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NaX zeolite molecular sieve and preparation method thereof

A technology of zeolite molecular sieve and dispersant, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc.

Inactive Publication Date: 2015-02-18
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the directly synthesized zeolite molecular sieve is a loose crystal powder, which is easy to be deactivated and aggregated into agglomerates during the actual storage process. During the application process, the dust is large, and a binder needs to be added to form it, so that the effective surface area of ​​​​the material is significantly reduced.

Method used

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  • NaX zeolite molecular sieve and preparation method thereof
  • NaX zeolite molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 1771 g spent catalyst fine powder, 276 g diatomaceous earth, 206 ml water glass, and 40 g sodium hydroxide, add water and stir evenly to make a slurry with a solid content of 50% by weight, and spray it to make a particle size concentrated in Microspheres of 0-150 μm were calcined at 1000 °C for 0.5 hours to obtain calcined microspheres;

[0029] (2) Add water to the roasted material obtained in step (1) and stir evenly to make a slurry, adjust the final pH value of the slurry to 3.0 with a mixture of 8 wt% tartaric acid and citric acid, raise the temperature to 90 °C, and react for 10 minutes. Afterwards, the mother liquor is removed by filtration, and the modified material is obtained by washing and filtering;

[0030] (3) Put 234 ml of sodium hydroxide, 53 ml of water glass water, 159 ml of water glass, and 200 g of modified materials into a stainless steel crystallization reaction kettle in a stirring state, raise the temperature to 120 ℃, and crystallize at...

Embodiment 2

[0033] (1) Add 852 g of spent catalyst, 497 g of diatomaceous earth, 48 g of sodium cellulose, 36 g of sodium carbonate, 125 ml of water glass, add water, grind in a ball mill for 2 h, and press into tablets on a tablet machine. The material is put into a muffle furnace and roasted at 700° C. for 10 hours to obtain a roasted material;

[0034] (2) Add water to the roasted material obtained in step (1), adjust the pH value of the end point of the system to 5.0 with 10% by weight tartaric acid, raise the temperature to 30 ° C, and react for 60 minutes. After the reaction is completed, filter to remove the mother liquor, wash and filter to obtain the modified material ;

[0035] (3) Put 417 ml of sodium hydroxide, 163 ml of water, and 100 g of modified materials into a stainless steel crystallization reaction kettle in turn under stirring, raise the temperature to 50 °C, and crystallize at a constant temperature for 40 hours. After the crystallization is completed, the mother li...

Embodiment 3

[0038] (1) Add water to 2438 g of spent catalyst, 621 g of diatomite, 217 ml of water glass, 90 g of potassium hydroxide, and 60 g of polyacrylamide, grind them in a ball mill for 2 hours, and extrude the strips on the extruder. Put the pellets into a muffle furnace, and roast them at 800°C for 4.5 hours to obtain a strip-shaped roasted material;

[0039] (2) Add water to the calcined material obtained in step (1), adjust the pH value of the end point of the system to 4.0 with 15 wt% nitric acid, raise the temperature to 60 °C, and react for 30 min. After the reaction is completed, filter to remove the mother liquor, wash and filter to obtain modified materials;

[0040] (3) Put 1522 ml of sodium hydroxide, 197 ml of water glass, 705 ml of water, and 500 g of modified materials into a stainless steel crystallization reaction kettle in turn under stirring, raise the temperature to 90 ℃, and crystallize at constant temperature for 10 hours. After the crystallization is completed,...

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Abstract

The invention relates to a NaX zeolite molecular sieve and a preparation method thereof. The preparation method is characterized by comprising the following steps: using a waste catalyst and diatomaceous earth as raw materials, adding water in the waste catalyst and the diatomaceous earth, stirring the waste catalyst, the diatomaceous earth and one or more of a dispersing agent, a pore-enlarging agent and an additive uniformly to prepare slurry, forming through extruding into strips, rolling into balls, tabletting or spray drying, roasting the formed material for 0.5-10 hours at 700-1,000 DEG C to obtain a roasted material, adding water in the roasted material, regulating the pH value of a system end point to 3.0-5.0 with an acid, then enabling reaction for 10-60 min at 30-90 DEG C, filtering to remove a mother liquid, washing, filtering to obtain a modified material, adding an alkali liquid and / or sodium silicate and water in the modified material to obtain a mixture, feeding the mixture in a crystallization reaction kettle, performing hydrothermal crystallization for 4-40 hours at 50-120 DEG C, filtering to remove the mother liquid, washing the filter material with deionized water, filtering, and drying the filter material to obtain the target product. The preparation method is low in preparation cost, solid wastes can be efficiently recycled and reused, and the product adsorption capacity is high.

Description

Technical field [0001] The present invention involves a NAX boiler molecule sieve and its preparation method. It is characterized by waste catalysts and diatomic soil as raw materials, and the NAX boiler molecular sieve is prepared by hydrophilic crystal synthesis.It belongs to the field of inorganic materials synthesis. Background technique [0002] Biite molecular sieve is an artificial synthetic silicon aluminate with a microporous cubic lattice.The molecules adsorbed or excluded according to the size of the internal hole of the crystal, and have good thermal and water heat stability while having good forming properties at the same time, and are widely used in catalytic and adsorption separation processes.Generally, the direct synthetic boiler molecular sieve is a loose crystal powder. In the actual storage procedure, the shortcomings that are easily lost and gathered into blocks. During the application process, the dust is large, and the bonding agent is required to make the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/22
CPCC01B39/22C01P2002/72
Inventor 郑淑琴唐课文易健民阎建辉任劭朱葳余红霞张建策
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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