Mobil Oil Corporation

Exxonmobil Chemical Patents Inc.

Exxonmobil Corporation

Yun-Yang Huang

Rene B LaPierre

Chaya R Venkat

Ronald A Weiss

John P McWilliams

Philip Varghese

William D McHale

Ronald H Fischer

Thomas Francis Degnan, Jr

Thomas F Degnan

Joseph A Herbst

Edward J Rosinski

Robert P Absil

John R Green

John P Mcwilliams

Thomas Francis Degnan

A process is described for removing polar compounds from an aromatic feedstock which contains polar compounds. The process comprises contacting the feedstock in an adsorption zone at a temperature of less than or equal to 130&deg; C. with an adsorbent selective for the adsorption of said polar compounds and comprising a molecular sieve having surface cavities with cross-sectional dimensions greater than 5.6 Angstroms. A treated feedstock substantially free of said polar compounds can then be fed to an alkylation zone for contact under liquid phase alkylation conditions with an alkylating agent in the presence of an alkylation catalyst.

Removal of polar contaminants from aromatic feedstocks

A process is described for removing polar compounds from an aromatic feedstock which contains polar compounds and which is then used in an alkylation process. The process comprises contacting the feedstock in an adsorption zone at a temperature of less than or equal to 130&deg; C. with an adsorbent selective for the adsorption of said polar compounds and comprising a molecular sieve having pores and/or surface cavities with cross-sectional dimensions greater than 5.6 Angstroms. A treated feedstock substantially free of said polar compounds is withdrawn from the adsorption zone and fed to an alkylation zone for contact under liquid phase alkylation conditions with an alkylating agent in the presence of an alkylation catalyst.

Removable of polar contaminants from aromatic feedstocks

Akylation product is contacted with a purification medium in a liquid phase pre-reaction step to remove impurities and form a purified stream. The purified stream may then be further processed by liquid phase transalkylation to convert the polyalkylated aromatic compound to a monoalkylated aromatic compound. The process may use a large pore molecular sieve catalyst such as MCM-22 as the purification medium in the pre-reaction step because of its high reactivity for alkylation, strong retention of catalyst poisons and low reactivity for oligomerization under the pre-reactor conditions. Olefins, diolefins, styrene, oxygenated organic compounds, sulfur containing compounds, nitrogen containing compounds and oligomeric compounds are removed.

Aromatic alkylation process

A process for dispersing or dispersing relatively large crystallites of an agglomerated Group VIII noble metal species present on a porous inorganic support is disclosed. The process includes contacting the agglomerated noble metal species, e.g., palladium or platinum, present on the support, e.g., alumina, silica or a zeolite such as ZSM-5 from which at least a major portion of any extraneous matter such as coke or other residue has previously been removed, with nitric oxide (NO) alone or in admixture with a source of halogen such as Cl.sub.2 and thereafter removing sorbed nitrogen oxide(s) and halogen, if present. The thus treated metal-loaded catalyst demonstrates substantially increased benzene hydrogenation activity (BHA) compared to the same catalyst prior to treatment indicating significant dispersion/redispersion of the metal crystallites as smaller crystallites.

Process for dispersing or redispersing a Group VIII noble metal species

A process for dispersing or redispersing relatively large crystallites of an agglomerated Group VIII noble metal species present on a porous inorganic support is disclosed. The process includes contacting the agglomerated noble metal species, e.g., palladium or platinum, present on the support, e.g., alumina, silica or a zeolite such as ZSM-5 from which at least a major portion of any extraneous matter such as coke or other residue has previously been removed, with nitric oxide (NO) alone or in admixture with a source of halogen such as Cl.sub.2 and thereafter removing sorbed nitrogen oxide(s). The thus treated metal-loaded catalyst demonstrates substantially increased benzene hydrogenation activity (BHA) compared to the same catalyst prior to treatment indicating significant dispersion/redispersion of the metal crystallities as smaller crystallities.

Process for dispersing or redispersing a group VIII noble metal species

The addition of a compound containing a complex cation of zirconium to a zeolite improves the properties of the zeolite and also improves the dispersibility characteristics of nobel metal components supported in the zeolite. The preferred zirconium compounds are the hydroxychlorides of zirconium and of zirconium and aluminum.

Nobile metal containing catalysts of improved stability

Hydrocarbon conversion catalysts containing zeolite beta as a catalytically active component, either on its own or with other zeolites, especially faujasites such as ultrastable zeolite Y (USY) are produced by including a metal cationic complex compound such as aluminum hydroxychloride or aluminum zirconium hydroxychloride as a stabilizing component to improve the hydrothermal stability and physical strength of the catalyst. The zeolites may be formulated into catalysts for catalytic cracking, hydrocracking, dewaxing, alkylation, isomerization, hydration and other hydrocarbon conversion processes using porous matrix materials such as silica, silica alumina or clays.

Zeolite beta containing hydrocarbon conversion catalyst of stability

A moderate pressure hydrocracking process in which a highly aromatic, substantially dealkylated feedstock is processed directly to high octane gasoline by hydrocracking over a catalyst, preferably comprising a large pore size, crystalline alumino-silicate zeolite hydrocracking catalyst such as zeolite Y together with a hydrogenation-dehydrogenation component. The feedstock which is preferably a light cycle oil has an aromatic content of at least 50, usually at least 60 percent and an API gravity not more than 25. The hydrocracking typically operates at 600-1000 psig at moderate to high conversion leavels to maximize the production of monocyclic aromatics which provide the requisite octane value to the product gasoline. The unconverted products from the hydrocracker are recyclied to the catalytic cracking unit to obtain further improvements in gasoline yield and octane.

Production of high octane gasoline by hydrocracking catalytic cracking

A moderate pressure hydrocracking process is disclosed in which substantially dealkylated heavy distillate feedstocks are processed directly to high octane gasoline over a catalyst, preferably comprising a crystalline silicate zeolite hydrocracking component having a Constraint Index less than 2. The bottoms fraction produced from the contacting may be passed to an FCC unit for further processing. In another embodiment, the substantially dealkylated heavy distillate feedstock may be fractionated into a lighter boiling stream and a heavier boiling stream for better ease of processing.

Production of high octane gasoline

The present invention is direction to a unique extrusion die which may be employed in the extrusion of materials wherein a specific desired cross section is sought. The die comprises a center plate and one or more outer annular parts. Shaped holes, from which the material being extruded is emitted, are aligned at the respective edges of the center plate and the surrounding outer annular part. The die may be fabricated utilizing conventional equipment and may be employed to achieve extremely detailed cross sectional configurations of extruded materials.

Extrusion die for shaped extrudate

The present invention relates to novel cross-section shapes which are employed to form catalytic extrudates which may be employed in catalytically promoted processes including hydrocarbon processing operations. Such shapes include essentially rectangular shaped tubes, and triangular shaped tubes in cross section.

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Voorhees, NJ, United States of America

Yun-Yang Huang