Chemistry of inorganic compounds – Nitrogen or compound thereof
Patent
1997-07-23
2000-08-29
Tran, Hien
Chemistry of inorganic compounds
Nitrogen or compound thereof
422139, 422143, 422231, 558319, B01J 822, C01B 2100, C07C25324
Patent
active
06110440&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fluidized-bed reactor for ammo-oxidation or oxidation, and an ammo-oxidation or oxidation process using the same.
BACKGROUND ART
Ammo-oxidation or oxidation has been carried out industrially for a long time, and a large number of fluidized-bed reactors used therefor have been proposed. The structure of a sparger for supplying and dispersing a raw material therefor, however, has been only disclosed in British Patent No. 1,265,770, JP-A-2-258, JP-A-6-211768, etc. (The term "JP-A" used herein means an unexamined published Japanese patent application.)
The former two, British Patent No. 1,265,770 and JP-A-2-258, are designed so that oxygen gas outlet orifices and propylene/ammonia outlet orifices are made to be opposite to each other, i.e., one oxygen gas outlet orifice directly faces one propylene/ammonia outlet orifice with both orifices aligning on the same axis, but there is no recognition concerning the hole size of the orifices. The latter, JP-A-6-211768, relates to a method of keeping the temperature of ammonia in conduit pipes to be not higher than the dissociation point thereof in order to prevent the nitrization of the supply conduit pipes. Specifically, the latter proposes to provide a protective layer of a heat insulating material in each of the conduit pipes, but there is no recognition concerning the hole size of orifices as similar to the former two.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a fluidized-bed reactor in which the yield of reaction is improved by controlling the molar ratio distribution of reaction gases locally arranged in the reactor in the ammo-oxidation or oxidation reaction, particularly, in the case where the reaction gases are separately supplied through two systems.
Another object of the present invention is to provide an ammo-oxidation or oxidation process using the above reactor.
Other objects and effects of the present invention will be apparent from the following description.
The present invention relates to a fluidized-bed reactor for ammo-oxidation or oxidation comprising a vessel, a sparger for supplying and dispersing a gas containing an organic material, and a distributor for supplying and dispersing an oxygen-containing gas, the sparger comprising a header and a plurality of dispersion pipes connected laterally to the header, the dispersion pipes each having a plurality of orifices, the hole size of an orifice nearest the header, and the hole size of one orifice is larger than or equal to the hole size of adjacent orifice that is nearer the header than the one orifice.
The present invention also relates to an ammo-oxidation or oxidation process comprising the step of ammo-oxidizing or oxidizing an organic material in the above fluidized-bed reactor.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view showing an example of a sparger of a fluidized-bed reactor according to the present invention.
FIG. 2 is a schematic sectional view of an orifice taken along the line A--A of FIG. 1.
FIG. 3 is a schematic vertical sectional view of an example of a fluidized-bed reactor which is a subject of the present invention.
FIG. 4 is a schematic vertical sectional view of another example of a fluidized-bed reactor which is a subject of the present invention.
BEST MODE FOR PRACTICING THE INVENTION
The ammo-oxidation or oxidation to be applied to the present invention is not particularly limited. Examples of the ammo-oxidation or oxidation include ammo-oxidation by which propylene, butene or propane is made to react with ammonia and oxygen to thereby produce corresponding nitrile; oxidation by which propylene, butene or propane is made to react with oxygen to thereby produce oxide; oxidation such as chloro-oxidation reaction; and the like reactions. The fluidized-bed reactor according to the present invention is aimed at an industrially practical apparatus.
The fluidized-bed reactor of the present invention will be described below by referring to the attached drawings, but t
REFERENCES:
patent: 4580597 (1986-04-01), Cordingley et al.
patent: 5256810 (1993-10-01), Rowe et al.
Ohta Masanobu
Yokura Morihide
Asahi Kasei Kogyo Kabushiki Kaisha
Tran Hien
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