Catalyst pretreatment with dimethyl ether in an oxygenate to...

Details Catalyst pretreatment with dimethyl ether in an oxygenate to... Catalyst pretreatment with dimethyl ether in an oxygenate to...

2006-05-16

2006-05-16

Griffin, Walter D. (Department: 1764)

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

From nonhydrocarbon feed

C585S639000

Reexamination Certificate

active

07045672

ABSTRACT:
This invention relates to processes for converting oxygenates to olefins and olefins to polyolefins. The processes include a step of pretreating molecular sieve used in the conversion of oxygenate to olefin with a dimethyl ether composition. Fresh or regenerated molecular sieve, which is low in carbon content, is contacted or pretreated with the dimethyl ether composition to form a hydrocarbon co-catalyst within the pore structure of the molecular sieve, and the pretreated molecular sieve containing the co-catalyst is used to convert oxygenate to a lighter olefin product.

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Derwent World Patents Abstract—DD 270 526, “Ethene, Propene and Butene Prodn. From Methanol and/or Dimethyl Ether—Using Pentasil Zeolite Catalyst Contg. Phosphorus Pretreated to Prolong Activity,” Aug. 2, 1989, Inventors: Bohnke I.; Eckeit R.; Jerschkew H.G.; Lischke G.; Ohlmann G.; Striegler H.; Timm D.; and Wehner K.

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