Processes for preparing inorganic carbonates

Patent metadata

Field	Value
Publication number	US-11548790-B2
Application number	US-201716330439-A
Country	US
Kind code	B2
Filing date	Sep 4, 2017
Priority date	Sep 7, 2016
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

The present invention aims to provide techniques for efficiently synthesizing inorganic microparticles. According to the present invention, inorganic carbonate microparticles can be synthesized by generating ultrafine bubbles containing carbonic acid gas by injecting a gas containing carbonic acid gas and a liquid into a reaction vessel through a nozzle to deposit an inorganic carbonate having an average primary particle size of 300 nm or less in the presence of the ultrafine bubbles.

First claim

The invention claimed is:

1. A process for preparing an inorganic carbonate, comprising generating ultrafine bubbles containing carbonic acid gas by injecting a gas containing the carbonic acid gas and a liquid into a reaction vessel through a nozzle to deposit the inorganic carbonate having an average primary particle size of 300 nm or less in the presence of the ultrafine bubbles,
wherein the ultrafine bubbles have an average particle size of 1 to 300 nm,
the inorganic carbonate is calcium carbonate or magnesium carbonate, and
the gas containing the carbonic acid gas and the liquid are emitted from the nozzle at a flow rate of 100 to 640 L/min per cm 2 .

2. The process of claim 1 , wherein an average duration from a generation of the ultrafine bubbles to a disappearance of the ultrafine bubbles is 10 seconds or more.

3. The process of claim 2 , wherein the inorganic carbonate is calcium carbonate.

4. A process for preparing an inorganic carbonate and fiber complex using the process of claim 3 , and further comprising depositing the inorganic carbonate on a fiber in the presence of the fiber.

5. The process of claim 4 , wherein the fiber is a cellulose fiber.

6. The process of claim 2 , wherein the inorganic carbonate is magnesium carbonate.

7. A process for preparing an inorganic carbonate and fiber complex using the process of claim 6 , and further comprising depositing the inorganic carbonate on a fiber in the presence of the fiber.

8. The process of claim 7 , wherein the fiber is a cellulose fiber.

9. A process for preparing an inorganic carbonate and fiber complex using the process of claim 1 , and further comprising depositing the inorganic carbonate on a fiber in the presence of the fiber.

10. The process of claim 9 , wherein the fiber is a cellulose fiber.

11. The process of claim 1 , wherein the inorganic carbonate is calcium carbonate.

12. A process for preparing an inorganic carbonate and fiber complex using the process of claim 11 , and further comprising depositing the inorganic carbonate on a fiber in the presence of the fiber.

13. The process of claim 12 , wherein the fiber is a cellulose fiber.

14. The process of claim 1 , wherein the inorganic carbonate is magnesium carbonate.

15. A process for preparing an inorganic carbonate and fiber complex using the process of claim 14 , and further comprising depositing the inorganic carbonate on a fiber in the presence of the fiber.

16. The process of claim 15 , wherein the fiber is a cellulose fiber.

17. The process of claim 1 wherein the gas containing the carbonic acid gas and the liquid are emitted from the nozzle at a flow rate of 100 to 300 L/min per cm 2 .

18. The process of claim 1 , wherein an average duration from a generation of the ultrafine bubbles to a disappearance of the ultrafine bubbles is 60 minutes or more.

Assignees

• Jujo Paper Co Ltd

Inventors

• Oishi Masatoshi
• Nakatani Toru
• Fukuoka Moe
• Goto Shisei

Classifications

• D21H17/70

  forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately · CPC title

• C01F11/181 Primary

  Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions · CPC title

• D06M11/76

  with carbon oxides or carbonates (D06M11/75 takes precedence; with percarbonic acids or their salts D06M11/50; with urea D06M13/432) · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title