Title:
METHOD OF PURIFYING AQUEOUS ALKALI SOLUTION
Document Type and Number:
WIPO Patent Application WO/2007/148552
Kind Code:
A1
Abstract:
A method of purifying an aqueous alkali solution. By the method, a metal impurity
contained in an aqueous alkali solution having a relatively high concentration
can be rapidly removed in a simple manner. The method for purifying an aqueous
alkali solution comprises bringing an aqueous alkali solution containing a
metal impurity into contact with at least one material selected among a strongly
basic anion exchanger, weakly basic anion exchanger, and chelating material
each in a fibrous or bead form and activated carbon which has undergone activation
and subsequent contact with nitric acid.
Inventors:
YONEHARA TAKAHIRO (JP)
IIYAMA MASAMITSU (JP)
MAEDA YUUSUKE (JP)
ABE MITSUGU (JP)
IIYAMA MASAMITSU (JP)
MAEDA YUUSUKE (JP)
ABE MITSUGU (JP)
Application Number:
PCT/JP2007/061710
Publication Date:
December 27, 2007
Filing Date:
June 11, 2007
Export Citation:
Assignee:
NOMURA MICRO SCIENCE KK (JP)
YONEHARA TAKAHIRO (JP)
IIYAMA MASAMITSU (JP)
MAEDA YUUSUKE (JP)
ABE MITSUGU (JP)
YONEHARA TAKAHIRO (JP)
IIYAMA MASAMITSU (JP)
MAEDA YUUSUKE (JP)
ABE MITSUGU (JP)
International Classes:
C01D1/32; C01C1/02; C01D7/26; C02F1/28; C02F1/42
Domestic Patent References:
| WO2006018985A1 | 2006-02-23 |
Foreign References:
| JPS6427648A | 1989-01-30 | |||
| JPS52149297A | 1977-12-12 |
Attorney, Agent or Firm:
SUYAMA, Saichi (1 Kandata-cho 2-chome, Chiyoda-ku Tokyo 46, JP)
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