Method for quickly synthesizing zeolite molecular sieve by microwave solid-phase method

Abstract

The invention provides a method for quickly synthesizing a zeolite molecular sieve by the microwave solid-phase method, and belongs to the technical field of synthesis of the zeolite molecular sieves. The method comprises the following steps: mixing and grinding a solid silicon source, an aluminum source, an alkali source, a non-essential ammonium salt and / or sylvite for 2 to 15min; feeding the ground powder into a reaction flask; heating for 2 to 60 minutes through a microwave oven to quickly crystallize the reaction mixture to synthesize the zeolite molecular sieve; and processing the zeolite molecular sieve by washing, filtering and drying to obtain the finished zeolite molecular sieve, wherein the molar ratio range of the reaction mixture fed is shown as that Na2O: SiO2: Al2O3: H2O: NH<4+> / K<+> =(0.2-8.5): (1-10.5): 1: (7-95): (0-5). With the adoption of the method, the unification of green and economy is realized, the production cost is decreased, the yield of single kettle is increased, and the production cycle is greatly reduced; and the most important is that the method is applicable to quick and high-yield synthesis of A type, X type and AX type detergent builder zeolite molecular sieves.

Description

technical field [0001] The invention belongs to the technical field of zeolite molecular sieve synthesis, and in particular relates to a method for rapidly synthesizing zeolite molecular sieves by combining a microwave method and a solid-phase method. Background technique [0002] Zeolite molecular sieves are widely used in adsorption separation, catalysis, ion exchange and other fields due to their regular pore structure, large specific surface area and pore volume. Since the 1960s, artificially synthesized zeolite molecular sieves (such as A-type, X-type, Y-type and L-type zeolite molecular sieves) have been widely used as adsorbents and catalysts. Especially A-type, X-type and AX-type zeolite molecular sieves, because these low-silica zeolite molecular sieves have a low silicon-alumina ratio (SiO 2 / Al 2 o 3 ≤1.5) and larger pore volume, more cations in the balanced skeleton charge, so it has a higher ion exchange capacity, so it is used in detergent additives, and the...

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Problems solved by technology

[0004] In the synthesis process of nano-zeolite molecular sieves, organic templates need to be added during the traditional solvothermal synthesis of nano-zeolites. For example, nano-type A and X-type zeolite molecular sieves are usually synthesized under the condition of adding alkylamines, but the cost of organic templates is high. Moreover, environmental pollution will be generated during roasting, which is not conducive to industrial production; when nano-zeolite molecular sieves are synthesized without using organic templates, longer gel aging time is often used to induce more crystal nuclei, which ultimately makes the synthesis cycle longer.

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