Method for rapidly synthesizing nanometer 3A molecular sieve

Abstract

The invention discloses a method for rapidly synthesizing a nanometer 3A molecular sieve. The method is implemented in a way that aluminum hydroxide, sodium hydroxide, potassium hydroxide, potassium silicate and amorphous silicon dioxide are taken as raw materials for synthesizing the nanometer 3A molecular sieve. The method for synthesizing the nanometer 3A molecular sieve comprises the following steps of: dissolving an aluminum hydroxide solid into a mixed solution of sodium hydroxide, potassium hydroxide and potassium silicate; heating and crystalizing while stirring, wherein the alkalinity of the solution is gradually increased along with crystallization; adding aluminum hydroxide and amorphous silicon dioxide for reacting with an alkali; continually crystalizing a product; and filtering and drying a crystallization product to obtain a nanometer 3A molecular sieve product. The method has the characteristics that: (1) the reaction program and process flow are simple, and the synthesis time is short; (2) the raw material utilization ratio is high, and the prepared 3A molecular sieve has low pH value and is not required to be washed; and (3) the prepared nanometer 3A molecular sieve has the advantages of high product purity, large specific surface area, high selective adsorption performance and the like, and has low price.

Description

technical field [0001] The invention relates to a method for synthesizing 3A molecular sieves, in particular to a method for rapidly synthesizing nanometer 3A molecular sieves. Background technique [0002] KA type molecular sieve, its effective pore size is 0.30~0.33nm, can absorb molecules with a diameter smaller than 3A into the cavity of the molecular sieve, and play the role of sieving molecules. It is commercially called 3A type molecular sieve, which belongs to the alkali of potassium crystal structure. Metal aluminosilicate, a kind of microporous compound with regular and uniform microporous channel structure. Because the crystal holes and channels in the crystal communicate with each other, the volume of the holes accounts for more than 50% of the molecular sieve crystal volume, which has a very large specific surface area, and its surface has a high degree of polarity due to the characteristics of the ionic lattice, so it has a relatively high molecular weight. Hi...

AI Technical Summary

Problems solved by technology

Although the synthesis of 3A molecular sieve by this method has a simple reaction procedure, high temperature calcination is required, the energy loss is very large, and the process cost is relatively high.