Hoya Corporation

Other

Tomohiko Yoshitake

Tsuyoshi Ishikawa

Yoshiyuki Ogawara

Shintaro Kobayashi

Yukiko Murakami

Tsuneo Okuyama

Yukiki Murakami

Naomi Masuzawa

A method of producing fluoroapatite powder by using a calcium compound, a phosphate compound, and a fluorine compound as a raw material is provided. The method comprises: preparing a slurry containing fluoroapatite produced from the raw material by using a wet process; applying an ultrasonic wave to the slurry; and drying the slurry to obtain the fluoroapatite powder mainly constituted of the fluoroapatite. The method provides fluoroapatite powder having improved particle strength. Further, an adsorption apparatus including the fluoroapatite powder is also provided.

Method of producing fluoroapatite powder, fluoroapatite powder, and adsorption apparatus

A method of producing fluoroapatite by using a calcium-based compound containing calcium, hydrogen fluoride and phosphoric acid is provided. The method can be produced fluoroapatite having improved acid resistance by reducing an amount of an impurity derived from a raw material to a low or very low level, and ability capable of separating a large amount of a protein due to a large specific surface area thereof. Further, fluoroapatite having high acid resistance and a large specific surface area is also provided. Furthermore, an adsorption apparatus using such fluoroapatite is also provided.

Method of producing fluoroapatite, fluoroapatite, and adsorption apparatus

An adsorption apparatus comprising a column filled with an adsorbent, wherein the surface of the adsorbent and its vicinity mainly comprise an apatite which is represented by the formula (CaM)(PO)((OH)X), where the M represents at least one kind of rare earth metal elements, the X represents at least one kind of halogen elements, 0&#x3c;a&#x2266;1, and 0&#x2266;b&#x2266;1. Preferably, the M comprises a lanthanide-based metal element mainly comprising Sm, and the ratio of Sm is no less than 70% to the total amount of the M. The adsorbent apparatus may be manufactured by passing a solution containing ions of at least one kind of rare earth metal elements through the adsorbent filling space of the column filled with the apatite represented by the formula Ca(PO)((OH)X), where the X represents at least one kind of halogen elements and 0&#x2266;b&#x2266;1.

Adsorbent, adsorption apparatus, and method for manufacturing the adsorption apparatus

A method for producing an adsorbent which is stable toward a liquid such as an eluant and which shows excellent reproducibility in selectively adsorbing and separating an object compound, the method includes the steps of: preparing a base material having a surface, in which at least part of the surface of the base material is formed of a material containing as its major component apatite which is represented by the composition formula Ca(PO)((OH)X); preparing a solution containing ions of at least one metal element; substituting at least part of Ca of the apatite by the at least one metal element by bringing the base material into contact with the solution to obtain a substituted base material; and subjecting the substituted base material to heat treatment at 50 to 400&#xb0; C. for 0.5 to 10 hours, wherein the base material and the substituted base material are not exposed to a temperature exceeding 500&#xb0; C. for 4 hours or longer from the substitution step to the completion of production of the adsorbent.

Method for producing adsorbent, adsorbent, and adsorption apparatus

A method of producing a fluoroapatite is provided. The method comprises preparing a slurry containing a hydroxyapatite which has at least one hydroxyl group, preparing a hydrogen fluoride-containing solution containing a hydrogen fluoride, mixing the hydrogen fluoride-containing solution with the slurry to obtain a mixture to thereby adjust a pH of the mixture in the range of 2.5 to 5, and reacting the hydroxyapatite with the hydrogen fluoride in the mixture in a state that the pH of the mixture is adjusted within the above range to thereby obtain the fluoroapatite by substituting the at least one hydroxyl group of the hydroxyapatite with fluorine atom of the hydrogen fluoride. The method can produce the fluoroapatite having improved acid resistance by reducing an impurity, such as ammonia, derived from a raw material to a low or very low level. Further, a fluoroapatite having high acid resistance is also provided. Furthermore, an adsorption apparatus using such a fluoroapatite is provided.

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Tokyo, Japan

Tomohiko Yoshitake