Patent ID: 6362261
Filing Date: 2002-03-26
Classification: C01F

Abstract:
A method of preparing a modified cationic layer compound, said method comprising:(a) providing a layer compound of the general formula (I): [EeZzDdVv(OHâˆ’)x](Anâˆ’)a.qH2Oâ€ƒâ€ƒ(I) wherein E represents one or more monovalent alkali metal cations, e represents a number of from 0 to about 2, Z represents one or more divalent metal cations, z represents a number of from 0 to about 6, D represents one or more trivalent metal cations, d represents a number of from 0 to about 3, V represents one or more tetravalent metal cations, v represents a number of from 0 to about 1, (Anâˆ’) represents an acid anion wherein n represents an integer of from 1 to 3, q represents a number of from about 1 to about 10, and wherein x>a and e+2z+3d+4v=x+na; (b) subjecting the layer compound to crystallization to provide a resultant material; and (c) subjecting the resultant material to steam drying at a temperature of from about 200Â° C. to about 260Â° C. for a period of time of from about 3 to about 6 hours, said steam drying comprising passing a source of steam continuously over the resultant material at a rate of from about 0.001 to about 10 moles of water per hour, per kilogram of the resultant material.