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Catalytic cracking fluidized bed catalyst synthesized in situ

A fluidized bed catalyst and in-situ synthesis technology, which is applied in catalytic cracking, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of low yield and low conversion rate of naphtha, and achieve high yield and suppress Hydrogen transfer and carbon deposition, effect of reducing clogging

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Current reports show that the catalytic cracking catalyst prepared by the prior art has the problems of low conversion rate of naphtha and low yield of ethylene and propylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix 40 grams of raw kaolin, 150 grams of silica sol and 310 grams of water uniformly to obtain a slurry, spray and form small balls with a diameter of 20 to 200 μm, and roast at 1000° C. for 4 hours to obtain spray microspheres a.

[0020] Get 50 gram spray microspheres a, 16.0 gram sodium hydroxide, 15.0 gram aluminum nitrate, after 6.2 gram ethylenediamine and 300 gram water mix homogeneously (in this mixture composition, do not comprise kaolin, the silicon aluminum atom molar ratio of all the other raw materials is 25.0), transferred to a closed reactor for crystallization at 170°C for 48 hours. After crystallization, the product was washed, dried at 120°C for 4 hours, and calcined at 550°C for 8 hours to obtain sodium-type in-situ molecular sieve microspheres. Sodium-type microspheres were exchanged with 1 mole of ammonium nitrate solution, washed, dried at 120° C. for 8 hours, and calcined at 600° C. for 3 hours to obtain hydrogen-type molecular sieve microspheres ...

Embodiment 2

[0025] On the in situ synthesized hydrogen-type microspheres, the b load was 2.0 parts by weight of P 2 o 5 , 8.0 parts La 2 o 3 and 5.0 parts of MgO, dried at 120° C. for 4 hours, and calcined at 500° C. for 4 hours to obtain catalyst f. The relative crystallinity of ZSM-5 zeolite in the catalyst is 52%.

Embodiment 3

[0027] In situ synthesized hydrogen-type microsphere c loading is 5.0 parts by weight of P 2 o 5 , 4.0 parts CeO 2 and 2.5 parts of CaO, dried at 120° C. for 4 hours, and calcined at 500° C. for 4 hours to obtain catalyst g. The relative crystallinity of ZSM-5 zeolite in the catalyst is 38%.

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Abstract

The invention discloses a catalytic cracking fluidized bed catalyst synthesized in situ, which is mainly used for solving the technical problems of low naphtha conversion rate and low yields of ethylene and propylene when the conventional fluidized bed catalyst is used for catalyzing cracking of naphtha for preparing ethylene and propylene. The catalyst comprises the following components in parts by weight: (1) 0.5-15.0 parts of at least one selected from phosphorus, rare-earth or alkali-earth element oxide and (2) 85.0-99.5 parts of catalyst selected from microspheres which are synthesized in situ and contain a ZSM-5 molecular screen and of which the particle sizes are 10-200 mum. Due to the adoption of the technical scheme, the problems are well solved; and the catalyst can be applied to industrial production of preparation of the ethylene and the propylene by the catalytic cracking of the naphtha.

Description

technical field [0001] The invention relates to an in-situ synthesized catalytic cracking fluidized bed catalyst, in particular to a fluidized bed catalyst prepared by in-situ crystallization technology for catalytic cracking to produce ethylene and propylene. Background technique [0002] Ethylene and propylene are two very important petrochemical raw materials. At present, ethylene and propylene are mainly produced by steam cracking process in the world. Because the traditional steam cracking reaction temperature is as high as 820-1000°C, the process energy consumption is very high, accounting for about 50% of the energy consumption of the entire ethylene industry. This process is a non-catalytic free radical thermal cracking mechanism, and the ethylene / propylene ratio in the product is low (0.5-0.7). At present, the traditional steam cracking process is facing a severe test in the face of the country's requirements for energy saving and consumption reduction of 20% durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C10G11/05C07C4/06C07C11/04C07C11/06
CPCY02P20/52
Inventor 汪哲明陈希强肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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