Method of producing product inorganic compound and product inorganic compound

Patent metadata

Field	Value
Publication number	US-11730856-B2
Application number	US-202016745615-A
Country	US
Kind code	B2
Filing date	Jan 17, 2020
Priority date	Sep 1, 2014
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A method of producing a product inorganic compound including: immersing a raw material inorganic compound having a volume of 10−13 m3 or more in an electrolyte aqueous solution or an electrolyte suspension; exchanging anions in the raw material inorganic compound with anions in the electrolyte aqueous solution or the electrolyte suspension; cations in the raw material inorganic compound are exchanged with cations in the electrolyte aqueous solution or the electrolyte suspension; or including a component (that excludes water, hydrogen, and oxygen) in the electrolyte aqueous solution or the electrolyte suspension not included in the raw material inorganic compound in the raw material inorganic compound; and obtaining a product inorganic compound having a volume of 10−13 m3 or more from the raw material inorganic compound.

First claim

The invention claimed is:

1. A method of producing a product inorganic compound, the method comprising the following steps:
(A) immersing a raw material inorganic compound in an electrolyte aqueous solution;
(B) forming a precipitated inorganic compound layer on unreacted raw material inorganic compound, comprising:
(B1) exchanging anions in the raw material inorganic compound with anions in the electrolyte aqueous solution, wherein the anions in the electrolyte aqueous solution consist of at least one selected from the group consisting of carbonate ions, bicarbonate ions, sulfate ions, and hydrogen sulfate ions, or
(B2) exchanging cations in the raw material inorganic compound with cations in the electrolyte aqueous solution; and

(C) obtaining a product inorganic compound from the raw material inorganic compound,
wherein:
the raw material inorganic compound:
is an artificial material comprising at least one of calcium carbonate and calcium phosphate,
is an interconnected porous body,
has a volume of 10 −13 m 3 or more, and
has a solubility that is greater than 0 and 5 or less with respect to distilled water or the electrolyte aqueous solution at 20° C.; and

the product inorganic compound:
has a volume of 10 −13 m 3 or more, and
comprises:
a core portion comprising the unreacted raw material inorganic compound, and
a surface layer portion comprising the precipitated inorganic layer covering the core portion.

2. The method of producing a product inorganic compound according to claim 1 , wherein:
the product inorganic compound is a porous body including pores having an aspect ratio of at least 2 or more, and
a porosity of the raw material inorganic compound is 30% or more.

3. The method of producing a product inorganic compound according to claim 1 , wherein the surface layer portion comprises at least one selected from the group consisting of calcium hydrogen phosphate, calcium carbonate, and apatite.

4. The method of producing a product inorganic compound according to claim 1 , wherein step (C) comprises curing the precipitated inorganic compound layer formed in step (B), thereby bridging a plurality of the raw material inorganic compound to form the product inorganic compound having an interconnected porous body.

5. The method of producing a product inorganic compound according to claim 1 , wherein the core portion further comprises a support.

6. The method of producing a product inorganic compound according to claim 5 , wherein the support comprises at least one selected from the group consisting of a metal, a polymer, and a ceramic.

7. The method of producing a product inorganic compound according to claim 1 , wherein a temperature at which the raw material inorganic compound is immersed in the electrolyte aqueous solution or the electrolyte suspension is 10° C. or less.

8. The method of producing a product inorganic compound according to claim 1 , wherein the electrolyte aqueous solution includes carbonate ions.

9. The method of producing a product inorganic compound according to claim 1 , wherein the electrolyte aqueous solution includes bicarbonate ions.

10. The method of producing a product inorganic compound according to claim 1 , wherein the electrolyte aqueous solution includes sulfate ions.

11. The method of producing a product inorganic compound according to claim 1 , wherein the electrolyte aqueous solution includes hydrogen sulfate ions.

Assignees

• Univ Kyushu Nat Univ Corp

Inventors

• Ishikawa Kunio
• ISHIKAWA Maho
• NAKASHIMA Yasuharu

Classifications

• C04B40/0231

  Carbon dioxide hardening · CPC title

• A61L27/02 Primary

  Inorganic materials · CPC title

• A61L27/12

  Phosphorus-containing materials, e.g. apatite · CPC title

• C01B25/32

  Phosphates of magnesium, calcium, strontium, or barium · CPC title

• C01B25/327

  After-treatment · CPC title