Chemistry of hydrocarbon compounds – Unsaturated compound synthesis – By c content reduction – e.g. – cracking – etc.
Patent
1998-05-05
2000-07-25
Griffin, Walter D.
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
By c content reduction, e.g., cracking, etc.
208118, 20812001, 208122, 585651, 585654, C07C 406
Patent
active
060938676
ABSTRACT:
A process for selectively producing C.sub.3 olefins from a catalytically cracked or thermally cracked naphtha stream. 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.degree. to 650.degree. 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. Overhead products from the reaction zone are passed to a fractionation zone where a stream of C.sub.3 's is recovered and a stream rich in C.sub.4 and/or C.sub.5 olefins is recycled to the stripping zone.
REFERENCES:
patent: 3812029 (1974-05-01), Snyder
patent: 3928172 (1975-12-01), Davis, Jr. et al.
patent: 4251348 (1981-02-01), O'Rear et al.
patent: 4282085 (1981-08-01), O'Rear et al.
patent: 4324688 (1982-04-01), Castagnos, Jr. et al.
patent: 4370222 (1983-01-01), McGovern et al.
patent: 4385985 (1983-05-01), Gross et al.
patent: 4830728 (1989-05-01), Herbst et al.
patent: 4863585 (1989-09-01), Herbst et al.
patent: 4892643 (1990-01-01), Herbst et al.
patent: 4918256 (1990-04-01), Nemet-Mavrodin
patent: 4980053 (1990-12-01), Li et al.
patent: 5026935 (1991-06-01), Leyshon et al.
patent: 5026936 (1991-06-01), Leyshon et al.
patent: 5043522 (1991-08-01), Leyshon et al.
patent: 5055176 (1991-10-01), Herbst et al.
patent: 5059735 (1991-10-01), Nemet-Mavrodin et al.
patent: 5171921 (1992-12-01), Gaffney et al.
patent: 5286370 (1994-02-01), Chu et al.
patent: 5348642 (1994-09-01), Serrand et al.
patent: 5389232 (1995-02-01), Adewuyi et al.
patent: 5472594 (1995-12-01), Tsang et al.
patent: 5549813 (1996-08-01), Dai et al.
patent: 5670037 (1997-09-01), Zaiting et al.
patent: 5723040 (1998-03-01), Lezsch et al.
patent: 5846402 (1998-12-01), Mandal et al.
patent: 5846403 (1998-12-01), Swan et al.
Asplin John Ernest
Chen Tan-Jen
Ladwig Paul K.
Stuntz Gordon F.
Exxon Research and Engineering Company
Griffin Walter D.
Naylor Henry E.
Preisch Nadine
LandOfFree
Process for selectively producing C3 olefins in a fluid catalyti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for selectively producing C3 olefins in a fluid catalyti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for selectively producing C3 olefins in a fluid catalyti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1337776