| (19) |
 |
|
(11) |
EP 0 259 115 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
18.01.1989 Bulletin 1989/03 |
| (43) |
Date of publication A2: |
|
09.03.1988 Bulletin 1988/10 |
| (22) |
Date of filing: 28.08.1987 |
|
| (51) |
International Patent Classification (IPC)4: C10G 11/18 |
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB IT NL |
| (30) |
Priority: |
03.09.1986 US 903344
|
| (71) |
Applicant: MOBIL OIL CORPORATION |
|
New York
New York 10017 (US) |
|
| (72) |
Inventors: |
|
- Herbst, Joseph Anthony
Turnersville
New Jersey 08012 (US)
- Owen, Hartley
Belle Mead
New Jersey 08502 (US)
- Schipper, Paul Herbert
Wilmington
Delaware 19810 (US)
|
| (74) |
Representative: Colmer, Stephen Gary |
|
Mobil Services Company Limited,
Office of Legal Counsel,
European IP Group,
Mobil Court,
3 Clements Inn
London WC2A 2EB
London WC2A 2EB (GB) |
|
| |
|
| (54) |
Process and apparatus to reduce NOx emissions from a fluid catalytic cracking unit |
(57) A multistage process for reducing NO
x in flue gas from fluid catalytic cracking catalyst regeneration. Flue gas is preferably
removed after each stage. NO
x formed in each regeneration stage is converted to N₂ prior to discharge from a stage
by operating at least the downstream ends of each regeneration stage at oxygen-lean
conditins. Staged regeneration can be achieved by passing spent catalyst through a
transport reactor in plug type flow and sequentially contacting the catalyst with
a plurality of oxygen-containing streams.