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US 4,271,043 AGranted
Pillared interlayered clay products
AssigneeW. R. Grace & Co.
InventorsDavid E. W. Vaughan, Roger J. Lussier, John S. Magee, Jr.
Life of this patent
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Abstract
Pillared interlayered clays are reacted with a base such as ammonium hydroxide to increase the ion exchange capacity thereof. The pillared interlayered clays are prepared by reacting a smectite clay, such as bentonite, with a metal complex polymer, such as chlorhydrol, and calcining the resulting product.
Claims12
A process for preparing a pillared interlayered clay product having a high degree of ion exchange capacity which comprises:
- (a) reacting a smectite clay with a mixture of a polymeric cationic hydroxy metal complex selected from the group consisting of polymeric cationic hydroxy aluminum and zirconium complexes and water to obtain a pillared interlayered smectite;
- (b) calcining said interlayered smectite to obtain an interlayered clay product having greater than 50% of its surface area in pores less than 30 A in diameter;
- and
- (c) reacting said calcined interlayered clay product with a base to increase the ion exchange capacity thereof.
1 more element
The method of claim 6 wherein said base is reacted with the interlayered smectite during calcination.
Dependencies are inferred from the claim text.