US 12,391,567 B1
Extraction of alkaline earth metal hydroxides from produced oilfield brine
Salem Alshammari, Dhahran (SA); Hussain Habib Al Saleem, Al Qatif (SA); Salah Hamad Al-Saleh, Dhahran (SA); Subhash Ayirala, Dhahran (SA); and Ali Yousef, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jul. 1, 2024, as Appl. No. 18/760,892.
Int. Cl. C01F 11/02 (2006.01); C01F 5/14 (2006.01); C01F 5/24 (2006.01); C01F 11/18 (2006.01)
CPC C01F 11/182 (2013.01) [C01F 5/14 (2013.01); C01F 5/24 (2013.01); C01F 11/02 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of producing hydroxides for use in carbon dioxide mineralization, the method comprising:
adding a first amount of sodium hydroxide (NaOH) to a produced oilfield brine, wherein the produced oilfield brine comprises magnesium and calcium ions, to yield a first treated brine, wherein the first treated brine comprises Mg(OH)2 precipitates and 0.1% to 1% NaOH by weight;
filtering the Mg(OH)2 precipitates from the first treated brine to yield a filtered treated brine;
adding a second amount of NaOH to the filtered treated brine to yield a second treated brine, wherein the second treated brine comprises Ca(OH)2 precipitates and 1.0% to 3.5% NaOH by weight;
filtering the Ca(OH)2 precipitates from the second treated brine to yield a softened water; and
adding an amount of the filtered Mg(OH)2 precipitates, an amount of the filtered Ca(OH)2 precipitates, or a combination thereof to a solution comprising aqueous carbon dioxide to yield carbonate precipitates.