Abstract: The invention is related to a catalyst and a process for selectively producing light (i.e., C2-C4) olefins from a catalytically cracked or thermally cracked naphtha stream. 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. The catalysts do not require steam activation.
Abstract: A process for producing polymers from olefins selectively produced from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is introduced into a process unit comprised of a reaction zone, a stripping zone, a catalyst regeneration zone, and a fractionation zone. The naphtha feedstream 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° 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.
Type:
Grant
Filed:
March 2, 2000
Date of Patent:
May 14, 2002
Assignee:
ExxonMobil Chemical Patents Inc.
Inventors:
Paul K. Ladwig, John E. Asplin, Gordon F. Stuntz, Tan-Jen Chen
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.
Type:
Grant
Filed:
March 2, 2000
Date of Patent:
January 15, 2002
Assignee:
ExxonMobil Chemical Patents, Inc.
Inventors:
Paul K. Ladwig, John E. Asplin, Gordon F. Stuntz, William A. Wachter, B. Erik Henry
Abstract: The present invention is directed towards compositions of two or more zeolite layers. The compositions of the invention include zeolite compositions that are themselves catalytic as well as zeolite compositions used in combination with non-zeolite catalytic materials. The compositions may include a porous support.
Type:
Grant
Filed:
July 2, 1998
Date of Patent:
March 14, 2000
Assignee:
Exxon Research and Engineering Co.
Inventors:
Wenyih F. Lai, Edward William Corcoran, Jr.