Owen C Feeley

John C Fried

This invention relates to a process for the selective alkylation of toluene and/or benzene with an oxygen-containing alkylation agent. In particular, the process uses a selectivated molecular sieve which has been modified by the addition of a hydrogenation component, wherein at least one of the following conditions is met: (a) the selectivated molecular sieve has an alpha value of less than 100 prior to the addition of the hydrogenation component, or (b) the selectivated and hydrogenated catalyst has an alpha value of less than 100. The process of this invention provides high selectivity for the alkylated product while reducing catalyst degradation.

Process for aromatic alkylation

A process is provided for the production of xylenes from reformate. The process is carried out by methylating the benzene, toluene, or both present in the reformate to produce a resulting product having a higher xylenes content than the reformate. Greater than equilibrium amounts of para-xylene can be produced by the process.

Manufacture of xylenes from reformate

In a process for converting C+ aromatic hydrocarbons to lighter aromatic products a feed comprising C+ aromatic hydrocarbons is contacted under transalkylation reaction conditions with a catalyst composition comprising (i) a first molecular sieve selected from the group consisting of ZSM-12, mordenite and a porous crystalline inorganic oxide material having an X-ray diffraction pattern including d-spacing maxima at 12.4&#xb1;0.25, 6.9&#xb1;0.15, 3.57&#xb1;0.07 and 3.42&#xb1;0.07; and (ii) a second molecular sieve having a constraint index ranging from 3 to 12. At least the first molecular sieve has a hydrogenation component associated therewith and the first and second molecular sieves are contained in the same catalyst bed. The C+ aromatic hydrocarbons are converted under the transalkylation reaction conditions to a reaction product containing xylene.

Using a catalyst having two different zeolites for transalkylation of a C9+ aromatic feed

A process for controlling the hydrogenation activity of a catalyst comprised of a crystalline molecular sieve and at least one hydrogenation metal selected from the group consisting of a Group VIIB metal, a Group VIII metal, and mixtures thereof. The process is carried out by contacting the catalyst with hydrogen under sufficient conditions of temperature and pressure and for sufficient time to reduce the hydrogenolysis activity of the catalyst. The catalyst prepared by the process finds application in the catalytic conversion of organic compounds, such as ethylbenzene dealkylation, xylenes isomerization, and the transalkylation of polyalkylaromatic hydrocarbons.

Process for producing catalysts with reduced hydrogenation activity and use thereof

A process is provided for the production of xylenes from reformate. The process is carried out by methylating under conditions effective for the methylation, the benzene/toluene present in the reformate outside the reforming loop, to produce a resulting product having a higher xylenes content than the reformate. Greater than equilibrium amounts of para-xylene can be produced by the process.

Manufacture of xylenes using reformate

In a process for preparing a selectivated catalyst composition useful in the disproportionation of toluene, a catalyst comprising an acidic molecular sieve is contacted with a boron compound at a temperature in excess of 500&#xb0; C.; and the resultant catalyst is then contacted with a medium containing hydrogen ions to at least partially restore the acid activity of the molecular sieve.

Selectivation of molecular sieve catalysts and use therof in hydrocarbon conversion

A catalyst system that exhibits a ratio of ethylene saturation to aromatics ring saturation of greater than 3,500. The catalyst system comprises two components and each component comprises a crystalline molecular sieve having a Constraint Index of from about 1 to about 12 and an effective amount of Group VIII metal. The catalyst system finds particular application in ethylbenzene conversion/xylenes isomerization reactions. The catalyst system can be prepared by incorporating the Group VIII metal into the molecular sieves by competitive ion exchange.

Xylenes isomerization catalyst system and use thereof

A process is provided for the production of xylenes from reformate by reactive distillation. The process is carried out by methylating the benzene/toluene present in the reformate in a reactive distillation zone and under reactive distillation conditions to produce a resulting product having a higher xylenes content than the reformate. Greater than equilibrium amounts of para-xylene can be produced by the process.

Manufacture of xylenes by reactive distillation of reformate

Heavy aromatics processing

An ethylbenzene conversion catalyst is described which comprises a molecular sieve and a hydrogenation metal, wherein the catalyst exhibits a benzene hydrogenation activity at 100&#xb0; C. of less than about 100 and a metal dispersion, as measured by hydrogen chemisorption, greater than 0.4 and wherein the molecular sieve is steamed to an alpha value of less than 400 prior to incorporation of the palladium with the molecular sieve.

Ethylbenzene conversion catalyst and process

Growing community of inventors

Lumberton, TX, United States of America

Robert A Crane