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Method for preparing low-silicon Na-A/X cocrystallization zeolite in pure sodium aluminosilicate system

A pure sodium aluminosilicate and co-crystallization technology, which is applied in the directions of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, fauhhedral crystalline aluminosilicate zeolite, etc., can solve the problem of low exchange capacity and X-type zeolite. The problem of high silicon-aluminum ratio

Inactive Publication Date: 2012-07-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the X-type zeolite synthesized by conventional methods has a relatively high silicon-aluminum ratio (usually SiO 2 / Al 2 o 3 >2.3), so its exchange capacity is low

Method used

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  • Method for preparing low-silicon Na-A/X cocrystallization zeolite in pure sodium aluminosilicate system
  • Method for preparing low-silicon Na-A/X cocrystallization zeolite in pure sodium aluminosilicate system
  • Method for preparing low-silicon Na-A/X cocrystallization zeolite in pure sodium aluminosilicate system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Main raw materials and reagents used: water glass (wherein the content of active ingredient is SiO 2 26.79wt%, Na 2 O 10.62wt%), sodium aluminate (wherein the content of active ingredient is Al 2o 3 43.3 wt%, Na 2 O 40.35wt%), sodium hydroxide (analytical grade, purity 96wt%).

[0022] A. Synthesis of activated silicon source:

[0023] Weigh 6.42 g of NaAlO 2 Dissolve in 85.16 g of deionized water and stir for 10 minutes until clear. Add 18.18 g of solid NaOH and stir for 10 minutes to prepare a perbasic sodium aluminate solution, which will be used when the temperature drops to room temperature. Weigh 24.00 grams of water glass, add 24.49 grams of the above prepared peralkali sodium aluminate solution dropwise into the weighed water glass, stir while adding, and then stir for 10 minutes after adding. Sealed and static aged at room temperature (25° C.) for 24 hours to prepare an activated silicon source. The molar ratio of the final reaction mixture is: NaO 2...

Embodiment 2

[0028] The materials and reagents used are the same as in Example 1; the preparation and aging method of the activated silicon source are the same as in Example 1.

[0029] Weigh out 1.25 g of NaAlO 2 Dissolve in 27.18 g of deionized water, stir for 10 minutes to dissolve, add 0.33 g of solid NaOH, stir to dissolve, and make a low-alkali sodium aluminate solution. Weigh 6.29 g of the above-prepared activated silicon source, slowly add the prepared low-alkali sodium aluminate solution into the weighed activated silicon source, stir while adding, and then stir for 30 minutes after the addition. The reaction mixture was poured into a reaction kettle for crystallization, and the crystallization condition was 90° C. for 6 hours. The molar ratio of the reaction mixture is: NaO 2 :Al 2 o 3 : SiO 2 :H 2 O=4.0:1:2.5:300.

[0030] The product was analyzed by X-ray diffraction to be Na-A / X co-crystallized zeolite, wherein the proportion of A-type zeolite was 38wt%, and X-type zeol...

Embodiment 3

[0032] The materials and reagents used are the same as in Example 1; the preparation and aging method of the activated silicon source are the same as in Example 1.

[0033] Weigh 5.81 g of NaAlO 2 Dissolve in 127.8 g of deionized water, stir for 10 minutes to dissolve, add 1.54 g of solid NaOH, stir to dissolve, and make a low-alkali sodium aluminate solution. Weigh 31.70 g of the above-prepared activated silicon source, slowly add the prepared low-alkali sodium aluminate solution into the weighed activated silicon source, stir while adding, and then stir for 30 minutes after the addition. The reaction mixture was poured into a reaction kettle for crystallization, and the crystallization condition was 10 hours at a temperature of 75°C. The molar ratio of the reaction mixture is: NaO 2 :Al 2 o 3 : SiO 2 :H 2 O=4.4:1:2.5:300.

[0034] The product was analyzed by X-ray diffraction to be Na-A / X co-crystallized zeolite, wherein the proportion of A-type zeolite was 14wt%, and...

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Abstract

The invention belongs to the technical field of zeolite molecular sieve synthesis and particularly relates to a method for preparing a low-silicon Na-A / X cocrystallization zeolite molecular sieve in a pure sodium aluminosilicate system. The method comprises the following two steps: preparing an activated silica source and synthesizing low-silicon Na-A / X cocrystallization zeolite. The method is characterized in that a potassium raw material is not used, and Na-A / X cocrystallization zeolite with low silicon and aluminum ratio is synthesized in the pure sodium aluminosilicate system. As the potassium raw material is not used, not only is the production cost is reduced, but also the bad effect of potassium ions left in the zeolite on the ion exchange performance is avoided. The silicon and aluminum ratio (SiO2 / Al2O3) of the Na-A / X cocrystallization zeolite synthesized by the method is 2.0-2.2 and is lower than that of the reported A / X cocrystallization zeolite. With the adoption of the method, the proportion of zeolite A to zeolite X in the Na-A / X cocrystallization zeolite can be adjusted and changed through changing the synthesis conditions to adapt to the softening demands of hard water with different Ca2+ and Mg2+ contents in different areas.

Description

technical field [0001] The invention belongs to the technical field of zeolite molecular sieve synthesis, and in particular relates to a method for preparing low-silicon Na-A / X co-crystallized zeolite molecular sieves in a pure sodium aluminosilicate system. Background technique [0002] In the past ten years, it has been found that the co-crystallized zeolite of two different types of zeolite produced in the same reaction system at one time (some people are also called mixed crystal zeolite or composite zeolite) has special properties, which are different from those obtained by mechanical mixing. their physical mixture. For example: ZSM-5 / ZSM-11 co-crystal zeolite, MCM-49 / ZSM-5 co-crystal zeolite, MCM-22 / ZSM-5 co-crystal zeolite (Fuel Proceesing Technology, 2006, 87, 297~302; Chinese Journal of Catalysis, 2010, 31(8), 1071~1076; Catalysis Letters, 2005, 103(3-4), 211~218) and FAU / LTA co-crystallized zeolite (Sci.Technol.Adv .Mater., 2009, 10, 1~8), etc. have special catal...

Claims

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Application Information

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IPC IPC(8): C01B39/14C01B39/22
Inventor 王润伟李守贵曾尚景
Owner JILIN UNIV
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