Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1991-01-30
1991-10-22
McFarlane, Anthony
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208150, 208151, 208159, 208160, 208164, 585324, 585661, 502 41, C10G 1118
Patent
active
050593056
ABSTRACT:
Operational flexibility of a fluid catalytic cracking process is improved by directly cooling regenerated catalyst in an external catalyst cooler/stripper (ECCS). Regenerated catalyst withdrawn from the catalytic cracking unit regenerator is mixed with spent catalyst from the reactor stripper to effect desorption of cracked products from the spent catalyst at elevated temperature. The catalyst mixture is then contacted with an alkane-containing feedstream in a fluid bed maintained within a central section of the external catalyst cooler/stripper (ECCS). The mixture of spent and regenerated catalyst, cooled by the endothermic dehydrogenation of the alkanes, then flows downward through the ECCS to a lower section of the ECCS where the catalyst is countercurrently stripped with steam to remove remaining entrained hydrocarbons. Steam is withdrawn from an upper section of the steam stripping zone and bypassed around the dehydrogenation/stripping and mixing stages to avoid steam deactivation of the catalyst. The cooled, stripped catalyst mixture is then charged to the regenerator for further processing.
REFERENCES:
patent: 2377935 (1945-06-01), Gunness
patent: 2386491 (1945-10-01), McOmle
patent: 2397352 (1946-03-01), Hemminger
patent: 2492948 (1950-01-01), Berger
patent: 2662050 (1953-12-01), Moorman et al.
patent: 3008896 (1961-11-01), Lawson
patent: 3392110 (1968-07-01), Payne
patent: 4043899 (1977-08-01), Anderson et al.
patent: 4070159 (1978-01-01), Myers et al.
patent: 4374750 (1983-02-01), Vickers et al.
patent: 4404095 (1983-09-01), Haddad et al.
patent: 4422925 (1983-12-01), Williams et al.
patent: 4502947 (1985-03-01), Haddad et al.
patent: 4574044 (1986-03-01), Krug
patent: 4579716 (1986-04-01), Krambeck et al.
patent: 4581205 (1986-04-01), Schatz
patent: 4588558 (1986-05-01), Kam et al.
patent: 4606814 (1986-08-01), Haddad et al.
patent: 4623446 (1986-11-01), Haddad et al.
patent: 4624772 (1986-11-01), Krambeck et al.
patent: 4654060 (1987-03-01), Haddad et al.
patent: 4693809 (1987-09-01), Bartholic et al.
patent: 4724065 (1988-02-01), Bartholic et al.
patent: 4737346 (1988-04-01), Haddad et al.
patent: 4749471 (1988-06-01), Kam et al.
patent: 4789458 (1988-12-01), Haddad et al.
patent: 4812430 (1989-03-01), Child
patent: 4814068 (1989-03-01), Herbst et al.
patent: 4840928 (1989-06-01), Harandi et al.
patent: 4851374 (1989-07-01), Yan et al.
patent: 4853187 (1989-08-01), Herbst et al.
patent: 4917790 (1990-04-01), Owen
P. B. Venuto et al., Fluid Catalystic Cracking with Zeolite Catalysts, Marcel Dekker, N.Y., 1978.
Furr Jr. Robert B.
McFarlane Anthony
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
LandOfFree
Multistage FCC catalyst stripping does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multistage FCC catalyst stripping, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multistage FCC catalyst stripping will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-106386