The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 2014
Filed:
Sep. 07, 2012
Leslie Andrew Chewter, Amsterdam, NL;
Rajaram Ramesh, Amsterdam, NL;
Jeroen Van Westrenen, Amsterdam, NL;
Leslie Andrew Chewter, Amsterdam, NL;
Rajaram Ramesh, Amsterdam, NL;
Jeroen Van Westrenen, Amsterdam, NL;
Shell Oil Company, Houston, TX (US);
Abstract
The present invention provides a process for preparing ethylene and/or propylene, comprising the steps of contacting a stream comprising C4+ olefins with a zeolite-comprising catalyst to retrieve an olefinic product stream comprising ethylene and/or propylene, and a C4+ hydrocarbon fraction, comprising paraffins, normal olefins and iso-olefins. The C4+ hydrocarbon fraction is subjected to an etherification process with wherein at least part of the iso-olefins are converted with methanol and/or ethanol to an tert-alkyl ether and an etherification product stream is retrieved and separated into an ether-enriched stream and an iso-olefin-depleted C4+ hydrocarbon stream. Part of the iso-olefin-depleted C4+ hydrocarbon stream from the process to purge part of the paraffinic C4+ hydrocarbons while another part of the iso-olefin-depleted C4+ hydrocarbon stream is recycled. The tert-alkyl ether in the ether-enriched stream is converted to ethylene and/or propylene by contacting at least part of the ether-enriched stream with a molecular sieve-comprising catalyst.