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A method for improving the stability of Y-type molecular sieves

A molecular sieve and stability technology, applied in the direction of crystalline aluminosilicate zeolite, fauhhedral crystalline aluminosilicate zeolite, etc., can solve the problems of cracking activity and selectivity, acid content reduction and other problems

Active Publication Date: 2019-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since Al-O bonds with longer bond lengths are replaced by Si-O bonds with shorter bond lengths, the unit cell of the molecular sieve decreases, and the silicon-aluminum ratio of the skeleton increases to a certain extent, but at the same time, the acid center of the molecular sieve will be affected, and the acid content will be reduced Decrease, which has certain influence on cracking activity and selectivity

Method used

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  • A method for improving the stability of Y-type molecular sieves

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Embodiment 1

[0017] Take by weighing 20g (dry basis) industrial NaY molecular sieve (Na 2 O 12.9%, crystallinity 89%, Sinopec Changling Catalyst Factory) in a beaker, add deionized water for beating, add 140g glycerol after shearing evenly, heat up to 100 ° C for 10 hours, after cooling to room temperature, add 24g TPAOH solution (mass fraction 25wt%), then 110mL aluminum sulfate solution (Al 2 o 3 Content 90g / L) and appropriate amount of ammoniacal liquor (mass fraction 25wt%) are added in the above-mentioned slurry simultaneously, and the adjustment slurry pH value is 9.0, then 10mL water glass solution (SiO 2 content 250g / L, modulus 3.3) was added thereto, and the temperature was raised to 70°C for aging for 2 hours. The above slurry was crystallized at 110°C for 20 hours, and the obtained product was filtered, washed and dried, and then calcined at 600°C for 4 hours to obtain the molecular sieve of the present invention. Recorded as GYG-1.

Embodiment 2

[0019] Weigh 20g NaY molecular sieve (dry basis) in a beaker, add deionized water to make a slurry, add 80g glycerol after shearing evenly, heat up to 150°C for 5 hours, after cooling to room temperature, add 32g TMAOH solution (mass fraction 25wt% ), then 67mL of aluminum sulfate solution and ammonia water were added to the slurry at room temperature, and the pH value of the slurry was adjusted to 10.0, and then 10mL of water glass solution was added therein, and the temperature was raised to 60°C for aging for 2 hours. The above slurry was crystallized at 100°C for 10 hours, and the obtained product was filtered, washed and dried, and then calcined at 650°C for 2 hours to obtain the molecular sieve of the present invention. Recorded as GYG-2.

Embodiment 3

[0021] Weigh 20g NaY molecular sieve (dry basis) in a beaker, add deionized water for beating, shear evenly, add 200g propylene glycol, heat up to 170°C for 8 hours, cool to room temperature, add 30g TPAOH solution and 18gTEAOH solution (mass fraction 25wt %), then aluminum sulfate solution and sodium metaaluminate solution (Al 2 o 3 Content 190g / L) and flow into the above slurry, and adjust the pH value of the slurry to 8.0, then add 17mL water glass solution, and age at 50°C for 2 hours. The above slurry was crystallized at 120°C for 10 hours, and the obtained product was filtered, washed and dried, and then calcined at 550°C for 6 hours to obtain the molecular sieve of the present invention. Recorded as GYG-3.

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Abstract

The invention provides a treating method for improving the stability of a Y-type molecular sieve. The method comprises the following steps: mixing a NaY molecular sieve with polyhydroxy alcohol according to an alcohol-sieve mass ratio of (1-20): 1 and carrying out treatment at 80 to 200 DEG C; then uniformly mixing the NaY molecular sieve with organic base according to a base-sieve mass ratio of (0.1-1): 1; adding an aluminum source and inorganic base and controlling the pH value of system to be 8 to 11; then adding a silicon source and carrying out aging; and subjecting aged slurry to crystallization and recovering a product; wherein a mass ratio of the aluminum source, in terms of Al2O3, to the molecular sieve is (0.1-1): 1, and a mass ratio of the silicon source, in terms of SiO2, to the molecular sieve is (0.1-1): 1. The method can effectively improve the hydro-thermal structural stability and hydro-thermal activity stability of the molecular sieve.

Description

technical field [0001] The invention relates to a method for improving the stability of a Y-type molecular sieve. Background technique [0002] Y-type molecular sieve with faujasite crystal structure has become an important catalyst in modern industry due to its good hydrothermal stability, strong acidity and high activity. Especially in the process of petroleum refining and processing, Y-type molecular sieve is widely used . [0003] The directly synthesized Y-type molecular sieve cannot be directly applied to refining processes such as catalytic cracking due to the high content of sodium oxide. It is necessary to wash the sodium oxide to a lower level by ion exchange, such as ammonium exchange, or to use rare earth ion exchange. The elution of sodium oxide can also improve the structural stability and cracking activity of molecular sieves. [0004] In the process of petroleum refining, the operating conditions of the catalytic cracking process are relatively harsh, so hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 郑金玉王成强罗丁罗一斌
Owner CHINA PETROLEUM & CHEM CORP
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