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Modified X-type molecular sieve with low silica-alumina ratio, and preparation method and application thereof

A low-silicon-aluminum ratio, molecular sieve technology, applied in molecular sieves and alkali exchange compounds, separation methods, aluminum silicate and other directions, can solve the problems of high and low temperature rectification methods with energy consumption, reduce energy consumption, increase Ar adsorption capacity, The effect that is conducive to the sustainable development of the economy

Active Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high energy consumption is the main reason restricting the development of cryogenic distillation.

Method used

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  • Modified X-type molecular sieve with low silica-alumina ratio, and preparation method and application thereof
  • Modified X-type molecular sieve with low silica-alumina ratio, and preparation method and application thereof
  • Modified X-type molecular sieve with low silica-alumina ratio, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) 31.4g NaAlO 2 Dissolved in 340.5 g deionized water, 68.5 g NaOH and 35.4 g KOH were added while stirring. Stir until the solid is completely dissolved and cool to room temperature, slowly add 84.2 g of silica sol with a mass fraction of 30% under rapid stirring, and continue stirring for 1 hour. The mixed solution was transferred to a three-necked flask, and placed in a water bath with a set temperature of 85° C. and mechanically stirred for 24 hours. After the reaction was completed, the temperature was naturally lowered to room temperature, and the solid product was separated by vacuum filtration, and washed with a large amount of deionized water until the pH of the filtrate was less than 8. The product was dried at 100° C. for 12 hours to obtain a white powder.

[0037] (2) Weigh 1g of molecular sieve raw powder into a round bottom flask, add 17ml of 1mol / L FeCl 3 The solution was ion-exchanged under the conditions of heating in a water bath at 85° C. and magn...

Embodiment 2

[0040] (1) 31.4g NaAlO 2 Dissolved in 340.5 g deionized water, 68.5 g NaOH and 35.4 g KOH were added while stirring. Stir until the solid is completely dissolved and cool to room temperature, slowly add 84.2 g of silica sol with a mass fraction of 30% under rapid stirring, and continue stirring for 1 hour. The mixed solution was transferred to a three-necked flask, and placed in a water bath with a set temperature of 85° C. and mechanically stirred for 24 hours. After the reaction was completed, it was naturally cooled to room temperature, and the solid product was separated by vacuum filtration, and washed with a large amount of deionized water until the pH of the filtrate was less than 8. The product was dried at 100° C. for 12 hours to obtain a white powder.

[0041] (2) Weigh 1g of molecular sieve raw powder into a round bottom flask, add 20ml of 0.5mol / L LaCl 3 and CeCl 3 The mixed solution was ion-exchanged under the conditions of heating in a water bath at 85° C. an...

Embodiment 3

[0044] (1) 31.4g NaAlO 2 Dissolved in 340.5 g deionized water, 68.5 g NaOH and 47.1 g KCl were added while stirring. Stir until the solid is completely dissolved and cool to room temperature, slowly add 84.2 g of silica sol with a mass fraction of 30% under rapid stirring, and continue stirring for 1 hour. The mixed solution was transferred to a three-necked flask, and placed in a water bath with a set temperature of 85° C. and mechanically stirred for 24 hours. After the reaction was completed, it was naturally cooled to room temperature, and the solid product was separated by vacuum filtration, and washed with a large amount of deionized water until the pH of the filtrate was less than 8. The product was dried at 100° C. for 12 hours to obtain a white powder.

[0045] (2) Weigh 1g of molecular sieve raw powder into a round bottom flask, add 17ml of 1mol / L CaCl 2 The solution was ion-exchanged under the conditions of heating in a water bath at 85° C. and magnetic stirring,...

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Abstract

The invention relates to a modified X-type molecular sieve with a low silica-alumina ratio, and a preparation method and application thereof, belonging to the field of preparation of molecular-sieve cellular materials. The molecular sieve is an inorganic porous material prepared by alternately assembling silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons; an X-type molecular sieve with high purity, high crystallinity and a low silica-alumina ratio is prepared by using a normal pressure reflux stirring process; then an ion exchange modification process is employed to prepare a low-silicon X-type molecular sieve containing at least two metal ions selected from a group consisting of Fe<3+>, Ce<3+>, La<3+>, Ca<2+>, Li<+> and Ag<+>; and then surface modification is carried out to makemolecular sieve to have higher hydrophobic properties. The modified X-type molecular sieve has excellent oxygen-nitrogen-argon separation performance and is applicable to preparation of high-purity oxygen. The preparation method has the advantages of simple process flow, easiness in scaling-up, etc.

Description

technical field [0001] The invention belongs to the preparation of molecular sieve microporous materials and their application to N 2 / O 2 The technical field of / Ar mixed gas separation, specifically relates to low-silicon-aluminum ratio X-type molecular sieves and their preparation methods and applications. Background technique [0002] Energy and environmental issues are two issues that are closely related to sustainable economic development today. Energy saving and consumption reduction has always been the task and mission of the chemical industry. Nitrogen and oxygen are important chemical raw materials. High-purity oxygen is widely used in the fields of iron and steel industry, chemical industry, medical care, papermaking and sewage treatment; high-purity nitrogen is mainly used as sealing gas, purge gas and protective gas for food processing. The efficient and cost-effective separation of high-purity nitrogen and oxygen from air is of great commercial value. At pr...

Claims

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Application Information

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IPC IPC(8): C01B39/22B01J20/16B01J20/30B01D53/02
CPCB01D53/02B01D2253/106B01D2257/102B01D2257/104B01D2257/11B01J20/16C01B39/026C01B39/22C01P2002/72C01P2004/01C01P2006/12C01P2006/14C01P2006/17
Inventor 王树东郭亚孙天军赵生生乌荣光
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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