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In-situ crystallization cracking catalyst and preparation method thereof

A cracking catalyst and in-situ crystallization technology, which is applied in catalytic cracking, cracking, petroleum industry, etc., can solve the problems of reducing the crystallinity of Y-type molecular sieves, and achieve good grain surface regularity, moderate packing density, and high equilibrium activity Effect

Active Publication Date: 2008-08-27
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current in-situ crystallization type cracking catalyst still improves the silicon-aluminum ratio of Y-type molecular sieve through subsequent chemical dealumination of the crystallized product, but at the same time reduces the crystallinity of Y-type molecular sieve

Method used

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  • In-situ crystallization cracking catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take by weighing 209.31 grams of sodium hydroxide (purity 99%; the following examples are the same) and dissolve in 541.76 grams of water, then add 35.53 grams of aluminum hydroxide powder (purity 99%), heat to boiling and stir the reaction, the reaction solution appearance is clear and transparent After the reaction is completed, it becomes a high alkali sodium metaaluminate solution after cooling.

[0026] Take 100 ml of water glass solution (SiO 2 Content: 254 g / L, Na 2 O content: 76 g / L; the same for the following examples) Put it into a beaker, slowly add 98.0 g of high alkali sodium metaaluminate solution, stir and mix and control the temperature at 32 ± 2 ° C with a water bath, after stirring for 1 hour, at 32 Aging at a constant temperature of ±2°C for 12 hours, the desired directing agent can be obtained, and its molar ratio is 16Na 2 O:Al 2 o 3 : 15SiO 2 : 320H 2 O.

[0027] Take by weighing 235.30 grams of aluminum sulfate solid (Al 2 (SO 4 ) 3 18H ...

Embodiment 2

[0030] Add 300 grams of water glass solution, 16 grams of NaOH and 50 grams of water into the crystallization kettle, and after stirring for 5 minutes, add 45 grams of the directing agent prepared in Example 1, and finally add 100 grams of kaolin clay that has been roasted at 950 ° C for 3 hours. ball. At a speed of 100 rpm, the temperature was raised to 95°C for constant temperature crystallization. The initial effective feed ratio is: 6.9Na 2 O:Al 2 o 3 : 17.0 SiO 2 : 183H 2 O, after the crystallization reaction was carried out for 8 hours, a total of 12 grams of the high alkalinity sodium metaaluminate solution prepared in Example 1 was added at a rate of 4 grams / hour. The overall effective feed ratio is 6.5Na 2 O:Al 2 o 3 : 16.0 SiO 2 : 172H 2 O. After 30 hours of reaction, the crystallinity remained basically unchanged, and the crystallization stopped. The crystallization mother liquor was filtered off, and the microspheres were washed with water to pH=10. 11...

Embodiment 3

[0036] In the crystallization kettle, add the water glass solution, NaOH and water and the directing agent respectively with embodiment 2, then add 100 grams of kaolin microspheres roasted at 925° C. for 10 hours. At a speed of 100 rpm, the temperature was raised to 95°C for constant temperature crystallization. The initial effective feed ratio is 5.9Na 2 O:Al 2 o 3 : 14.5SiO2 2 : 157H 2 O, after the crystallization reaction was carried out to 8 hours, a total of 12 grams of the high alkalinity sodium metaaluminate solution prepared in Example 1 was added at a rate of 4 grams / hour. The crystallization time was 28 hours. The crystallization mother liquor was filtered off, and the microspheres were washed with water until pH = 10 to obtain 120 g of in-situ crystallized NaY microspheres with a crystallinity of 53.8% and a silicon-aluminum ratio of 5.4.

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Abstract

The invention relates to an in-situ crystallization type cracking catalyst and the process for preparation, which is characterized in that the process for preparation comprises mixing roasting kaolin microsphere, water glass, sodium hydroxide and guiding agent, and then crystallizing in original position after heating up to 80-110 DEG C, adding aluminum source in the in the process of crystallizing during 1-48hours, and getting crystallization product, filtering and washing the crystallization product, exchanging, roasting, lowering natrium, modifying to get cracking catalyst, wherein the cracking catalyst contains Y-shaped molecular screen with high degree of crystallization and high silica alumina ratio, which is suitable for catalyzing and cracking heavy oil.

Description

technical field [0001] The invention relates to an in-situ crystallization type cracking catalyst and a preparation method thereof, in particular to an in-situ crystallization type Y-type molecular sieve cracking catalyst with high crystallinity and high silicon-aluminum ratio and a preparation method thereof. Background technique [0002] At present, the industry mainly adopts two forms to produce Y-type molecular sieve cracking catalysts. The first type is called semi-synthetic binder type, that is, the Y-type molecular sieve is exchanged and modified, mixed with kaolin and binder and sprayed. The second type is called the in-situ crystallization type, that is, kaolin spray microspheres are calcined at high temperature and hydrothermally crystallized in an alkaline system, so that Y-type molecular sieves grow on the inner and outer surfaces of the microspheres, and then exchange and modify to obtain a finished catalyst. The in-situ crystallization type has the following ch...

Claims

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Application Information

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IPC IPC(8): C10G11/05
Inventor 陆善祥王苏陈辉欧阳丹霞许锋于冀勇
Owner EAST CHINA UNIV OF SCI & TECH
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