Process for preparing ethylene and/or propylene

A process for preparing ethylene and/or propylene, comprising the steps of:

• a) providing an oxygenate feed comprising oxygenate and C4 olefins to a first reaction zone;
• b) contacting in the first reaction zone the oxygenate feed with a first zeolite-comprising catalyst at a temperature in the range of from 350 to 1000° C. and retrieving from the first reaction zone a first effluent stream comprising at least C2 to C5 olefins;
• c) separating the first effluent stream into at least:
• i. a first product stream comprising C2 and/or C3 olefins;
• ii. a second fraction comprising C4 olefins;
• and
• iii. a third fraction comprising C5 olefins;
• d) recycling at least part of the second fraction to the first reaction zone as part of the oxygenate feed;
• e) providing an olefinic feed comprising C5 olefins to a second reaction zone, wherein the olefinic feed comprises at least part of the third fraction;
• and
• f) contacting in the second reaction zone the olefinic feed with a second zeolite-comprising catalyst at a temperature in the range of from 500 to 700° C. and retrieving from the second reaction zone a second effluent stream comprising at least C2 to C3 olefins.