Aluminosilicates

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 39/28 (2006.01)

Patent

CA 2175576

Process for manufacturing an alkali metal aluminosilicate of zeolite P type, wherein sodium silicate solution, sodium aluminate solution and sodium hydroxide are mixed together in a first reacting zone, the mixture reacting to form amorphous aluminosilicate and supersaturated mother liquor and being then transferred from this first reacting zone to a second reacting zone, the transferred mixture having a degree of crystallinity below 30 %, preferably 20 %, the mixture being afterwards allowed to fully convert into P type zeolite, the resulting product being eventually filtered, washed and dried.

Procédé de fabrication d'un aluminosilicate de métal alcalin, du type zéolite P, selon lequel une solution de silicate de sodium, une solution d'aluminate de sodium et de l'hydroxyde de sodium sont mélangés dans une première zone de réaction, le mélange réagissant pour former de l'aluminosilicate amorphe et une liqueur mère sursaturée, et étant ensuite transféré de cette première zone de réaction vers une seconde zone de réaction. Le mélange transféré présente une cristallinité inférieure à 30 %, de préférence à 20 %. On laisse ensuite le mélange se convertir entièrement en zéolite de type P, le produit obtenu étant éventuellement filtré, lavé et séché.

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