Exxonmobil Research and Engineering Company

Exxonmobil Chemical Patents Inc.

B Erik Henry

William A Wachter

John E Asplin

Gordon Frederick Stuntz

George A Swan, Iii

Paul K Ladwig

Shun Chong Fung

Tan-Jen Chen

Marcel Johannes Janssen

Michael Walter Bedell

The propylene production of a fluid catalytic cracking unit employing a large pore zeolite cracking catalyst, produces more propylene by adding a naphtha cracking riser and a medium pore zeolite catalytic component to the unit, and recycling at least a portion of the naphtha crackate to the naphtha riser. The large pore size zeolite preferably comprises a USY zeolite and the medium pore size is preferably ZSM-5. Propylene production per unit of naphtha feed to the naphtha riser is maximized, by using the 60&#x2013;300&#xb0; F. naphtha crackate as the feed.

Fluid cat cracking with high olefins production

A process for producing polypropylene from olefins selectively produced from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream 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&deg; C. to 650&deg; C. and a hydrocarbon partial pressure from about 10 to 40 psia.

Process for producing polypropylene from C3 olefins selectively produced in a fluid catalytic cracking process

A process for producing polymers from olefins selectively produced by a two stage process for selectively producing C,to C,olefins from a gas oil or resid is disclosed herein. The gas oil or resid is reacted in a first stage comprising a fluid catalytic cracking unit wherein it is converted in the presence of conventional large pore zeolitic catalyst to reaction products, including a naphtha boiling range stream. The naphtha boiling range stream is introduced into a second stage comprising a process unit containing a reaction zone, a stripping zone, a catalyst regeneration zone, and a fractionation zone. The naphtha feed is contacted in the reaction zone 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 ranging from about 500 to 650&deg; C. and a hydrocarbon partial pressure from about 10 to 40 psia. Vapor products are collected overhead and the catalyst particles are passed through the stripping zone on the way to the catalyst regeneration zone. Volatiles are stripped with steam in the stripping zone and the catalyst particles are sent to the catalyst regeneration zone where coke is burned from the catalyst, which is then recycled to the reaction zone.

Process for producing polypropylene from C3 olefins selectively produced by a two stage fluid catalytic cracking process

A process for producing polymers from C,-C,olefins selectively produced from a catalytically-cracked or thermally-cracked naphtha stream is disclosed herein. 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 that include temperatures from about 500&deg; C. to 650&deg; C. and a hydrocarbon partial pressure from about 10 to 40 psia.

Process for producing polypropylene from C3 olefins selectively produced in a fluid catalytic cracking process from a naphtha/steam feed

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Katy, TX, United States of America

B Erik Henry