INTEGRATED PROCESS FOR THE PREPARATION OF A LOWER OLEFIN PRODUCT
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United States of America Patent
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Issued Date -
Jun 27, 2013
app pub date -
Dec 27, 2012
filing date -
Dec 27, 2011
priority date (Note) -
Abandoned
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Abstract
A process for the preparation of an olefin product comprising ethylene, comprising a) cracking a cracker feedstock to obtain a cracker effluent comprising olefins; b) converting an oxygenate feedstock in an oxygenate-to-olefins conversion system, comprising a reaction zone in which an oxygenate feedstock is contacted a catalyst to obtain a conversion effluent comprising ethylene and/or propylene; c) combining at least part of the cracker effluent and at least part of the conversion effluent to obtain a combined effluent wherein the combined effluent comprises a C4 portion and a C3 portion; d) separating at least a part of the propylene from the combined effluent to form a combined propylene stream; e) separating at least a part of the C4 portion from the combined effluent to form a C4 stream; and f) recycling at least a part of the combined propylene stream as recycled propylene to step b).
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