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

1996-04-09

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

057283648

ABSTRACT:
There is provided an improved method for making synthetic hydrotalcite by first reacting a divalent metal compound with a trivalent metal oxide powder in a carboxylic acid-free, aqueous solution or suspension to form an intermediate. This intermediate is then contacted with an anion source such as carbon dioxide; a carbonate-containing compound; an acid or an ammonium salt to form a layered double hydroxide having the formula:
A.sub.1-x B.sub.x (OH).sub.2 C.sub.z.mH.sub.2 O, where A represents a divalent metal cation, B represents a trivalent metal cation, C represents a mono- to polyvalent anion, and x, z and m satisfy the following conditions: 0.09<x<0.67; z=x
, where n=the charge on the anion; and 2>m>0.5. Said layered double hydroxide is typically separated from the suspension by filtering, centrifugation, vacuum dehydration or other known means.

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

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