Purge gas streams to stagnant zones within...

Details Purge gas streams to stagnant zones within... Purge gas streams to stagnant zones within...

2008-05-07

2009-11-24

Bullock, In Suk (Department: 1797)

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

From nonhydrocarbon feed

C585S639000

Reexamination Certificate

active

07622626

ABSTRACT:
The present invention comprises a process for conversion of oxygenates to olefins comprising contacting within a reactor the oxygenates with a catalyst to produce light olefins and wherein the reactor comprises at least two zones, a first zone wherein gas circulates at a faster rate than a second zone wherein a gas circulates at a slower rate; and inserting a quantity of inert gas into the second zone to increase circulation of any materials located in said second zone. The invention prevents accumulation of undesirable by-products within stagnant zones within the reactor and reduces the amount of coke deposited on catalyst or on surfaces within these zones.

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