CH86379A - Process for the production of aluminum nitride. - Google Patents
Process for the production of aluminum nitride.Info
- Publication number
- CH86379A CH86379A CH86379DA CH86379A CH 86379 A CH86379 A CH 86379A CH 86379D A CH86379D A CH 86379DA CH 86379 A CH86379 A CH 86379A
- Authority
- CH
- Switzerland
- Prior art keywords
- mass
- briquettes
- aluminum nitride
- production
- gas
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/04—Pressure vessels, e.g. autoclaves
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/072—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with aluminium
- C01B21/0726—Preparation by carboreductive nitridation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
- F27D11/04—Ohmic resistance heating with direct passage of current through the material being heated
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/60—Heating arrangements wherein the heating current flows through granular powdered or fluid material, e.g. for salt-bath furnace, electrolytic heating
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Furnace Details (AREA)
- Ceramic Products (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Discharge Heating (AREA)
Description
Procédé pour la production de nitrure d'aluminium. L'invention concerne un procédé pour la production de nitrure d'aluminium, suivant lequel une distribution pratiquement uniforme d'un gaz contenant du nitrogène a lieu au travers d'une masse formée de briquettes, composées de charbon en particules menues, d'alumine et d'un agglomérant, ce mélange de gaz et de briquettes étant chauffé à une température suffisante pour assurer la réaction chimique entre le gaz et les briquettes pour produire le nitrure d'aluminium.
De préfé rence, la masse des briquettes et le gaz cir culent en sens contraire dans un conduit vertical et la chaleur nécessaire à la réaction est engendrée par ni) courant électrique tra versant radialement le conduit.
Il est montré au dessin ci-annexé, à titre d'exemple, un four pour la réalisation de ce procédé.
Ce four est chauffé électriquement; il pos sède un conduit central vertical 10, que les briquettes, qui peuvent être sphériques ou ovoïdes, traversent de haut en bas de ma nière continue et régulière, sous l'effet de la pesanteur. Du âaz sous pression contenant du nitrogène est amené par des tuyaux 12, 12, dans la partie inférieure dudit conduit et le traverse de bas en haut. Par le fait de la disposition verticale du conduit, le gaz est distribué de faon pratiquement uniforme au travers de la masse. Le four représenté comporte, en outre, une électrode verticale eu graphite 13 descendant au milieu du con duit dans lequel a lieu la réaction.
La masse des briquettes forme un cylindre creux au tour de cette électrode. L'électrode opposée 14 est en forme d'anneau et en graphite. De cette manière, la masse des briquettes en sa course descendante et les gaz en leur course ascendante passent entre les électrodes oû le tout est chauffé par le courant électrique passant d'une électrode à l'autre.
Le gaz froid, avant d'atteindre la zone dans laquelle à lieu la réaction, passe au travers de la matière solide chaude qui a traversé cette zone et entraîne sinon toute, du moins une partie de la chaleur contenue dans cette matière. D'autre part, les bri quettes au-dessus de la zone chaude sont chauffées par le gaz montant. De cette ma- nière les deux ingrédients froids qui entrent dans le conduit dans des directions opposées tendent avantageusement à restreindre et confiner la zone chaude.
Process for the production of aluminum nitride. The invention relates to a process for the production of aluminum nitride, in which a substantially uniform distribution of a nitrogen-containing gas takes place through a mass formed of briquettes, composed of fine particulate carbon, alumina. and a binder, this mixture of gas and briquettes being heated to a temperature sufficient to ensure the chemical reaction between the gas and the briquettes to produce aluminum nitride.
Preferably, the mass of the briquettes and the gas circulate in the opposite direction in a vertical pipe and the heat necessary for the reaction is generated by electric current flowing radially through the pipe.
It is shown in the accompanying drawing, by way of example, an oven for carrying out this process.
This oven is electrically heated; it has a vertical central duct 10, which the briquettes, which can be spherical or ovoid, pass through from top to bottom in a continuous and regular manner, under the effect of gravity. Pressurized az containing nitrogen is brought by pipes 12, 12, into the lower part of said duct and passes through it from bottom to top. By virtue of the vertical arrangement of the duct, the gas is distributed practically uniformly through the mass. The furnace shown further comprises a vertical graphite electrode 13 descending to the middle of the pipe in which the reaction takes place.
The mass of the briquettes forms a hollow cylinder around this electrode. The opposing electrode 14 is ring shaped and made of graphite. In this way, the mass of the briquettes in its downward stroke and the gases in their upward stroke pass between the electrodes where the whole is heated by the electric current passing from one electrode to the other.
The cold gas, before reaching the zone in which the reaction takes place, passes through the hot solid matter which has passed through this zone and entrains if not all, at least part of the heat contained in this matter. On the other hand, the bri quettes above the hot zone are heated by the rising gas. In this way the two cold ingredients which enter the conduit in opposite directions advantageously tend to restrict and confine the hot zone.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US86379XA | 1918-01-28 | 1918-01-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH86379A true CH86379A (en) | 1920-08-16 |
Family
ID=21732760
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH86379D CH86379A (en) | 1918-01-28 | 1919-03-11 | Process for the production of aluminum nitride. |
CH86474D CH86474A (en) | 1918-01-28 | 1919-03-11 | Electric oven. |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH86474D CH86474A (en) | 1918-01-28 | 1919-03-11 | Electric oven. |
Country Status (4)
Country | Link |
---|---|
CH (2) | CH86379A (en) |
DE (2) | DE342636C (en) |
FR (1) | FR497290A (en) |
GB (2) | GB122829A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1327707A (en) * | 1956-07-31 | 1963-05-24 | Pechiney Prod Chimiques Sa | Aluminum nitride manufacturing process |
ATE150426T1 (en) * | 1991-06-19 | 1997-04-15 | Atochem Elf Sa | CONTINUOUS PROCESS FOR PRODUCING ALUMINUM NITRIDE BY CARBONITRIDING ALUMINUM |
-
1919
- 1919-01-06 GB GB365/19A patent/GB122829A/en not_active Expired
- 1919-01-06 GB GB364/19A patent/GB122828A/en not_active Expired
- 1919-03-11 CH CH86379D patent/CH86379A/en unknown
- 1919-03-11 CH CH86474D patent/CH86474A/en unknown
- 1919-03-18 FR FR497290A patent/FR497290A/en not_active Expired
-
1920
- 1920-03-03 DE DE1920342636D patent/DE342636C/en not_active Expired
- 1920-03-04 DE DE1920349436D patent/DE349436C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB122828A (en) | 1919-12-31 |
DE342636C (en) | 1921-10-21 |
DE349436C (en) | 1922-03-02 |
FR497290A (en) | 1919-12-02 |
CH86474A (en) | 1920-09-01 |
GB122829A (en) | 1920-04-06 |
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