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1. WO1992016457 - MOVING BED PROCESS FOR CARBOTHERMALLY SYNTHESIZING NONOXIDE CERAMIC POWDERS

Publication Number WO/1992/016457
Publication Date 01.10.1992
International Application No. PCT/US1992/001482
International Filing Date 27.02.1992
Chapter 2 Demand Filed 15.10.1992
IPC
B01J 8/08 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
8Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
08with moving particles
C01B 21/06 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
21Nitrogen; Compounds thereof
06Binary compounds of nitrogen with metals, with silicon, or with boron
C01B 21/068 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
21Nitrogen; Compounds thereof
06Binary compounds of nitrogen with metals, with silicon, or with boron
068with silicon
C01B 21/072 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
21Nitrogen; Compounds thereof
06Binary compounds of nitrogen with metals, with silicon, or with boron
072with aluminium
C01B 21/076 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
21Nitrogen; Compounds thereof
06Binary compounds of nitrogen with metals, with silicon, or with boron
076with titanium or zirconium
C01B 31/30 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
31Carbon; Compounds thereof
30Carbides
CPC
B01J 8/087
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
8Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
08with moving particles
087Heating or cooling the reactor
C01B 21/06
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
21Nitrogen; Compounds thereof
06Binary 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
C01B 21/0617
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
21Nitrogen; Compounds thereof
06Binary 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
0615with transition metals other than titanium, zirconium or hafnium
0617with vanadium, niobium or tantalum
C01B 21/062
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
21Nitrogen; Compounds thereof
06Binary 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
0615with transition metals other than titanium, zirconium or hafnium
062with chromium, molybdenum or tungsten
C01B 21/0685
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
21Nitrogen; Compounds thereof
06Binary 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
068with silicon
0685Preparation by carboreductive nitridation
C01B 21/0726
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
21Nitrogen; Compounds thereof
06Binary 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
072with aluminium
0726Preparation by carboreductive nitridation
Applicants
  • THE DOW CHEMICAL COMPANY [US]/[US]
Inventors
  • HENLEY, John, P.
  • DUNN, David, A.
  • EISMAN, Glenn, A.
  • ADEGBITE, Valerie, O.
Agents
  • HOWARD, Dan, R.
Priority Data
673,62422.03.1991US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MOVING BED PROCESS FOR CARBOTHERMALLY SYNTHESIZING NONOXIDE CERAMIC POWDERS
(FR) PROCEDE A LIT FLUIDISE POUR EFFECTUER LA SYNTHESE CARBOTHERMIQUE DE POUDRES DE CERAMIQUE NON OXIDEE
Abstract
(EN)
Carbothermally reduce a metal oxide to its corresponding metal nitride or metal carbide powder in a vertical gravity flow reactor (11) by adding precursor pellets containing the metal oxide, a thermally decomposed binder material, and carbon or a source of carbon, directly to a heated reaction zone (31) within the reactor. The pellets form a pellet bed (19). The top of the bed (18) must be maintained within the heated reaction zone. The binder material is a blend of wheat and corn starches. The binder material thermally decomposes to a carbonaceous residue that functions both as an additional source of carbon and as a binder for the precursor pellets.
(FR)
On obtient la réduction carbothermique d'un oxyde de métal en son nitrure de métal ou en son carbure de métal correspondant sous forme pulvérulente, dans un réacteur (11) vertical à flux par gravité, en ajoutant un précurseur sous forme de granules contenant l'oxyde de métal, une matière liante décomposée thermiquement, et du carbone ou une source de carbone, directement dans une zone (31) de réaction chauffée à l'intérieur du réacteur. Les granules forment un lit (19) de granules. Le sommet (18) du lit doit être maintenu dans la zone de réaction chauffée. La matière liante est constituée par un mélange d'amidons de blé et de maïs. La matière liante se décompose thermiquement en un résidu charbonneux qui sert à la fois de source additionnelle de carbone et de liant pour le précurseur sous forme de granules.
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