US 11,746,021 B2
High purity aluminum oxide via electrodialysis
Joseph J. Stevens, III, West Point, MS (US)
Assigned to NextChem, LLC, West Point, MS (US)
Filed by NextChem, LLC, West Point, MS (US)
Filed on Apr. 16, 2020, as Appl. No. 16/850,261.
Claims priority of provisional application 62/835,585, filed on Apr. 18, 2019.
Prior Publication US 2020/0331769 A1, Oct. 22, 2020
Int. Cl. C01F 7/306 (2022.01); C01F 7/62 (2006.01); B01D 61/42 (2006.01)
CPC C01F 7/306 (2013.01) [B01D 61/422 (2013.01); C01F 7/62 (2013.01); B01D 2257/60 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for the production of aluminum oxide comprising the steps:
providing an aluminum salt in an initial aluminum salt solution;
subjecting the initial aqueous aluminum salt solution to electrodialysis to remove non-aluminum monovalent and/or multivalent cations from the initial aqueous aluminum salt solution, wherein a purified aqueous aluminum salt solution is produced with a reduction of non-aluminum monovalent and/or multivalent cations from the initial aqueous aluminum salt solution; and subjecting the purified aluminum salt solution to heating to provide aluminum oxide.