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Zeolite molecular sieve and its prepn process with palygorskite as material

A technology of zeolite molecular sieve and palygorskite, applied in molecular sieve catalysts, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problems of small application range, low resource utilization rate, diversification, and low degree of serialization , to achieve the effect of low price and wide source

Inactive Publication Date: 2007-11-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with developed countries, the utilization rate of this resource is low, the scope of use is small, and the degree of diversification and serialization of product development is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Analcime was prepared from palygorskite in Xuyi, Jiangsu Province, and the raw material Si:Al≈2.14.

[0029] 1) Take 5 kilograms by weighing, separate and purify, and crush to 300 mesh palygorskite with 5 times the weight, mix with a 30% sodium hydroxide solution, stir evenly, and obtain a suspension slurry;

[0030] 2) moving the above-mentioned suspension slurry into a sealed reaction kettle, and reacting at 120°C for 6 hours to obtain a slurry containing zeolite powder;

[0031] 3) The above slurry containing zeolite powder is dehydrated by sedimentation, centrifugation or press filtration, washed with water for 3 times, dried at 80° C., and ground to 100 mesh to obtain zeolite powder. According to XRD analysis, the obtained product is analcime.

Embodiment 2

[0033] The 4A zeolite was prepared from palygorskite in Xuyi, Jiangsu Province, and the raw material Si:Al≈2.14.

[0034] 1) Take 5 kg by weighing, separate and purify, and crush to 400 mesh palygorskite with 20 times the weight, and mix with 5% sodium hydroxide solution, then add 1% sodium aluminate by weight ratio, stir evenly, Obtain a suspension slurry;

[0035] 2) moving the suspension slurry into a sealed reaction kettle, and reacting at 200° C. for 12 hours to obtain a slurry containing zeolite powder;

[0036] 3) Dehydrate the above-mentioned slurry containing zeolite powder by sedimentation, centrifugation or pressure filtration, wash it with water for 3 times, dry it naturally, or dry it at 70°C, and grind it to 200 mesh to obtain zeolite Powder. According to XRD analysis, the obtained product is 4A type zeolite.

Embodiment 3

[0038] The 4A zeolite was prepared from palygorskite in Xuyi, Jiangsu Province, and the raw material Si:Al≈2.14.

[0039] 1) Weigh 5 kg, separate and purify, and crush palygorskite to 400 mesh with 20 times the weight and mix with potassium hydroxide solution with a concentration of 5%, then add sodium metaaluminate with a weight ratio of 1.5%, and stir evenly , to obtain a suspension slurry;

[0040] 2) moving the suspension slurry into a sealed reaction kettle, and reacting at 200° C. for 12 hours to obtain a slurry containing zeolite powder;

[0041] 3) Dehydrate the above-mentioned slurry containing zeolite powder by sedimentation, centrifugation or pressure filtration, wash it with water for 3 times, dry it naturally, or dry it at 70°C, and grind it to 200 mesh to obtain zeolite Powder. According to XRD analysis, the obtained product is 4A type zeolite.

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PUM

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Abstract

The present invention discloses one kind of zeolite molecular sieve and its preparation process with palygorskite as material. The zeolite molecular sieve is prepared through reacting palygorskite and alkali solution in 5-20 times, and the subsequent washing and drying. The prepared zeolite molecular sieve has type controlled through altering the ratio between palygorskite and alkali solution. The process of preparing zeolite molecular sieve with palygorskite as material is simple.

Description

technical field [0001] The invention relates to a method for preparing zeolite molecular sieve by using palygorskite as raw material. Background technique [0002] The theoretical crystal chemical formula of palygorskite is: [0003] (Mg 5-y-z R y 3+ □ x )(Si 8-x R x 3+ )O 20 (OH) 2 (OH 2 ) 4 ·E 2+ (x-y+2z) / 2 (H 2 O) 4 [0004] where R 3+ on behalf of Al 3+ and Fe 3+ ; □ stands for octahedral vacancies; E 2+ stands for exchangeable cations. [0005] Zeolite is a hydrous aluminosilicate mineral whose general chemical formula is: [0006] m x / n [Al x Si y o 2(x+y) ]·mH 2 o [0007] where M is Na + 、K + , Ca 2+ , Mg 2+ , n is the valence state of M, x is between 1 and 10, y: x is between 1 and 5, and m is 1 to 5 times of x. The basic unit of zeolite crystal structure is silicon (aluminum) oxygen tetrahedron. The silicon-oxygen tetrahedrons are connected by oxygen bridges, showing multiple closed ring structures on the plane. Reg...

Claims

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Application Information

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IPC IPC(8): C01B39/02C01B39/14C01B39/26B01J29/06B01J29/18
Inventor 叶瑛张平萍陈雪刚夏枚生潘依雯李秀悌吕双双胡秀芳
Owner ZHEJIANG UNIV
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