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Method for preparing NaY molecular sieve by in-situ crystallization

An in-situ crystallization and molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, fajhedral crystalline aluminosilicate zeolite, etc., can solve the problems of harsh synthesis conditions, high synthesis cost, difficult industrial application, etc. Growth rate, grain size reduction, effect of slowing dissolution rate

Active Publication Date: 2017-03-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vast majority of existing reports are based on the hydrothermal synthesis of silica-alumina gels, which either have large particle sizes and wide particle size distributions, or have harsh synthesis conditions, high synthesis costs, or molecular sieves that are difficult to separate and relatively stable. Inferior problems make it difficult for industrial application
It is still a big challenge to develop a small-grain Y-type molecular sieve with small particle size, narrow particle size distribution, low cost, easy separation, good stability, and suitable for industrial production.

Method used

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  • Method for preparing NaY molecular sieve by in-situ crystallization
  • Method for preparing NaY molecular sieve by in-situ crystallization
  • Method for preparing NaY molecular sieve by in-situ crystallization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] With kaolin 2000g (calcium base), sodium silicate 4%, add deionized water and be prepared into the mixed slurry that kaolin solid content is 42%, spray drying, obtain the kaolin spray microsphere that 1840g average particle diameter is 70 μ m; The kaolin spray microsphere The balls were roasted at 950°C for 2 hours to obtain roasted high soil microspheres; the roasted high soil microspheres were soaked in 12mol / L hydrochloric acid and reacted at 45°C for 5 hours, filtered, washed with water, and dried to obtain acid-treated high soil microspheres; 50g The acid-treated high soil microspheres were mixed with 40 mL of silicon source, 95 mL of sodium hydroxide solution, and 3 mL of directing agent, crystallized at 96 ° C for 24 hours, and the filter cake was filtered, washed, and dried to obtain the in-situ crystallization product.

[0038] Measured by X-ray diffraction, the relative crystallinity is 24%, and its scanning electron micrograph and particle size distribution ar...

Embodiment 2

[0040] Using the roasted high soil microspheres obtained in Example 1, soak them in 6mol / L hydrochloric acid and react at 40°C for 5h, filter, wash with water, and dry to obtain acid-treated high soil microspheres; 50g of acid-modified high soil microspheres The ball was mixed with 35mL of silicon source, 90mL of sodium hydroxide solution, and 3mL of directing agent, crystallized at 94°C for 26h, and the filter cake was filtered, washed, and dried to obtain the in-situ crystallization product.

[0041] As determined by X-ray diffraction, the relative crystallinity is 27%, and the scanning electron micrograph and particle size distribution show that the obtained molecular sieve has an average particle size of 214nm.

Embodiment 3

[0043] Using the roasted high soil microspheres obtained in Example 1, soak them in 1mol / L hydrochloric acid and react at 48°C for 5h, filter, wash with water, and dry to obtain acid-treated high soil microspheres; 50g of acid-modified high soil microspheres The ball was mixed with 30mL of silicon source, 85mL of sodium hydroxide solution, and 4mL of directing agent, crystallized at 92°C for 20h, and the filter cake was filtered, washed, and dried to obtain the in-situ crystallization product.

[0044] As determined by X-ray diffraction, the relative crystallinity is 23%, and the scanning electron micrograph and particle size distribution show that the obtained molecular sieve has an average particle size of 240nm.

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Abstract

Disclosed is a method for preparing NaY molecular sieve by in-situ crystallization, comprising steps of taking kaolin as raw material; adding de-ionized water and bonding agent; spraying and drying the prepared mixed slurry to obtain a kaolin microballoon; roasting the kaolin sprayed microballoon at 920-1000 DEG C for 2 hours to obtain the roasted kaolin microballoon; treating the roasted kaolin microballoon by inorganic acid at 30-55 DEG C; mixing and crystalizing the acid-treated kaolin microballoon, the silicon source, the alkali solution and guiding agent; filtering, washing and drying the filter cake to obtain the in-situ crystalized product. The NaY molecular sieve included in the prepared in-situ crystalized product is featured by small mean grain diameter and good stability; the prepared molecular sieve is applicable to the heavy oil fluid catalytic cracking.

Description

technical field [0001] The invention belongs to the field of oil refining catalysts, in particular to catalytic cracking catalysts. Background technique [0002] Fluid Catalytic Cracking (FCC) is an important means of heavy oil processing, and FCC catalyst is continuously researched as a core technology. FCC catalysts are divided into two categories: binder catalysts and in-situ crystallization catalysts. Binder-type catalysts are microsphere catalysts made by bonding molecular sieves and substrates with binders. Formed kaolin microspheres are used as raw materials, and the catalyst is obtained by in-situ growth of molecular sieves on the surface of the microspheres and in the pores. There are big differences between the two types of catalysts in the synthesis system, raw materials and methods. But no matter what kind of catalytic cracking catalyst, Y-type molecular sieve is the most important active component, and its catalytic performance directly affects the result of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
Inventor 孙志国高雄厚刘宏海王宝杰张莉赵红娟胡清勋熊晓云赵晓争
Owner PETROCHINA CO LTD
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