Process for the multi-reactor synthesis of zeolite crystals having a controlled particle size
AssigneeArkema France
InventorsSerge Nicolas, Cécile Lutz
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Abstract
The present invention relates to a process for preparing zeolite crystals having a multimodal particle size distribution, and the sizes of which are between 0.02 μm and 20 μm, said process comprising feeding at least two reactors each with a synthesis gel capable of forming zeolite crystals, carrying out a crystallization reaction, in parallel, in each of the at least two reactors, and mixing the reaction media of the at least two reactors, after the start of at least one of the crystallization reactions.
Claims12
Process for preparing zeolite crystals having a multimodal particle size distribution, and the sizes of which are between 0.02 μm and 20 μm, said process comprising at least the following steps:
- a) preparing a synthesis gel by mixing at least one source of silica, at least one source of alumina and optionally, at least one aqueous alkali or alkaline-earth metal hydroxide solution,
- b) feeding at least two reactors each with a synthesis gel capable of forming zeolite crystals,
- c) carrying out a crystallization reaction, in parallel, in each of the at least two reactors,
- d) mixing the reaction media of the at least two reactors, and
- e) filtering the mixture of the reaction media obtained in step d), in order to separate the crystals produced from the mother liquors.
Dependencies are inferred from the claim text.