Process for selectively producing propylene in a fluid catalytic cracking process

US6803494B1 · kind B1 · utility

Assignee

• ExxonMobil Chemical Patents Inc. · US

Inventors

• Paul K. Ladwig · Dover, US
• John E. Asplin · Houston, US
• Gordon F. Stuntz · Baton Rouge, US
• William A. Wachter · Baton Rouge, US
• Brian Erik Henry · Baton Rouge, US
• Shun C. Fung · Bound Brook, US

Key dates

• Filing date: May 19, 2000
• Grant date: Oct 12, 2004
• Expiry date: May 19, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G2400/20
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

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° C. to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia. The catalyst may be pre-coked with a carbonaceous feed. Alternatively, the carbonaceous feed used to coke the catalyst may be co-fed with the naphtha feed.