High pressure oxygenate conversion process via diluent co-feed
AssigneeExxonMobil Chemical Patents Inc.
InventorsKeith H. Kuechler, Stephen N. Vaughn, Gary F. Janda, Russell D. Sellen
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Abstract
This invention relates to a method for converting an oxygenate feedstock to an olefin product. In particular, this invention relates to a method for converting an oxygenate feedstock, including a diluent co-feed, to an olefin product, by contacting the feedstock with a silicoaluminophosphate catalyst at a high total pressure of the feedstock while maintaining a low partial pressure of the oxygenates undergoing reaction.
Claims43
A method for making an olefin product from an oxygenate-containing feedstock including an oxygenate and a diluent, comprising:
- contacting, in a reactor, the oxygenate-containing feedstock with a silicoaluminophosphate molecular sieve under conditions effective to form an olefin composition comprising ethylene and propylene;
- and
- cooling at least a portion of the olefin composition to form an olefin vapor stream having a pressure of at least 165 psia and a liquid stream;
- wherein the total pressure of the oxygenate-containing feedstock at an entrance of the reactor is from 180 psia to 600 psia, and the partial pressure of the oxygenate at the entrance of the reactor is from 15 psia to 71.7 psia.
A method for making an olefin product from an oxygenate-containing feedstock including an oxygenate and a diluent, comprising:
- contacting, in a reactor, an oxygenate-containing feedstock with a silicoaluminophosphate molecular sieve under conditions effective to form an olefin composition comprising ethylene and propylene;
- cooling at least a portion of the olefin composition to form an olefin vapor stream;
- and
- introducing at a pressure of about 165 psia to about 600 psia at a pressure of about 165 psia to about 600 psia at least a portion of the olefin vapor stream to an olefin recovery system, wherein the olefin vapor stream is not compressed during the cooling step and introducing step.
Dependencies are inferred from the claim text.