Chemistry of hydrocarbon compounds – Unsaturated compound synthesis – By addition of entire unsaturated molecules – e.g.,...
Reexamination Certificate
2011-03-15
2011-03-15
Singh, Prem C (Department: 1771)
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
By addition of entire unsaturated molecules, e.g.,...
C585S638000, C585S639000, C585S640000, C502S038000, C502S041000, C423S210000, C422S212000, C023S3130FB
Reexamination Certificate
active
07906697
ABSTRACT:
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 (Hc), an inlet height (Hi), and an outlet height (Ho), 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 Hois greater than Hi.
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Beech, Jr. James H.
Cao Chunshe
Goellner Jesse F.
Healy Timothy M.
Lattner James R.
ExxonMobil Chemical Patents Inc.
Faulkner Kevin M.
Singh Prem C
Weisberg David M.
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