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1. (WO2003072504) PURIFICATION METHOD FOR PRODUCING HIGH PURITY NIOBIUM COMPOUND AND/OR TANTALUM COMPOUND
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2003/072504    International Application No.:    PCT/JP2003/002225
Publication Date: 04.09.2003 International Filing Date: 27.02.2003
Chapter 2 Demand Filed:    26.06.2003    
IPC:
C01G 33/00 (2006.01), C01G 35/00 (2006.01), C22B 3/26 (2006.01), C22B 34/24 (2006.01)
Applicants: STELLA CHEMIFA KABUSHIKI KAISHA [JP/JP]; 6-3, Awajimachi 3-chome, Chuo-ku, Osaka-shi, Osaka 541-0047 (JP) (For All Designated States Except US).
KIKUYAMA, Hirohisa [JP/JP]; (JP) (For US Only).
WAKI, Masahide [JP/JP]; (JP) (For US Only).
IZUMI, Hirohito [JP/JP]; (JP) (For US Only).
YAZAKI, Hirofumi [JP/JP]; (JP) (For US Only).
AOKI, Kenji [JP/JP]; (JP) (For US Only).
HASHIGUCHI, Shinji [JP/JP]; (JP) (For US Only).
KAWAWAKI, Rie [JP/JP]; (JP) (For US Only).
MURAKAMI, Yuko [JP/JP]; (JP) (For US Only)
Inventors: KIKUYAMA, Hirohisa; (JP).
WAKI, Masahide; (JP).
IZUMI, Hirohito; (JP).
YAZAKI, Hirofumi; (JP).
AOKI, Kenji; (JP).
HASHIGUCHI, Shinji; (JP).
KAWAWAKI, Rie; (JP).
MURAKAMI, Yuko; (JP)
Agent: FUKUMORI, Hisao; 2F, Fuji Building, 5-11, Kudanminami 4-chome, Chiyoda-ku, Tokyo 102-0074 (JP)
Priority Data:
2002/52412 27.02.2002 JP
Title (EN) PURIFICATION METHOD FOR PRODUCING HIGH PURITY NIOBIUM COMPOUND AND/OR TANTALUM COMPOUND
(FR) PROCEDE DE PURIFICATION SERVANT A PRODUIRE UN COMPOSE DE NIOBIUM ET/OU DE TANTALE DE GRANDE PURETE
Abstract: front page image
(EN)A purification method for producing a high purity niobium compound and/or tantalum compound, characterized in that it comprises adding an organic compound to an aqueous solution having, dissolved therein, a niobium compound and/or tantalum compound containing impurities, and then subjecting the resulting mixture to an extraction treatment. The above aqueous solution is preferably prepared by using crystals obtained by the crystallization of a solution containing a niobium compound and/or a tantalum compound. The purification method allows the purification of a niobium compound and/or a tantalum compound to a high purity product with an easier and simpler procedure at a reduced cost.
(FR)L'invention concerne un procédé de purification qui permet d'obtenir un composé de niobium et/ou un composé de tantale de grande pureté. Ce procédé consiste d'abord à ajouter un composé organique à une solution aqueuse dans laquelle est dissous un composé de niobium ou de tantale contenant des impuretés, et à soumettre ensuite le mélange résultant à une opération d'extraction. La solution aqueuse précitée est préférablement préparée à l'aide de cristaux obtenus par la cristallisation d'une solution à base de niobium et/ou de tantale. Le procédé de purification permet de purifier un composé de niobium et/ou de tantale pour obtenir, à un coût réduit, un produit de grande pureté de manière plus simple et plus facile.
Designated States: BR, CN, JP, KR, US.
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IT, LU, MC, NL, PT, SE, SI, SK, TR).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)