Exxon Research and Engineering Company

Exxonmobil Chemical Patents Inc.

Albert Y Hu

Vijay Swarup

Charles Morris Yarbrough

Michael Walter Bedell

Patrick Joseph Maher

This invention relates to a method of making an olefin from a dialkyl ether comprising (a) introducing an ether having a formula CHCHinto a thermal or catalytic cracking unit processing a hydrocarbon feedstock; and (b) decomposing at least a portion of the ether to form an olefin having a formula CHand/or CHand an alcohol having a formula CHand/or CHOH, wherein x and y independently range from about 1 to about 30. This invention also relates to a method of reducing coking in a thermal or catalytic cracking unit comprising (a) introducing an ether, having a formula CHOCH, into the cracking unit processing a hydrocarbon feedstock in an amount effective to reduce coke formation relative to processing the hydrocarbon feedstock in the absence of the ether, wherein x and y independently range from about 1 to about 30.

Method for decomposition of ethers

Spent FCC catalyst is regenerated under net reducing conditions in a regenerator to minimize the migration of vanadium on the spent FCC catalyst particles. Reducing conditions in at least the bottom 50% of the catalyst bed are maintained by using at least two air distribution grids located in the lower 50% of the catalyst bed.

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Baton Rouge, LA, United States of America

Albert Y Hu