Patent ID: 6376405
Filing Date: 2002-04-23
Classification: B01J,C01F,C01P

Abstract:
A process for the preparation of anionic clays comprising, reacting an aluminum source and a magnesium source in aqueous suspension at a temperature above 100Â° C. and a pressure above atmospheric pressure to obtain an anionic clay, the aluminum source comprising two types of aluminum-containing compounds, wherein one type of aluminum-containing compound is aluminum trihydrate or its thermally treated form, and the anionic clay has the general formula:[Mgm2+Aln3+(OH)2m+n](Xn/zzâˆ’).bH2O wherein m and n have a value such that m/n=1 to 10, b has a value in the range of from 0 to 10, and Xn/zzâˆ’ is at least one selected from the group consisting of CO32âˆ’, OH31  and an anion present in interlayers of the anionic clay.