CO 2 mineralization in produced and industrial effluent water by pH-swing carbonation

Patent metadata

Field	Value
Publication number	US-11919775-B2
Application number	US-202117552194-A
Country	US
Kind code	B2
Filing date	Dec 15, 2021
Priority date	Jun 30, 2017
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

Effluent water is combined with carbon dioxide sourced from a carbon dioxide-containing emission stream to produce a reaction solution. The pH of the reaction solution is controlled to induce precipitation of a carbonate salt from the reaction solution.

First claim

What is claimed is:

1. A method comprising:
combining effluent water with carbon dioxide sourced from a carbon dioxide-containing emission stream to produce a reaction solution; and
controlling the pH of the reaction solution with a regenerable, heterogeneous pH buffer agent to induce precipitation of a carbonate salt from the reaction solution;
wherein the carbon dioxide-containing emission stream is a flue gas stream; and
the regenerable heterogeneous pH buffer agent is a polymer-supported buffer agent or a zeolite that supports cation exchange reactions.

2. The method of claim 1 , wherein controlling the pH includes increasing the pH of the reaction solution.

3. The method of claim 1 , wherein controlling the pH includes adjusting the pH of the reaction solution to 6 or greater.

4. The method of claim 1 , wherein controlling the pH includes adjusting the pH of the reaction solution to 6.5 or greater.

5. The method of claim 1 , further comprising, subsequent to the precipitation of the carbonate salt, recovering the regenerable, heterogeneous pH buffer agent by filtration.

6. The method of claim 1 , wherein the flue gas stream comprises from about 1% CO 2 to about 100% CO 2 .

Assignees

• Univ California

Inventors

• Sant Gaurav N
• Kweon Hyukmin
• La Plante Erika Callagon
• Simonetti Dante Adam

Classifications

• C01B32/60 Primary

  Preparation of carbonates or bicarbonates in general (of percarbonates C01B15/10; of specific carbonates or bicarbonates according to the cation C01B-C01G) · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title

• B01D53/62

  Carbon oxides · CPC title

• B01D53/78

  with gas-liquid contact · CPC title

• C01F11/183

  the additive being an organic compound · CPC title