Granted Patent B2

US 12,319,584 · App. 17/779,374 · Granted Jun 3, 2025

Inventor: Masayuki Inui (Kanagawa, JP)

Assignee: Mitsubishi Heavy Industries, Ltd.

C01F11/18B01D53/62B01D53/80B01D2257/504

Abstract

Claims (12)

1. A carbon dioxide fixation method, comprising:

a step of preparing a calcium-containing substance containing calcium;

a step of preparing a calcium extraction substance for extracting calcium ions from the calcium-containing substance by a reaction with the calcium-containing substance to produce a calcium-containing intermediate;

a step of mixing the calcium-containing substance and the calcium extraction substance to produce a gel including the calcium-containing intermediate;

a step of supplying a basic substance and carbon dioxide to the gel including the calcium-containing intermediate to precipitate calcium carbonate which is slightly soluble; and

a step of removing the precipitated calcium carbonate.

2. The carbon dioxide fixation method according to claim 1 , wherein a residual substance from which calcium carbonate has been removed is reused as the calcium extraction substance.

3. The carbon dioxide fixation method according to claim 1 , further comprising:

a step of capturing carbon dioxide in the atmosphere, wherein

the carbon dioxide captured from the atmosphere is supplied to the gel including the calcium-containing intermediate.

4. The carbon dioxide fixation method according to claim 1 , wherein the calcium extraction substance is at least one of carboxylic acid or carboxylate having a linear or cyclic carbon chain, protein containing a carboxyl group, or pectin.

5. The carbon dioxide fixation method according to claim 1 , wherein the calcium-containing substance is gypsum, wollastonite, or phosphate rock.

Assignments (3)

Priority Claims (1)

Continuity (1)

References Cited (11)