Two powder synthesis of hydrotalcite and hydrotalcite-like compo

Details Two powder synthesis of hydrotalcite and hydrotalcite-like compo Two powder synthesis of hydrotalcite and hydrotalcite-like compo

1996-03-28

1998-03-17

Langel, Wayne

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423306, 423367, 423395, 4234202, 423463, 423556, 423557, 423558, 423594, 423595, 423599, 423600, 534 15, 534 16, 556 1, 556 13, 556 15, 556 16, 556 19, 556 43, 556 44, 556 46, 556 49, 556 58, 556 61, 556 62, 556 87, 556 90, 556112, 556114, 556121, 556131, 556140, 556147, C07F 1100, C07F 1300

Patent

active

057283630

ABSTRACT:
There is provided an improved method for making synthetic hydrotalcite by first reacting powdered magnesium oxide with a high surface area, transition alumina in a solution or suspension to form a meixnerite-like intermediate. This intermediate is then contacted with an anion source such as an acid, and most preferably carbon dioxide, to form the layered double hydroxide which is separated from the suspension by filtering, centrifugation, vacuum dehydration or other known means. On a preferred basis, the transition alumina combined with activated magnesia consists essentially of an rehydratable alumina powder having a surface area of 100 m.sup.2 /g or greater. To make related double hydroxide compounds, still other reactants such as bromides, chlorides, boric acids, or salts thereof, may be substituted for the carbon dioxide gas fed into this suspension.

REFERENCES:
patent: 5399329 (1995-03-01), Schutz et al.
patent: 5578286 (1996-11-01), Martin et al.

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