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Preparation method of molecular sieve, hollow glass desiccant with low nitrogen adsorption and preparation method thereof

A nitrogen adsorption and molecular sieve technology, applied in the field of molecular sieves, can solve the problems of inability to apply insulating glass and reduce production costs, and achieve the effect of reducing load and improving product whiteness

Active Publication Date: 2022-12-02
内蒙古超牌新材料股份有限公司
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Problems solved by technology

[0007] The invention provides a method for preparing molecular sieves, a low-nitrogen adsorption hollow glass desiccant and a method for preparing the same, making full use of discarded coal-based kaolin, reducing production costs, and solving the problem that 4A molecular sieves in the prior art absorb a large amount of nitrogen, which cannot be applied to Technical problems in insulating glass

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  • Preparation method of molecular sieve, hollow glass desiccant with low nitrogen adsorption and preparation method thereof
  • Preparation method of molecular sieve, hollow glass desiccant with low nitrogen adsorption and preparation method thereof
  • Preparation method of molecular sieve, hollow glass desiccant with low nitrogen adsorption and preparation method thereof

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preparation example Construction

[0033] like figure 1 As shown, the preparation method of the molecular sieve of the present embodiment comprises the following steps:

[0034] S1. The ground coal-based kaolin is mixed with the first lye, heated for pre-decarburization, and the reaction slurry is obtained after the reaction;

[0035] S2, filtering the reaction slurry in step S1 to obtain filtrate and filter cake respectively, the filtrate is used to produce humate, and the retained material after filtration is compressed to form a filter cake;

[0036] S3, drying and calcining the filter cake in step S2 to obtain metakaolin;

[0037] S4. Mix the metakaolin in step S3 with the second lye, gel and crystallize, then filter, wash and dry to obtain molecular sieves.

[0038](1) In the preparation method of the molecular sieve of the present invention, under normal circumstances, people explore the factors that affect the whiteness mainly as iron and titanium impurities in kaolin, but they often ignore that coal-b...

Embodiment 1

[0058] The preparation method of molecular sieve comprises the following steps:

[0059] S1, the coal-based kaolin is ground through a 325-mesh sieve, mixed with 10% potassium hydroxide solution, the mass ratio of potassium hydroxide in the potassium hydroxide solution to the coal-based kaolin is 10: 100, heated for pre-decarburization, The heating temperature is 80°C, the heating time is 2h, and the reaction slurry is obtained after the reaction;

[0060] S2, filtering the reaction slurry in step S1 to obtain filtrate and filter cake respectively, the filtrate is used to produce potassium humate, and the retained material after filtration is compressed to form a filter cake;

[0061] S3, drying the filter cake in step S2, and calcining at 800° C. for 2 hours to obtain metakaolin, which is amorphous Al 2 o 3 ·SiO2 2 ;

[0062] S4. Mix the metakaolin in step S3 with 15% sodium hydroxide solution, the molar ratio of sodium hydroxide and metakaolin in the sodium hydroxide sol...

Embodiment 2

[0065] S1. Grind coal series kaolin to 1250 mesh, mix with 10% ammonia water, the mass ratio of ammonia in ammonia water to coal series kaolin is 10:100, heat for pre-decarburization, the heating temperature is 80°C, and the heating The time is 2h, and reaction slurry is obtained after the reaction;

[0066] S2, filtering the reaction slurry in step S1 to obtain filtrate and filter cake respectively, the filtrate is used to produce ammonium humate, and the retained material after filtration is compressed to form a filter cake;

[0067] S3, drying the filter cake in step S2, and calcining at 830° C. for 2 hours to obtain metakaolin, which is amorphous Al 2 o 3 ·SiO2 2 ;

[0068] S4, mix the metakaolin in step S3 with 6% sodium hydroxide solution, the molar ratio of sodium hydroxide and metakaolin in the sodium hydroxide solution is 7:1, gelatinize at 60° C. for 3 hours, and gel at 95 Crystallize at ℃ for 3 hours, filter, wash, and dry to obtain molecular sieves with a white...

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Abstract

The preparation method of the molecular sieve of the present invention, the low -nitrogen adsorption hollow glass desiccant and its preparation methods, including the following steps: S1, the grinding coal system is mixed with the first alkali liquid, the heating is heated, the reaction is pre -decarburized.Reacting slurry; s2, filter the reaction slurry in the step s1, obtain the filter fluid and filter cake respectively, the filter liquid is used to produce humic acid, and the filter is formed after filtering.Cake drying and burning, obtain a polarized high mountain; S4, mix the high mountains in step S3 with the second base fluid, glue, crystallize, then filter, wash, and dry the molecular sieve.The present invention uses alkali and coal -based kaolin to pre -reacts to pre -decarbon to remove some carbonized compounds, that is, it can increase the whiteness of the product and reduce the load for subsequent burns.

Description

technical field [0001] The invention relates to the field of molecular sieves, in particular to a method for preparing molecular sieves with low nitrogen adsorption. In addition, the invention also relates to a hollow glass desiccant with low nitrogen adsorption and a preparation method thereof. Background technique [0002] Desiccant is the basic raw material for making insulating glass. It is used to absorb the moisture in the hollow glass cavity and prevent water vapor condensation, solvent fog, frosting, etc. on the glass surface inside the insulating glass. During the manufacturing process of insulating glass, the air containing water is sealed in the hollow glass cavity. When the insulating glass is installed on the building, the glass surface temperature changes with the ambient temperature. When the temperature is lower than the dew point of the air in the insulating glass, Condensation will occur. If no desiccant is used, even in the hot summer, due to the large t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/18B01J20/18B01J20/30B01D53/02B01D53/28
CPCC01B39/18B01J20/186B01D53/02B01D53/261B01D53/28C01P2006/60
Inventor 陈建文王星宇冯英
Owner 内蒙古超牌新材料股份有限公司
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