Method for simultaneous carbon dioxide capture and valorization of industrial brine using a two-stage electrodialysis process

Patent metadata

Field	Value
Publication number	US-12522524-B2
Application number	US-202418961927-A
Country	US
Kind code	B2
Filing date	Nov 27, 2024
Priority date	May 24, 2023
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A system of treating reject brine and capturing carbon dioxide (CO2) includes a two-stage electrodialysis (ED) process for producing multiple products with high purity from rejected brine and flue gas mixtures (10% CO2 and 90% N2) emitted from an industrial plant. According to an embodiment, the system includes a first electrodialysis (ED) stage and a second electrodialysis (ED) stage in series.

First claim

The invention claimed is:

1 . A method of desalinating reject brine and flue gas emitted from an industrial plant, comprising:
providing a first electrodialysis (ED) stage including a first anolyte chamber, a first catholyte chamber, and a plurality of cell pairs therebetween, each of the cell pairs including a multivalent ion chamber and a monovalent ion chamber separated by a first anion exchange membrane; providing reject brine from the industrial plant to the multivalent ion chamber and water to the monovalent ion chamber of each of the cell pairs in the first ED stage; transporting NaCl and monovalent ions from the reject brine in the multivalent ion chamber through the first anion exchange membrane to the monovalent ion chamber; collecting a stream of water and a multivalent ion mixture in a first output stream from the multivalent ion chamber and a concentrated NaCl rejected brine in a second output stream from the monovalent ion chamber; providing a second ED stage including a plurality of cell groups between second anolyte and catholyte chambers, each of the cell groups including a flue gas chamber, a carbonate chamber, a second anion exchange membrane separating the flue gas chamber and the carbonate chamber, a concentrated brine chamber, a cation exchange membrane separating the carbonate chamber and the concentrated brine chamber, an acid chamber, and a third anion exchange membrane separating the concentrated brine chamber and the acid chamber; providing concentrated NaCl reject brine from the first ED stage to the concentrated brine chamber; providing water to the acid chamber; dissolving CO 2 from flue gas emitted from the industrial plant to provide CO 3 −2 and HCO 3 −1 ions from CO 2 using a bubble column contactor; transporting the CO 3 −2 and HCO 3 −1 ions to the carbonate chamber through the second anion exchange membrane between the flue gas chamber and the carbonate chamber; transporting sodium ions from the concentrated brine chamber to the carbonate chamber through the cation exchange membrane to produce a sodium carbonate mixture; and transporting Cl ions from the concentrated brine chamber to the acid chamber through the third anion exchange membrane to produce an acid mixture.

2 . The method of claim 1 , wherein the sodium carbonate mixture includes Na 2 CO 3 and NaHCO 3 .

3 . The method of claim 2 , further comprising transferring the sodium carbonate mixture to a freeze dryer to produce a solid powder mixture of Na 2 CO 3 and NaHCO 3 .

4 . The method of claim 1 , wherein an electrolyte is circulated between the first catholyte and anolyte chambers of the first ED stage.

5 . The method of claim 4 , wherein the electrolyte is sulphamic acid.

6 . The method of claim 1 , wherein an electrolyte is separately circulated in each of the second anolyte and catholyte chambers of the second ED stage.

7 . The method of claim 6 , wherein the electrolyte circulated in the anolyte chamber is sulphamic acid and the electrolyte circulated in the catholyte chamber is sodium hydroxide.

8 . The method of claim 1 , wherein the flue gas includes about 10% CO 2 .

Assignees

• Univ United Arab Emirates

Inventors

• Mustafa Jawad
• Al-Marzouqi Ali H
• Ghasem Nayef Mohamed

Classifications

• C02F1/265 Primary

  Desalination · CPC title

• C02F1/66

  by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58) · CPC title

• C02F2103/08

  Seawater, e.g. for desalination · CPC title

• C02F1/4693 Primary

  electrodialysis · CPC title

• Y02C20/40

  of CO2 · CPC title