Process for preparing ethylene and/or propylene and a butadiene-enriched product
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United States of America Patent
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Apr 1, 2014
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app pub date -
Sep 7, 2012
filing date -
Sep 7, 2011
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Abstract
The present invention provides a process for preparing ethylene and propylene and a butadiene-enriched product, comprising the steps of:
- a) providing a C4 hydrocarbon stream, comprising iso-olefins and butadiene.b) subjecting the C4 hydrocarbon stream to an etherification process, wherein the iso-olefins are converted with methanol and/or ethanol to an tert-alkyl ether in the presence of a catalyst, wherein the molar ratio of alcohol to iso-olefin is maintained above 1, and retrieving an etherification product stream;c) separating the etherification product stream into an ether-enriched stream and a butadiene-enriched product;d) converting the tert-alkyl ether in the ether-enriched stream to ethylene and/or propylene by contacting least part of the ether-enriched stream with a molecular sieve-comprising catalyst at a temperature in the range of from 350 to 1000° C. and retrieving an olefinic product comprising ethylene and/or propylene.
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