Preparation of zeolites 4A and/or 13X
AssigneeRhone-Poulenc Chimie de Base
InventorsBertrand Latourrette, Anne Menesguen
Life of this patent
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Abstract
Zeolites well suited for detergency, e.g., zeolites of type A, are adopted for mass production by simultaneously continuously introducing both an aqueous solution of sodium silicate and an aqueous solution of sodium aluminate into an unagitated first reaction zone to effect the continuous intimate admixture thereof, continuously transferring intimate admixture from said first reaction zone to a second zone of gelation to effect the continuous homogeneous gelling thereof, the time of retention of said intimate admixture in said first reaction zone being less than that period of time required for the gelation thereof, and thence effecting crystallization of a zeolite from said homogeneous gel.
Claims14
A process for the preparation of a zeolite of types 4A and/or 13X comprising simultaneously and continuously introducing as a fluid stream both an aqueous solution of sodium silicate and an aqueous solution of sodium aluminate into a tubular reactor to effect the continuous intimate admixture thereof, continuously transferring said intimate admixture from said tubular reactor to a zone of gelation to effect the continuous homogeneous gelling thereof, said intimate admixture being carried out at a Reynolds number of at least twice the value of the critical Reynolds number of the fluid stream, the time of retention of said intimate admixture in said tubular reactor being less than that period of time required for the gelation thereof, and thence effecting crystallization of a zeolite from said homogeneous gel.
Dependencies are inferred from the claim text.