Exxonmobil Chemical Patents Inc.

Jesse Frederick Goellner

James Harding Beech, Jr

James Richardson Lattner

Stephen Neil Vaughn

Kenneth Ray Clem

Rutton D Patel

Teng Xu

Luc R M Martens

Nicolas P Coute

Peter Loezos

Yun-Feng Chang

Richard B Hall

Michael Peter Nicoletti

Chunshe J Cao

Jeffrey Scott Smith

Timothy M Healy

David C Skouby

Mareel J Janssen

Richard C Senior

This invention relates to efficiently regenerating catalyst particles by minimizing the formation of localized 'hot spots' and 'cold spots' in a regeneration zone. Specifically this invention relates to a method for controlling regenerator temperature in an oxygenates-to-olefins system, comprising the steps of: contacting an oxygenate feed in a reactor with a catalytically effective amount of molecular sieve-containing catalyst under conditions effective for converting said oxygenate to a product containing light olefins and forming a coked catalyst; contacting a portion of the coked catalyst in a regenerator, having a catalyst bed height (H), an inlet height (H), and an outlet height (H), with an oxygen-containing regeneration medium under conditions effective to at least partially regenerate the coked catalyst; and conducting a portion of the catalyst from the regenerator to a catalyst cooler to form a cooled catalyst portion, wherein His greater than H.

Method of circulating catalyst between a catalyst regenerator and an external catalyst cooler

This invention is directed to methods of converting oxygenates to olefin products. The methods provided include steps for protecting against deactivation of active molecular sieve catalysts during the conversion process. In particular, the invention provides for methods of regenerating coked catalyst to minimize catalyst deactivation due to contact with moisture.

Stabilizing catalyst activity during catalyst regeneration

A multi-stage gas-solids separator is configured so that the higher density (solids) output flows of two or more of the separator stages are merged together. The multi-stage separator is preferably composed of cyclone separators, with the diplegs of at least two of the cyclone separator stages merged together.

Gas-solids separation device and method

This invention provides processes for maintaining a desired particle size distribution in an oxygenate to olefin reaction system. In one embodiment, the invention comprises replacing lost catalyst fines with less active co-catalyst particles. By adding less active co-catalyst particles to the reaction system, desirable fluidization characteristics and hydrodynamics can be maintained without affecting the overall (or primary catalyst) performance and product selectivities. The invention is also directed to a population of catalyst particles having a desirable particle size distribution well-suited for realizing ideal fluidization and hydrodynamic characteristics.

Fines co-feed for maintaining efficient reactor hydrodynamics

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Pittsburgh, PA, United States of America

Jesse Frederick Goellner