Method for in-situ synthesis of Y-type molecular sieve

An in-situ synthesis and molecular sieve technology, applied in the field of catalysis, can solve problems such as the increase of ex-situ crystallization products, and achieve the effects of low price, low production cost and improving zeolite crystallization efficiency.

Active Publication Date: 2010-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

USP3657154 adds metakaolin with very fine grinding particle size to the crysta

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]It is the in-situ crystallization faujasite product of the present invention. Mix 455g raw coal-based kaolin powder produced in Shanxi with a particle size of 600 mesh and 30g of small alumina, add 300g of water, stir and beat, then add 12g of hydrochloric acid, stir for 1 hour, then spray dry, and control the tail gas temperature at 200°C. The microspheres obtained by spray drying were calcined at 600°C for 2 hours, pulverized, added 870g of water for beating, then added 120g of polyethylene glycol [molecular weight 4000], 48g of solid sodium hydroxide, stirred and dissolved, and added 1705g of water glass with a modulus of 3.2 (silicon oxide Content 32.3%) and 150gY molecular sieve directing agent, after mixing and stirring evenly, move into the autoclave. The autoclave was sealed, and the temperature was raised to 105°C in 1.5 hours, and crystallized at constant temperature for 20 hours. After the crystallization is completed, the temperature is lowered, the product ...

Embodiment 2

[0024] It is the in-situ crystallization faujasite product of the present invention. Add 250g of water to 520g coal-based kaolin raw powder produced in Inner Mongolia with a particle size of 1200 mesh, stir and beat, then add 100g of water glass, stir for 1 hour, then spray dry, and control the tail gas temperature at 180°C. The microspheres obtained by spray drying were calcined at 850°C for 2 hours, pulverized, added 870g of water for beating, then added 160g of polyethylene glycol [molecular weight 20000], 52g of solid sodium hydroxide, stirred and dissolved, then added 1705g of water glass with a modulus of 3.2 (silicon oxide Content 32.3%) and 90gY molecular sieve directing agent, after mixing and stirring evenly, move into the autoclave. The autoclave was sealed, and the temperature was raised to 100°C in 2 hours, and crystallized at constant temperature for 28 hours. After the crystallization is completed, the temperature is lowered, the product is taken out and filter...

Embodiment 3

[0026] It is the in-situ crystallization faujasite product of the present invention. Add 200g of water to 380g of coal-based kaolin raw powder produced in Hebei Province, and then add 20g of small-pore alumina, 80g of aluminum chloride solution (alumina content of 12%), and 50g of water glass. After stirring for 1 hour, spray Drying, the tail gas temperature is controlled at 220°C. The microspheres obtained by spray drying were calcined at 725°C for 2 hours, pulverized, added 870g of water for beating, then added 20g of polyethylene glycol [molecular weight 1000], 52g of solid sodium hydroxide, stirred and dissolved, and added 1705g of water glass with a modulus of 3.2 (silicon oxide Content 32.3%) and 30gY molecular sieve directing agent, after mixing and stirring evenly, move into the autoclave. The autoclave was sealed, and the temperature was raised to 97°C in 2 hours, and the crystallization was carried out at constant temperature for 37 hours. After the crystallization...

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Abstract

The invention relates to a method for the synthesis of a Y-type molecular sieve, which comprises the following steps: (1) making coal-series kaolin and a binder into slurry; (2) spray drying the slurry and making the spray-drying product into microspheres; (3) roasting the microspheres; (4) mixing the microspheres with an alkaline crystallizing solution containing an organic template to crystallize the microspheres under a hydrothermal condition; and (5) obtaining an in-situ crystallization product by filtering and washing. Using the coal-series kaolin as a raw material for the in-situ molecular sieve synthesis, the method expands raw material sources and reduces the production cost of products. And the product of the method is large in specific surface area and high in crystallinity and can be used in reaction processes such as catalytic cracking.

Description

technical field [0001] The invention belongs to the field of catalysis, and relates to a Y-type molecular sieve catalytic material used in the field of petroleum refining chemistry. Specifically, it is a method for preparing Y-type molecular sieves by in-situ crystallization technology using kaolin as a matrix. technical background [0002] Heden et al. first disclosed in US3391994 the NaY in situ crystallization technology using kaolin as a raw material to prepare active components and matrix symbiosis. Engelhard's further research on the characteristics of in-situ crystallization of Y-type zeolite molecular sieves on kaolin microspheres was mainly elaborated in the patent US4493902 published in 1985. The main purpose is to provide a material prepared by in-situ crystallization FCC catalyst. Therefore, the so-called "in-situ crystallization" mainly means that the crystallization of molecular sieves is carried out on the kaolin microspheres themselves. Microspheres are ro...

Claims

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Application Information

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IPC IPC(8): C01B39/24
Inventor 陈松刘立军方向晨张晓萍
Owner CHINA PETROLEUM & CHEM CORP
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