Buffer-free process cycle for CO2 sequestration and carbonate production from brine waste streams with high salinity

US11827542B2 · kind B2 · utility

Assignee

• The Regents of the University of California · US

Inventors

• Gaurav Sant · Los Angeles, US
• Zongsu Wei · Los Angeles, US
• Bu Wang · Los Angeles, US
• Erika Callagon La Plante · Los Angeles, US
• Dante Simonetti · Middleton, US

Key dates

• Filing date: Aug 15, 2022
• Grant date: Nov 28, 2023
• Expiry date: Aug 15, 2042

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02C20/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A method includes: (1) using a chelating agent, extracting divalent ions from a brine solution as complexes of the chelating agent and the divalent ions; (2) using a weak acid, regenerating the chelating agent and producing a divalent ion salt solution; and (3) introducing carbon dioxide to the divalent ion salt solution to induce precipitation of the divalent ions as a carbonate salt. Another method includes: (1) combining water with carbon dioxide to produce a carbon dioxide solution; (2) introducing an ion exchanger to the carbon dioxide solution to induce exchange of alkali metal cations included in the ion exchanger with protons included in the carbon dioxide solution and to produce a bicarbonate salt solution of the alkali metal cations; and (3) introducing a brine solution to the bicarbonate salt solution to induce precipitation of divalent ions from the brine solution as a carbonate salt.