Title:
CHROMIUM(III) CARBONATE AND PROCESS FOR PRODUCTION OF SAME
Document Type and Number:
WIPO Patent Application WO/2010/026915
Kind Code:
A1
Abstract:
A chromium(III) carbonate which assumes a light blue color in a solid state. The chromium(III) carbonate exhibits an L* value of 50 to 70, an a* value of -4 to -2, and a b* value of -10 to -7, each value being defined in the L*a*b* color system (JIS Z8729). It is preferable that the chromium(III) carbonate is completely dissolved within 30 minutes when the chromium(III) carbonate in an amount corresponding to one gram of Cr is added at 25°C to one liter of an aqueous hydrochloric acid solution having a pH of 0.2. The chromium(III) carbonate is produced preferably by bringing an aqueous solution of a carbonic acid salt into contact with an aqueous solution containing trivalent chromium under such conditions that the reaction fluid temperature falls within the range of 0°C to lower than 50°C and at a pH of 6 to 12. It is preferable that after the formation of chromium(III) carbonate, the reaction mixture is filtered and washed with water until the electric conductivity of the filtrate falls to 5mS/cm or below.
Inventors:
KUWANO HIROYUKI (JP)
BANDA TOMOHIRO (JP)
TANAKA YASUYUKI (JP)
BANDA TOMOHIRO (JP)
TANAKA YASUYUKI (JP)
Application Number:
PCT/JP2009/064960
Publication Date:
March 11, 2010
Filing Date:
August 27, 2009
Export Citation:
Assignee:
NIPPON CHEMICAL IND (JP)
KUWANO HIROYUKI (JP)
BANDA TOMOHIRO (JP)
TANAKA YASUYUKI (JP)
KUWANO HIROYUKI (JP)
BANDA TOMOHIRO (JP)
TANAKA YASUYUKI (JP)
International Classes:
C01B32/60; C01G37/00; C25D21/14
Domestic Patent References:
| WO2008007497A1 | 2008-01-17 | |||
| WO2005056478A1 | 2005-06-23 |
Foreign References:
| JP2003286584A | 2003-10-10 | |||
| JPH07247121A | 1995-09-26 | |||
| JPH06306630A | 1994-11-01 | |||
| JPH0995793A | 1997-04-08 | |||
| JP2002322599A | 2002-11-08 | |||
| JP2006249518A | 2006-09-21 | |||
| JPS5235794A | 1977-03-18 | |||
| JPS53132499A | 1978-11-18 | |||
| JPH0292828A | 1990-04-03 |
Other References:
FUMIO NOGUCHI ET AL.: "Mekki Haieki kara no Yuka Kinzoku no Kaishu ni Tsuite -Tansan Chrom no Seisei Oyobi Netsu Bunkai Kiko", SHIGEN - SOZAI GAKKAI SHUNKI TAIKAI KOENSHU, vol. 2, 29 March 2001 (2001-03-29), pages 32 - 33, XP008143264
"Encyclopaedia Chimica", vol. 5, 1 June 1993, KYORITSU SHUPPAN CO., LTD., pages: 723
"Encyclopaedia Chimica", vol. 5, 1 June 1993, KYORITSU SHUPPAN CO., LTD., pages: 723
Attorney, Agent or Firm:
NIPPON CHEMICAL INDUSTRIAL CO., LTD. (JP)
Nippon Chemical Industrial Co., Ltd. (JP)
Nippon Chemical Industrial Co., Ltd. (JP)
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