Mobil Oil Corporation

Kabushiki Kaisha Kobe Seiko Sho

Kobe Steel, Ltd.

Exxonmobil Chemical Patents Inc.

Mobile Oil Corporation

Ajit V Sapre

Koji Yamamoto

Masahiro Motoyuki

Tiberiu M Leib

John P McWilliams

Susan Patricia Donnelly

Diane V Jorgensen

John Paul Mc Williams

Joseph A Herbst

Frederick J Krambeck

Gerald J Teitman

Kenneth R Graziani

Catherine L Markham

Stuart Damon Hellring

Paul H Schipper

David O Marler

Scott A Stevenson

David S Shihabi

Shingo Yoshida

Jonathan E Child

Richard F Socha

Michael S Sarli

Arthur A Chin

Seiichi Yamamoto

Donald M Nace

Lloyd L Breckenridge

David H Anderson

Mary E Edgerton

Mou-neng M Lo

The present invention relates to a process of preparingdialkylnaphthylenes and polyalkylenenaphthyleneatesdialkylnaphthalenes and polyalkylenenaphthalates.

Process for preparing 2,6-dialkylnaphthalene

A process for producing 2,6-dialkylnaphthalene from a hydrocarbon feedstock that contains at least one component selected from the group consisting of dialkylnaphthalene isomers, monoalkylnaphthalene isomers, polyalkylnaphthalenes, and naphthalene, is provided that includes the following steps:

The present invention relates to a method of preparing 2,6-dimethylnaphthalene from a feed stream that contains hydrocarbons which contain dimethylnaphthalene isomers. The method includes the following steps:

Isomerization of dimethylnaphthalene to produce 2,6-dimethylnaphthalene

The present invention relates to a process of preparing dialkylnaphthylenes and polyalkylenenaphthyleneates.

2,6-Dialkylnaphthalene is prepared from a feedstock comprising naphthalene and an alkylating agent, by a process comprising the steps: (I) transalkylating isomers of dialkylnaphthalene and naphthalene to produce monoalkylnaphthalene and isomers of dialkylnaphthalene; (II) separating the product obtained in step (I) into naphthalene, monoalkylnaphthalene, dialkylnaphthalene and other components; (III) alkylating the monoalkylnaphthalene fraction from step (II) with an alkylating agent to produce dialkylnaphthalene; and (IV) separating 2,6-dialkylnaphthalene from the dialkylnaphthalene fraction in step (II), wherein at least step (I) or step (III) is conducted in the presence of a catalyst having a composition comprising a synthetic zeolite having an X-ray diffraction pattern with an interplanar d-spacing (.ANG.)

Process for preparing dialkylnaphthalene

A process for producing 2-methylnaphthalene from a feedstock containing 1-methylnaphthalene by contacting the feedstock with a catalyst composition, in which the process comprising isomerization of 1-methylnaphthalene, wherein the catalyst composition comprising a synthetic zeolite characterized by an X-ray diffraction pattern including interplanar d-spacing as set forth in Table A of the specification.

Process for preparing 2-methylnaphthalene

An improved process and apparatus are disclosed for fluidized catalytic cracking of hydrocarbons using a cross-flow or swirl type catalyst regenerator. Instead of a single catalyst withdrawal outlet for regenerated catalyst, multiple catalyst withdrawal points are provided. Use of multiple catalyst outlets, or a continuous radial catalyst outlet, greatly reduces stagnant regions in the bed.

Catalytic cracking apparatus using regenerator with multiple catalyst

Catalyst stripping in the fluid catalytic cracking process is improved by cooling the spent catalyst to quench catalytic condensation reactions, then stripping the cooled catalyst in a primary stripper, followed by heating and a stage of hot stripping. Quenched stripping reduces coke make by reducing conversion of light olefins, made during the FCC process, into coke.

Quenched multistage FCC catalyst stripping

A process for thermally and catalytically upgrading a heavy feed in a single riser reactor FCC unit is disclosed. A heavy feed is added to a blast zone in the base of the riser, and sufficient hot regenerated FCC catalyst is added to induce both thermal and catalytic cracking of the heavy feed. A reactive quench material, which cools the material discharged from the blast zone is added to a quench zone downstream of the blast zone, to reduce temperature at least in part by undergoing endothermic reactions in the riser. Quench liquids can be distillable FCC feeds such as gas oil, slack wax, or alcohols or ethers. The quench material is added in an amount equal to 100 to 1000 wt % of the non-distillable material in the heavy feed. A preferred catalyst, with a high zeolite content, is used which retains activity in the quench despite initial contact with the heavy feed, which tends to overwhelm conventional FCC catalysts.

Catalytic cracking of coke producing hydrocarbons

Coke formation/deposition within and downstream of catalytic cracking reactors is suppressed by adding a coke suppressing additive to the cracking reactor and/or cracked product vapor. Free radical inhibitors, such as oxygenates, are preferred. The additive addition rate is preferably controlled based on temperature of regenerated catalyst, or a direct or indirect measurement of coke accumulation on the transfer line between the cracking reactor and the main fractionator.

Process for reducing FCC transfer line coking

Operational flexibility of a fluid catalytic cracking process is improved by indirectly cooling catalyst in an endothermic catalyst cooler. Catalyst withdrawn from the FCC unit is cooled by driving an endothermic chemical reaction, which may be either thermal or catalytic. Dehydrogenation of, e.g., light aliphatics, produced by the cracking reactor in the endothermic cooler allows the FCC unit to adapt to heavier feeds. A preferred endothermic cooler, comprising a base heat exchanger section, transport riser, and solids collection and recycle vessel is disclosed.

Cooling exothermic regenerator with endothermic reactions

An process and apparatus are disclosed for fluidized bed catalyst regeneration in a cross-flow type regenerator. A baffled coked catalyst inlet located within the dense bed of catalyst disperses and distributes coked catalyst flow in a direction generally normal to the direction of flow in the catalyst inlet. The baffle significantly reduces the stagnant regions in the bed.

Catalytic cracking apparatus using cross-flow regenerator

A flue gas that contains small amounts of both HCN and NO.sub.x, produced, for example, by catalyst regeneration in the fluid catalytic cracking of a petroleum gas oil, is readily denitrified by the catalyzed reaction that proceeds approximately according to:

Denitrification of flue gas from catalytic cracking

An improved process for regeneration of catalyst used in fluidized catalytic cracking of hydrocarbons using a cross-flow or swirl type catalyst regenerator is disclosed. Instead of a single catalyst withdrawal outlet for regenerated catalyst, multiple catalyst withdrawal points are provided. Use of multiple catalyst outlets, or a continuous radial catalyst outlet, greatly reduces stagnant regions in the bed. The process is useful in FCC units having inventories of from 10 to 100 tons of catalyst.

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W. Berlin, NJ, United States of America

Ajit V Sapre