| (19) |
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(11) |
EP 1 736 236 A8 |
| (12) |
CORRECTED EUROPEAN PATENT APPLICATION |
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published in accordance with Art. 158(3) EPC |
| (15) |
Correction information: |
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Corrected version no 1 (W1 A1) |
| (48) |
Corrigendum issued on: |
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04.04.2007 Bulletin 2007/14 |
| (43) |
Date of publication: |
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27.12.2006 Bulletin 2006/52 |
| (22) |
Date of filing: 26.07.2004 |
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| (51) |
International Patent Classification (IPC):
|
| (86) |
International application number: |
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PCT/JP2004/010615 |
| (87) |
International publication number: |
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WO 2006/011191 (02.02.2006 Gazette 2006/05) |
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| (84) |
Designated Contracting States: |
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AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
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| (71) |
Applicant: Kurita Water Industries Ltd. |
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Shinjuku-ku, Tokyo 160-8383 (JP) |
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| (72) |
Inventors: |
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- NAKANO, Tadashi,
c/o KURITA WATER INDUSTRIES LTD.
Shinjuku-ku, Tokyo 160-8383 (JP)
- KAWAKATSU, Takahiro
KURITA WATER INDUSTRIES LTD.
Shinjuku-ku, Tokyo 160-8383 (JP)
- KUWANO, Hiroaki,
c/o KURITA WATER INDUSTRIES LTD.
Shinjuku-ku, Tokyo 160-8383 (JP)
|
| (74) |
Representative: Albrecht, Thomas et al |
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Kraus & Weisert,
Thomas-Wimmer-Ring 15
80539 München
80539 München (DE) |
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| |
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| (54) |
ANION ADSORBENT, PROCESS FOR PRODUCING THE SAME AND METHOD OF WATER TREATMENT |
(57) An anion absorbent comprising sintered clay of porous structure and a rare earth
compound supported on the sintered clay. The anion absorbent is produced by a production
method of an anion absorbent comprising a mixing step of mixing clay with an additive
for making the clay porous, a sintering step of sintering a mixture obtained in the
mixing step, and a supporting step of supporting a rare earth compound on the clay
before the mixing step and/or on a sintered matter after the sintering step. A water
treatment method comprising a step of bringing the anion absorbent into contact with
water to be treated at a predetermined pH so as to absorb and thus remove anions in
the water to be treated, and a step of bringing the absorbent, which absorbed anions,
into contact with solution having pH, which is different from the aforementioned predetermined
pH, so as to desorb anions from the absorbent.