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

{
  "publication_number": "US11230473B2",
  "country": "US",
  "kind": "B2",
  "title": "CO2 mineralization in produced and industrial effluent water by pH-swing carbonation",
  "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.",
  "claims": [
    "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."
  ],
  "cpc": [
    "C01B 32/60",
    "B01D 2252/103",
    "B01D 2252/60",
    "B01D 2257/504",
    "B01D 2258/0283",
    "B01D 53/1475",
    "B01D 53/62",
    "B01D 53/78",
    "C01D 7/00",
    "C01F 11/183",
    "C01F 11/188",
    "E21B 43/00",
    "E21B 43/20",
    "F01K 17/04",
    "Y02P 20/129"
  ],
  "assignees": [
    "UNIV CALIFORNIA"
  ],
  "filing_date": "2018-06-29",
  "publication_date": "2022-01-25",
  "grant_date": "2022-01-25",
  "priority_date": "2017-06-30",
  "application_number": "US-201816627238-A",
  "family_id": "64742721",
  "citations": [
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  ]
}