Method of making crystalline 2-layer lithium aluminates in ion exchange resins
AssigneeThe Dow Chemical Company
InventorJohn L. Burba, III
Life of this patent
Estimating the term…
Abstract
The bayerite form of crystalline alumina, Al(OH).sub.3, contained within a macroporous ion exchange resin is converted to the gibbsite form of Al(OH).sub.3 by reaction with hot MgX.sub.2, where X is halide, followed by water-washing the MgX.sub.2 portion from the product, thereby causing the conversion of bayerite to the gibbsite form of crystalline Al(OH).sub.3. The gibbsite form may then be reacted with hot LiX solution, where X is anion, to form crystalline 2-layer LiX.2Al(OH).sub.3.nH.sub.2 O.
Claims20
A process for converting crystalline hydrous alumina, Al(OH).sub.3, bayerite, dispersed within a macroporous ion exchange resin to the gibbsite form, said process comprising
- reacting the bayerite/resin composite with a MgX.sub.2 solution, where X is halide, at elevated temperature, and
- water-washing the MgX.sub.2 portion from the so-formed product, thereby causing the formation of the gibbsite form of Al(OH).sub.3 in the resin.
A process for preparing crystalline 2-layer LiX.2Al(OH).sub.3.nH.sub.2 O, where X is anion and nH.sub.2 O represents waters of hydration, said process comprising
- reacting bayerite, dispersed within a macroporous ion exchange resin, with a MgX.sub.2 solution, where X is halide, at elevated temperature, then water-washing the MgX.sub.2 portion from the so-formed product, thereby causing the formation of gibbsite from the bayerite in the resin,
- then reacting the so-sormed gibbsite with hot LiX solution, where X is anion, thereby converting the gibbsite to crystalline 2-layer LiX.Al(OH).sub.3.nH.sub.2 O.
Dependencies are inferred from the claim text.