CO2 mineralization in produced and industrial effluent water by pH-swing carbonation

Patent metadata

Field	Value
Publication number	US-11230473-B2
Application number	US-201816627238-A
Country	US
Kind code	B2
Filing date	Jun 29, 2018
Priority date	Jun 30, 2017
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

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 regenerable heterogeneous pH buffer agent is a clay to support ion exchange reaction, or a polymer-supported buffer agent.

2. The method of claim 1 , wherein the method further comprises regenerating the regenerable heterogeneous pH buffer agent.

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

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

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

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

7. The method of claim 1 , wherein the carbon dioxide-containing emission stream is a flue gas stream.

8. A method comprising:
combining effluent water with carbon dioxide sourced from a carbon dioxide-containing emission stream to produce a reaction solution; and
inducing precipitation of a carbonate salt from the reaction solution in the presence of a regenerable heterogeneous pH buffer agent, wherein the regenerable heterogeneous pH buffer agent is a clay to support ion exchange reaction, or a polymer-supported buffer agent.

9. The method of claim 8 , further comprising, subsequent to the precipitation of the carbonate salt, recovering the regenerable heterogeneous pH buffer agent by filtration.

10. The method of claim 8 , wherein inducing the precipitation of the carbonate salt includes controlling the pH of the reaction solution using the regenerable heterogeneous pH buffer agent.

11. The method of claim 8 , wherein the carbon dioxide-containing emission stream is a flue gas stream.

Assignees

• Univ California

Inventors

• Sant Gaurav N
• Kweon Hyukmin
• Callagon La Plante Erika
• 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

• F01K17/04

  for specific purposes other than heating (F01K17/06 takes precedence) · CPC title

• B01D2252/103

  Water · CPC title

• Y02P20/129

  Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines · CPC title

• E21B43/00

  Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B) · CPC title