Exxon Research and Engineering Company

Brian Eric Henry

Shun Chong Fung

Tan-Jen Chen

William A Wachter

Marcel Johannes Janssen

John Ernest Asplin

A process for selectively producing C.sub.2 -C.sub.4 olefins from a catalytically cracked or thermally cracked naphtha stream is disclosed. A mixture of the naphtha stream and a stream of steam is feed into a reaction zone where it is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500 to 650.degree. C. and a hydrocarbon partial pressure from about 10 to 40 psia.

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Baton Rouge, LA, United States of America

Brian Eric Henry