PROCESS FOR PREPARING ETHYLENE AND PROPYLENE FROM A FEEDSTOCK COMPRISING A TERT-ALKYL ETHER

摘要

The present invention provides a process for preparing ethylene and/or propylene, comprising the steps of: a)providing an oxygenate-comprising feedstock; b)contacting the oxygenate-comprising feedstock with a molecular sieve-comprising catalyst at a temperature in the range of from 450 to 700°C and converting at least part of the oxygenateinto an olefinic product comprising ethylene and/or propylene;and c)retrieving the olefinic product, wherein the oxygenate-comprising feedstock comprises in the range of from 1 to 97wt% of at least one tert-alkyl ether selected from the group MTBE, ETBE, TAME and TAEE, based on theweight of the oxygenates in the oxygenate-comprising feedstock,and further comprises methanol and/or DME.