Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1987-07-22
1988-05-17
Sneed, Helen M. S.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423237, 208113, 208155, 502 41, 502 43, 502 49, 502 50, 502 52, 502 54, 55 68, 55 70, C01B 2120
Patent
active
047449624
ABSTRACT:
A regeneration zone for fluid catalytic cracking contains ammonia (NH.sub.3) when the regeneration zone is operated in a partial combustion mode as defined by a content of CO of between 1 and 6 percent by volume. If the ammonia is not removed from the regeneration zone off gass, the same will be passed to a CO combustion zone where, in the presence of oxygen, CO is oxidized to CO.sub.2 and some of the ammonia will undesirably be oxidized to NO.sub.x. This invention reduces the presence of ammonia in the feed gas to a CO combustion zone of an FCC process by the introduction of a NO.sub.x -containing gas to dilute phase of a regeneration zone or to a regeneration zone off gas. Ammonia, NO.sub.x and oxygen present in the regeneration zone off gas of the regeneration zone, will tend to react to produce nitrogen and water vapor, which then is passed to the CO combustion zone for CO oxidation to CO.sub.2. Where the addition of NO.sub.x is made at temperatures greater than 1700.degree. F., hydroxyl precursor addition may not be required. Where addition is made at temperatures lower than 1700.degree. F. a hydroxyl precursor may be added to the gas admixtures.
REFERENCES:
patent: 3058906 (1962-10-01), Stine et al.
patent: 4002723 (1977-01-01), Inaba et al.
patent: 4081508 (1978-03-01), Luckenbach
patent: 4104361 (1978-08-01), Nishikawa et al.
patent: 4115250 (1978-09-01), Flanders et al.
patent: 4115251 (1978-09-01), Flanders et al.
patent: 4153535 (1979-05-01), Vasalos et al.
patent: 4164546 (1979-08-01), Welty, Jr. et al.
patent: 4181705 (1980-01-01), Gumerman
patent: 4204944 (1980-05-01), Flanders et al.
patent: 4204945 (1980-05-01), Flanders et al.
patent: 4221677 (1980-09-01), Vasalos et al.
patent: 4238371 (1980-12-01), Finch
patent: 4251388 (1981-02-01), Takahashi et al.
patent: 4259175 (1981-03-01), McArthur
patent: 4290878 (1981-09-01), Blanton, Jr.
patent: 4335084 (1982-06-01), Brogan
patent: 4351811 (1982-09-01), Matsuda et al.
patent: 4368057 (1983-01-01), Matthews
patent: 4423017 (1983-12-01), Dean
patent: 4434147 (1984-02-01), Dimpfl et al.
patent: 4435281 (1984-03-01), Vasalos
patent: 4435282 (1984-03-01), Bertolacini et al.
patent: 4469662 (1984-09-01), Hamada et al.
patent: 4521389 (1985-06-01), Blanton et al.
patent: 4551231 (1985-11-01), Kovach et al.
patent: 4624840 (1986-11-01), Dean et al.
Abstract 78465B/43 J7, 9030-318.
Altrichter Diana M.
Johnson Gregory L.
Samish Norman C.
McFarlane Anthony
Muller Kimbley L.
Shell Oil Company
Sneed Helen M. S.
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