US 12,421,123 B2
Methods for extracting boron from an organic solution
Chi Hung Cheng, Baton Rouge, LA (US)
Assigned to ALBEMARLE CORPORATION, Charlotte, NC (US)
Appl. No. 17/423,250
Filed by Albemarle Corporation, Charlotte, NC (US)
PCT Filed Jan. 31, 2020, PCT No. PCT/US2020/016013
§ 371(c)(1), (2) Date Jul. 15, 2021,
PCT Pub. No. WO2020/167495, PCT Pub. Date Aug. 20, 2020.
Claims priority of provisional application 62/806,206, filed on Feb. 15, 2019.
Prior Publication US 2022/0081306 A1, Mar. 17, 2022
Int. Cl. C01B 35/12 (2006.01); B01D 11/04 (2006.01); C02F 1/02 (2023.01); C02F 1/26 (2023.01)
CPC C01B 35/124 (2013.01) [B01D 11/0492 (2013.01); C02F 1/02 (2013.01); C02F 1/26 (2013.01)] 6 Claims
 
1. A method comprising:
(A) combining in a container:
(i) a combination comprising an alcohol, an organic solvent, and boron; and
(ii) an aqueous solution comprising about 3 wt. % to about 25 wt. % of an alkali hydroxide based on total weight of the aqueous solution;
(iii) wherein the molar ratio of the alkali hydroxide to the boron is about 0.5 to 2.0;
(iv) wherein the volume ratio of the combination of (i) to the aqueous solution of (ii) is in the range of from 13:1 to 25:1; and
(B) heating the combination of (i) and the aqueous solution of (ii) in the container to a temperature in the range of from 20° C. to 100° C. until the content comprises an organic layer and an aqueous layer, and the aqueous layer comprises greater than about 95% of the boron from the combination;
(C) separating the aqueous layer from the content of the container;
(D) separating greater than about 50% of the boron from the aqueous layer; and
(E) using the aqueous layer remaining after (D) as all or part of the aqueous solution in (A).