Direct synthesis of anion substituted hydrotalcite

Details Direct synthesis of anion substituted hydrotalcite Direct synthesis of anion substituted hydrotalcite

1992-08-13

1994-11-08

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423126, 423128, 423431, 423432, 4234202, C01F 500, C01F 700, C01F 524, C01B 3124

Patent

active

053624572

ABSTRACT:
A method for producing an anion intercalated hydrotalcite without first forming hydrotalcite and then having to activate the hydrotalcite prior to substituting anions in the hydrotalcite structure. The method includes reacting an activated magnesia with an aqueous solution of aluminate, anion, such as bromide, chloride, sulfate, borate and combinations thereof and hydroxyl ions. The method can be carried out at atmospheric pressure to form hydrotalcite in high purity and high yield. In a preferred embodiment of the invention, the aluminate solution is formed from sodium aluminate, sodium bromide and sodium hydroxide and the aqueous solution is substantially carbonate free. Other anion intercalated hydrotalcites can also be produced by the method of the present invention.

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