Method for synthesizing aluminosilicate molecular sieve by seed crystal method

An aluminosilicate and molecular sieve technology, which is applied in the directions of crystalline aluminosilicate zeolite, mercerized crystalline aluminosilicate zeolite, iron conglomerate crystalline aluminosilicate zeolite, etc., can solve the problem of unfavorable industrial production and cannot completely avoid organic templates Use of drugs, etc.

Active Publication Date: 2019-12-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be said that, strictly speaking, the synthetic methods that have been researched or applied so far, even the "seed crystal method" that claims to replace organic templates, still cannot completely avoid the use of organic templates. Considering the amount of seed crystals used , even if the seed crystal synthesis technology (the present invention is referred to as conventional or traditional seed crystal method) is adopted, there is a certain distance between the real reduction of the production cost of synthetic aluminosilicate molecular sieves and the realization of green production, which is not conducive to Realize industrial production

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  • Method for synthesizing aluminosilicate molecular sieve by seed crystal method
  • Method for synthesizing aluminosilicate molecular sieve by seed crystal method
  • Method for synthesizing aluminosilicate molecular sieve by seed crystal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Adopt pseudo-solid-phase activation method to activate kaolin as crystal seed, and the preparation steps of seed crystal are as follows: mix kaolin and sodium hydroxide evenly according to the mass ratio of 1:1.2, add a certain amount of deionized water (the amount of water added accounts for 10% of the solid feed intake ) placed in the extruder and kneaded for about 10 minutes, then extruded to obtain a wet strip with a diameter of about 1.5mm, then put the wet strip in an oven at 150°C for about 3 hours, cooled the dried product to room temperature, crushed and sieved To below 300 mesh, made of kaolin activated by QSP.

[0081] Take by weighing 1.42g potassium hydroxide, dissolve with deionized water, stir until clear and transparent, add 1.23g sodium metaaluminate (Al 2 o 3 , 55wt.%), stirred until clear and transparent, then added 24.0g of silica sol (SiO 2 , 30wt.%), stirred vigorously for about 30min to obtain a reactant gel. The molar ratio (in terms of its ox...

Embodiment 2

[0088] The preparation method of the quasi-solid-phase activated kaolin seed crystal is the same as that of Example 1.

[0089] Take by weighing 1.42g potassium hydroxide, dissolve with deionized water, stir until clear and transparent, add 1.23g sodium metaaluminate (Al 2 o 3 , 55wt.%), stirred until clear and transparent, then added 24.0g of silica sol (SiO 2 , 30wt.%), stirred vigorously for 30min to obtain a reactant gel. The molar ratio of each component in the reactant gel (in terms of its oxides) is: 1.5Na 2 O:2.0K 2 O:20SiO 2 :1Al 2 o 3 :600H 2 O. Add 8.0wt.% (based on SiO in the reactant gel) in the reactant gel 2 The mass fraction of the total mass) of the quasi-solid-phase activated kaolin was used as the seed crystal, and the stirring was continued for about 30 minutes. The crystallization was carried out for 36 hours, and the rotation rate was controlled at 30-60 rpm during the crystallization process. After the crystallization, the obtained synthetic p...

Embodiment 3

[0092] The sub-molten salt activation method is used to activate kaolin as a seed crystal. The seed crystal preparation steps are as follows: mix kaolin, sodium hydroxide, and deionized water in a mass ratio of 1:1.5:6, and then place the mixture in an oven at 250 ° C. After drying for 3 hours, the dried product was cooled to room temperature, crushed and sieved to below 300 mesh to obtain sub-molten salt activated kaolin.

[0093] Take by weighing 1.89g potassium hydroxide, dissolve with deionized water, stir until clear and transparent, add 1.64g sodium metaaluminate (Al 2 o 3 , 55wt.%), stirred until clear and transparent, then added 32.0g of silica sol (SiO 2 , 30wt.%), vigorously stirred for about 30min to obtain the reactant precursor. The molar ratio of each component in the reactant gel (in terms of its oxides) is: 1.5Na 2 O:2.0K 2 O:20SiO 2 :1Al 2 o 3 :400H 2 O. Add 6.0wt.% (based on SiO in the reactant gel) in the reactant gel 2 mass fraction of the total m...

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Abstract

The invention provides a method for synthesizing an aluminosilicate molecular sieve by using a seed crystal method. Natural aluminosilicate mineral activated by alkali treatment is used as a seed crystal for synthesis of the aluminosilicate molecular sieve, a target molecular sieve product is obtained through hydrothermal crystallization synthesis, a conventional molecular sieve seed crystal doesnot need to be added in the synthesis process, any organic template agent is not used, and therefore, a process of roasting the synthesis product to remove the template agent is not required. According to the method for synthesizing the aluminosilicate molecular sieve, the requirements on crystallinity and nucleation time can be met, the synthesis cost of the aluminosilicate molecular sieve is greatly reduced, environmental pollution caused by roasting to remove the template agent is greatly relieved, the development concept of green synthesis of the molecular sieve is met, and the method hasa wide application prospect.

Description

technical field [0001] The present invention relates to the preparation technology of molecular sieve catalyst, specifically, the present invention relates to a method for synthesizing aluminosilicate molecular sieve by seed crystal method. Background technique [0002] Molecular sieves, such as Y, ZSM-5, mordenite, ZSM-35, Beta, etc., as a type of solid acid catalyst, are widely used in catalytic cracking, hydrocracking, hydrocarbon isomerization, alkylation and other petroleum processing and in petrochemical process. However, most of the molecular sieves used in industry, especially the molecular sieves with medium and high silicon-aluminum ratios, are synthesized from chemical reagents such as sodium silicate, sodium aluminate, aluminum sulfate, etc., with the help of organic templates. In the synthesis process of molecular sieves, the use of organic templates will not only increase the cost of molecular sieve synthesis, but more importantly, organic templates are genera...

Claims

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Application Information

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IPC IPC(8): C01B39/44C01B39/26
CPCC01B39/44C01B39/26C01P2002/72C01P2006/12C01P2006/14C01P2006/17C01P2002/86C01P2004/03
Inventor 刘海燕郑涛刘植昌孟祥海张睿徐春明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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