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A kind of method that uses na2co3 to assist in synthesizing low-silicon-aluminum ratio x-type molecular sieves

A low-silicon-aluminum ratio, molecular sieve technology, applied in crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of small variation range of water-base ratio, large preparation difficulty, and narrow molecular sieve formula synthesis range. , to broaden the synthesis range, reduce the difficulty of production, and achieve the effect of fine modulation

Active Publication Date: 2018-03-16
TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of small variation range of water-alkali ratio in X-type molecular sieve ratio with low silicon-aluminum ratio, narrow molecular sieve formula synthesis range, and high difficulty in preparation. To solve the above problems, the present invention provides a method using Na 2 CO 3 Auxiliary method for synthesizing X-type molecular sieves with low silicon-aluminum ratio

Method used

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  • A kind of method that uses na2co3 to assist in synthesizing low-silicon-aluminum ratio x-type molecular sieves
  • A kind of method that uses na2co3 to assist in synthesizing low-silicon-aluminum ratio x-type molecular sieves
  • A kind of method that uses na2co3 to assist in synthesizing low-silicon-aluminum ratio x-type molecular sieves

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] One uses Na 2 CO 3 The method for assisting in the synthesis of X-type molecular sieves with a low silicon-aluminum ratio specifically comprises the following steps:

[0031] (1) Preparation of directing agent

[0032] 1.382g sodium aluminate solid (Al 2 o 3 0.0056mol, Na 2 (0.0078mol), 6.396g sodium hydroxide (0.0768mol) were added in 18.6ml deionized water to obtain a high alkalinity sodium aluminate solution, and then 6.4ml sodium silicate solution (SiO 2 0.032mol, Na 2 O 0.01mol) was slowly added into the high alkalinity sodium aluminate solution, stirred at room temperature for 0.5h, and aged at 25°C for 9h to become the directing agent. Na 2 O:SiO 2 :Al 2 o 3 :H 2 O=0.0946:0.032:0.0056:1.3889=17:5.76:1:250, wherein the calculation of the amount of water is: (6.4+18.6) / 18=1.3889mol.

[0033] (2) Use Na 2 CO 3 Auxiliary Synthesis of Raw Powder of X-type Molecular Sieve with Low Si-Al Ratio

[0034] 2.488g sodium aluminate (Al 2 o 3 0.0100mol, Na ...

Embodiment 2

[0037] One uses Na 2 CO 3 The method for synthesizing low-silicon-aluminum ratio X-type molecular sieves specifically comprises the following steps:

[0038] (1) Preparation of directing agent

[0039] Under stirring conditions, add 1.382g sodium aluminate solid and 6.396g sodium hydroxide to 18.6ml deionized water in turn to obtain a high alkalinity sodium aluminate solution, then slowly add 6.4ml sodium silicate solution to high alkalinity sodium aluminate In the solution, stir at room temperature for 0.5h, and then stand and age at 25°C for 10h to become the directing agent.

[0040] (2) Use Na 2 CO 3 Auxiliary Synthesis of Raw Powder of X-type Molecular Sieve with Low Si-Al Ratio

[0041] 2.488g sodium aluminate (Al 2 o 3 0.0100mol, Na 2 (0.0140mol), 4.559g anhydrous sodium carbonate (Na 2 CO 3 0.0429mol, Na 2 (0.0429mol), 1.893g solid sodium hydroxide (Na 2 (00.0227mol), 3.099g solid potassium hydroxide (K 2 O 0.0235mol) add 19.8ml deionized water (H 2 O 1...

Embodiment 3

[0044] One uses Na 2 CO 3 The method for synthesizing low-silicon-aluminum ratio X-type molecular sieves specifically comprises the following steps:

[0045] (1) Preparation of directing agent

[0046] Under stirring conditions, add 1.382g sodium aluminate solid and 6.396g sodium hydroxide to 18.6ml deionized water in turn to obtain a high alkalinity sodium aluminate solution, then slowly add 6.4ml sodium silicate solution to high alkalinity sodium aluminate In the solution, stir at room temperature for 0.5h, and then stand and age at 30°C for 8h to become the directing agent.

[0047] (2) Use Na 2 CO 3 Auxiliary Synthesis of Raw Powder of X-type Molecular Sieve with Low Si-Al Ratio

[0048] Under stirring conditions, 2.488g of sodium aluminate, 4.129g of anhydrous sodium carbonate, 1.554g of solid sodium hydroxide, and 3.059g of solid potassium hydroxide were stirred until they were completely dissolved, and then 3.83ml of sodium silicate solution was slowly added. Stir...

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Abstract

The invention relates to the technical field of preparation of inorganic material-molecular sieve powder, and aims to provide a method for extending the synthesis range of a low-silicon-aluminum-ratio X type molecular sieve. The method is specifically a method for synthesizing the low-silicon-aluminum-ratio X type molecular sieve under the assistance of Na2CO3, and comprises the following steps: (1) preparing a directing agent: adding a silicon source into an aluminum source, an alkali source and water to prepare the directing agent; (2) synthesizing X type molecular sieve raw powder under the assistance of the Na2CO3. According to the method, the low-silicon-aluminum-ratio X type molecular sieve synthesized under the assistance of the Na2CO3 is of a pure phase and is relatively high in crystallinity; the adopted raw material Na2CO3 is an industrial raw material which is relatively low in corrosiveness, low-cost, readily available and suitable for large-scale production and application; particularly, the raw material Na2CO3 is relatively poor in alkalinity, the alkalinity can be kept stable within a wider synthesis proportioning operation range, and the alkalinity of a reaction system can be finely regulated.

Description

technical field [0001] The invention relates to the technical field of inorganic material-molecular sieve powder preparation, specifically a method using Na 2 CO 3 A method for assisting in the synthesis of X-type molecular sieves with a low silicon-aluminum ratio. Background technique [0002] X-type molecular sieve with low silicon-aluminum ratio is a molecular sieve with a cubic faujasite structure, and the silicon-aluminum ratio n(SiO 2 ) / n(Al 2 o 3 ) = 2.0 ~ 2.2. X-type molecular sieve with low silicon-aluminum ratio passed through Li + Li-LSX molecular sieve with high exchange degree has larger nitrogen adsorption capacity and nitrogen-oxygen separation coefficient, better adsorption performance, and is currently the most ideal adsorbent in pressure swing adsorption air separation and oxygen generation technology; in addition, Due to the n(SiO 2 ) / n(Al 2 o 3 ) is low, the exchangeable cationic position increases and may even reach the maximum value, and its pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/22
CPCC01B39/22C01P2002/72C01P2004/03
Inventor 李玉平贾坤张翊李晓峰窦涛
Owner TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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