Method of synthesising sodium zincosilicate and stannosilicate and ion-exchanged products thereof,detergent formulations containing the sodium zincosilicate or stannosilicate products and catalysts or catalyst supports containing the ion-exchanged products.

摘要

Sodium zinco/stanno/titano-silicate is synthesised by mixing a concentrated aqueous sodium zincate (stannate, titanate) solution with a source of silica (e.g. powdered glass or sodium metasilicate solution) in the ratio 60g sodium silicate to sodium zincate equivalent to 8.1g zinc oxide, keeping the temperature at 40°C for hour, diluting threefold with water of 20°C, allowing a precipitate to form overnight, and filtering and drying the residue at 110°C.

The resulting sodium zincosilicate may be used in its own right as a water softener or may be converted by cation exchange into any other desired zincosilicate.