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

Patent · Tue Jun 22 04:00:00 EDT 2021

OSTI ID:1824089

Sant, Gaurav; Wei, Zongsu; Wang, Bu; La Plante, Erika Callagon; Simonetti, Dante A.

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.

• Research Organization: Univ. of California, Oakland, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: FE0029825; FE0031705
• Assignee: The Regents of the University of California (Oakland, CA)
• Patent Number(s): 11,040,898
• Application Number: 16/431,300
• OSTI ID: 1824089
• Country of Publication: United States
• Language: English