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Title:
PROCESS FOR PRODUCING CALCIUM HYDROGEN PHOSPHATE DIHYDRATE AND FLUORINE INSOLUBILIZER
Document Type and Number:
WIPO Patent Application WO/2011/064836
Kind Code:
A1
Abstract:
A process for producing calcium hydrogen phosphate dihydrate is provided by which it is possible to obtain calcium hydrogen phosphate dihydrate that has high particle-surface activity and is hence useful as a fluorine insolubilizer, etc., without necessitating any treatment. Also provided is a fluorine insolubilizer. A calcium salt was reacted with phosphoric acid and/or a phosphoric acid salt in an aqueous medium having a temperature of 70ºC or lower, and the pH of the resultant reaction mixture was regulated to 5.50-7.50.

Inventors:
TAFU MASAMOTO (JP)
CHOHJI TETSUJI (JP)
FUJITA TAKUMI (JP)
NAKANO HIROKAZU (JP)
MORIOKA ICHIRO (JP)
MORI KATSUMI (JP)
HIWASA MASAYA (JP)
MAEDA MAKOTO (JP)
TAKENAKA KAZUMASA (JP)
Application Number:
PCT/JP2009/069783
Publication Date:
June 03, 2011
Filing Date:
November 24, 2009
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Assignee:
INST NAT COLLEGES TECH JAPAN (JP)
CHIYODA UTE CO LTD (JP)
TAFU MASAMOTO (JP)
CHOHJI TETSUJI (JP)
FUJITA TAKUMI (JP)
NAKANO HIROKAZU (JP)
MORIOKA ICHIRO (JP)
MORI KATSUMI (JP)
HIWASA MASAYA (JP)
MAEDA MAKOTO (JP)
TAKENAKA KAZUMASA (JP)
International Classes:
C01B25/32; C01F11/00
Foreign References:
JPH06191808A1994-07-12
JPS63215505A1988-09-08
JP2007216156A2007-08-30
JPH0710511A1995-01-13
Attorney, Agent or Firm:
IRIYAMA Hiromasa (JP)
Hiromasa Iriyama (JP)
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