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Ion exchange method for preparing lithium type low silicon aluminum X-shape zeolite molecular sieve

A zeolite molecular sieve and ion exchange technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problems that the impact has not been well resolved, few applications and reports, and harsh exchange conditions. To achieve the effect of overcoming uneven exchange, process simplification, and high exchange degree

Inactive Publication Date: 2008-02-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent USP5916836 (1999) once reported that Li-LSX type zeolite molecular sieve with exchange rate up to 97% has been obtained by this method, but the shortcoming of this method such as the influence of high temperature on solvent etc. has not all been solved well, and exchange condition is relatively Harsh and unevenly exchanged, so less applied and less reported

Method used

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  • Ion exchange method for preparing lithium type low silicon aluminum X-shape zeolite molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Take 5g of activated Na-LSX zeolite molecular sieve, mix it with 100ml of LiCl solution with a concentration of 0.4mol / L, place it in a water bath at 90°C for 2 hours, then filter it with suction and wash it. The obtained sample was re-added to 100 ml of the above LiCl solution for a second exchange. After the end, the sample was dried at 100°C for 2 hours and fired at 450°C for 1 hour.

[0019] Weigh the above 2g molecular sieve sample, mix it with 0.156g LiCl solid, stir it evenly and put it into the muffle furnace. Raise the temperature to 200°C at a speed of 2°C / min, and keep the temperature constant for 2 hours; then rise to 300°C at a speed of 4°C / min, and keep the temperature constant for 5 hours, take out the sample, wash and filter, and keep the sample at 150°C for 6 hours at a constant temperature After natural cooling, a Li-LSX zeolite molecular sieve sample with an exchange degree of 98% was obtained.

Embodiment 2

[0021] Take 5g of activated Na-LSX zeolite molecular sieve, mix it with 100ml of LiCI solution with a concentration of 0.4mol / L, place it in a water bath at 90°C for 2 hours, then filter it with suction and wash it. The obtained sample was re-added to 100 ml of the above LiCl solution for a second exchange. After the end, the sample was dried at 100°C for 2 hours and fired at 450°C for 1 hour.

[0022] Weigh the above 2g molecular sieve sample, mix it with 0.156g LiCl solid, stir it evenly and put it into the muffle furnace. Heat up to 200°C at a speed of 2°C / min, and keep the temperature constant for 2 hours; then rise to 400°C at a speed of 4°C / min, keep the temperature at 3 hours, take out the sample, wash and filter, and keep the sample at 150°C for 6 hours After natural cooling, a Li-LSX zeolite molecular sieve sample with an exchange degree of 98% was obtained.

Embodiment 3

[0024] Take 5g of activated Na-LSX zeolite molecular sieve, mix it with 100ml of LiCl solution with a concentration of 0.4mol / L, place it in a water bath at 90°C for 2 hours, then filter it with suction and wash it. The obtained sample was re-added to 100 ml of the above LiCl solution for a third exchange. After the end, the sample was dried at 100°C for 2 hours and fired at 450°C for 1 hour.

[0025] Weigh the above 2g molecular sieve sample, mix it with 0.052g LiCl solid, stir it evenly, put it into the muffle furnace, set the temperature program as follows: under room temperature, raise the temperature to 120°C at a speed of 1°C / min, and keep the temperature constant for 2 hours; Raise the temperature to 200°C at a speed of 2°C / min, and keep the temperature constant for 2 hours; then raise it to 350°C at a speed of 4°C / min, keep the temperature at 3 hours, take out the sample, wash and filter, and keep the sample at 150°C for 6 hours at a constant temperature After natural...

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Abstract

An ion exchange method for preparing lithium low-silicon low-aluminum X-type zeolite molecule sieve pertains to microporous material technique field. The invention is characterized in that: firstly, a sodium low-silicon low-aluminum X-type zeolite molecule sieve (Na-LSX) is endowed with a certain Li-ion exchange degree through the exchange of Li-ion water solution, then the lithium low-silicon low-aluminum X-type zeolite (Li-LSX) is obtained through a solid phase exchange method, and the Li-ion exchange degree of the final product is larger than 96 percent. Compared with the traditional ion exchange method, the method has the advantages of low cost, simple technique and thorough exchange, etc., and the prepared Li-LSX type zeolite molecule sieve has wide universal application potentials in the field of the fine chemical and absorption exchange, etc.

Description

Technical field: [0001] The invention belongs to the technical field of microporous materials, and in particular relates to a lithium ion exchange method for a sodium-type low-silicon-alumina X-type zeolite molecular sieve. Background technique: [0002] X-type zeolite molecular sieves with a silicon-aluminum ratio of 1.0-1.1 are called low-silicon-aluminum X-type zeolite molecular sieves (LSX). According to reports, since Li + The radius is the smallest and the charge density is the largest, compared to Na + , Ca 2+ , Mg 2+ Plasma zeolite molecular sieve, LiX zeolite molecular sieve has good oxygen-enrichment performance, and its adsorption capacity for nitrogen is more than 50% higher than that of ordinary X-type zeolite molecular sieve, while Li-LSX zeolite molecular sieve has a larger capacity than ordinary X-type zeolite molecular sieve. Nitrogen adsorption capacity and nitrogen-oxygen separation ability (USP5268023, 1993), thus showing superiority in gas separation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/22
Inventor 孙继红刘宗昉
Owner BEIJING UNIV OF TECH
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