Method for rapidly synthesizing nanometer 3A molecular sieve

A molecular sieve and nano-technology, which is applied in the field of rapid synthesis of nano-3A molecular sieves, can solve the problems of high process cost, high-temperature calcination, and large energy loss, and achieve the effects of simple reaction procedures, high product purity, and low price

Inactive Publication Date: 2012-08-08
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although the synthesis of 3A molecular sieve by this method has a simple reaction procedure, high tempe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Weigh 40.0g sodium hydroxide, 16.8g potassium hydroxide and 138.6g potassium silicate respectively, mix the three and dissolve them in 270ml water, then weigh 70.2g aluminum hydroxide and add to the mixture and stir until it is fully After dissolving, heat to 95°C in the reaction kettle for constant temperature crystallization, weigh 62.4g of aluminum hydroxide and 42.0g of amorphous silicon dioxide at the same time, add them to the mixed solution evenly for 0.5-1h under stirring, and Constant temperature crystallization at 95°C for 2 hours, the crystallized product was filtered and dried to obtain a nanometer 3A molecular sieve product with an average particle size of 120nm.

example 2

[0028] Weigh 40.0g sodium hydroxide, 22.4g potassium hydroxide and 154.0g potassium silicate respectively, mix the three and dissolve them in 390ml water, then weigh 78.0g aluminum hydroxide and add to the mixed solution and stir until fully After dissolving, heat to 90°C in the reaction kettle for constant temperature crystallization, weigh 61.6g of aluminum hydroxide and 39.5g of amorphous silicon dioxide at the same time, add them to the mixed solution evenly for 0.5-1h under stirring, and Constant temperature crystallization at 90°C for 2.5 hours, the crystallized product was filtered and dried to obtain a nanometer 3A molecular sieve product with an average particle size of 190nm.

example 3

[0030] Weigh 40.0g of sodium hydroxide, 22.4g of potassium hydroxide and 169.4g of potassium silicate respectively, mix the three and dissolve them in 330ml of water, then weigh 85.8g of aluminum hydroxide and add to the mixture and stir until fully After dissolving, heat to 87°C in the reaction kettle for constant temperature crystallization, weigh 54.6g of aluminum hydroxide and 36.0g of amorphous silicon dioxide at the same time, add them to the mixed solution evenly for 0.5~1h under stirring, and Constant temperature crystallization at 87°C for 3.0 hours, the crystallized product was filtered and dried to obtain a nanometer 3A molecular sieve product with an average particle size of 280nm.

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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...

Claims

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Application Information

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IPC IPC(8): C01B39/14
Inventor 李小忠吕妍郜雪媒蓝阳丰
Owner ZHEJIANG NORMAL UNIVERSITY
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