Process for preparing metal carbides and precursors thereof
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsYukihiro Yoda, Makoto Horita, Kensaku Maruyama, Hideaki Miyashita, Norihiro Murakawa, Kazuyoshi Isogaya, Fumio Nakamura, Norimasa Kawamura, Noriaki Kuramitsu
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Abstract
A carbon-containing mixture is obtained by collecting a dispersed phase mixture from an aerosol which has been formed by introducing a decomposable carbon compound and a decomposable metallic compound into a hot gas containing steam. Since this carbon-containing mixture is extremely high in uniformity and consists of extremely fine particles, it can afford after heat treatment a metal carbide of high quality.
Claims8
A process for preparing a carbon-containing mixture comprising elemental carbon and at least a metal oxide having the molar ratio of carbon to metal in the range of 3 to 20 suitable for the preparation of a metal carbide which comprises:
- (i) introducing a decomposable carbon compound which compound is a metal-free carbon compound capable of being decomposed to elemental carbon in a hot gas and a decomposable metallic compound which compound is a metallic compound capable of being decomposed in a hot gas containing steam to produce a corresponding metal oxide, into a hot gas containing steam, said carbon compound and said metallic compound being present in an amount sufficient to obtain said carbon to metal molar ratio of 3 to 20,
- (ii) decomposing said carbon compound to elemental carbon and said metallic compound to a metallic oxide by said hot gas in the presence of said steam,
- (iii) thereby producing said solid mixture of elemental carbon and a metal oxide dispersed in a gas phase,
- (iv) collecting said dispersed solid mixture from said gas phase by solid-gas separating means.
A process for preparing a metal carbide from a carbon-containing mixture comprising elemental carbon and at least a metal oxide having the molar ratio of carbon to metal in the range of 3 to 20 suitable for the preparation of a metal carbide which comprises:
- (i) introducing a decomposable carbon compound which compound is a metal free carbon compound capable of being decomposed to elemental carbon in a hot gas and a decomposable metallic compound which compound is a metallic compound capable of being decomposed in a hot gas containing steam to produce a corresponding metal oxide into a hot gas containing steam, said carbon compound and said metallic compound being present in an amount sufficient to obtain said carbon to metal molar ratio of 3 to 20.
- (ii) decomposing said carbon compound to elemental carbon and said metallic compound to a metallic oxide by said hot gas in the presence of said steam,
- (iii) thereby producing said solid mixture of elemental carbon and metal oxide dispersed in a gas phase,
- (iv) collecting said dispersed solid mixture from said gas phase by solid-gas separating means,
- (v) heating said carbon containing mixture in a furnace at a temperature in the range from about 1,300.degree. C. to about 2,400.degree. C. to convert said carbon-containing mixture to a metal carbide.
Dependencies are inferred from the claim text.