Moving bed process for carbothermally synthesizing nonoxide cera

Details Moving bed process for carbothermally synthesizing nonoxide cera Moving bed process for carbothermally synthesizing nonoxide cera

1994-08-24

1997-03-04

Bennett, Henry A.

Heating

Shaft type

Having combustion products generated in or fed to shaft

432 95, 432100, 432178, 432200, F27D 108

Patent

active

056072970

ABSTRACT:
Carbothermally reduce a metal oxide to its corresponding metal nitride or metal carbide powder in a vertical gravity flow reactor 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 within the reactor. The pellets form a pellet bed, the top of which must be maintained within the heated reaction zone. The binder material is a blend of wheat and corn starches, optionally in conjunction with another binder such as melamine. The binder material thermally decomposes to a carbonaceous residue which functions both as an additional source of carbon and as a binder for the precursor pellets. The reactor may be modified by adding an internal vent line to remove volatile materials from the heated reaction zone before they have an opportunity to condense on internal reactor surfaces.

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S. Ergun, "Fluid Flow Through Packed Columns,"Chemical Engineering Progress, Feb. 1952, vol. 48, No. 2, pp. 89-94.

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