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Fluid catalyst for preparing olefin through catalytic cracking and preparation method thereof

A fluidized bed catalyst, catalytic cracking technology, applied in catalytic cracking, physical/chemical process catalyst, hydrocarbon cracking to produce hydrocarbons, etc., can solve the problems of high yield of ethylene and propylene, low conversion rate, low reaction temperature, etc. The effect of increasing conversion rates

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is the technical problem of low conversion rate and low yield of ethylene and propylene under high reaction temperature and low temperature conditions in the process of catalytic cracking of existing catalysts to produce ethylene and propylene, and a new catalyst is provided , the catalyst has the advantages of low reaction temperature, high low temperature reaction activity, and high yield of ethylene and propylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Take 1.2g sodium aluminate (NaAlO 2 ), 60g of tetrapropylammonium hydroxide (25% aqueous solution) and 100g of water were mixed, dissolved and clarified, and then 60g of tetraethylorthosilicate was added therein, and aged at 60°C for 24 hours after mixing evenly. Mix the aged mixture with 200g cetyltrimethylammonium bromide (8% aqueous solution), adjust the pH value to 9.5 with dilute acid, crystallize at 110°C for 48h, filter and wash the product, and dry at 120°C. Calcined at 550°C for 4 hours to remove the template agent to obtain a mesoporous / microporous composite molecular sieve, which is denoted as FH-1, and the silicon-aluminum ratio Si / Al of the molecular sieve is 20.

[0033] 2) Exchange FH-1 into H-type molecular sieve through ammonium exchange; take ZSM-5 molecular sieve with a silicon-aluminum ratio Si / Al of 200, and make H-type molecular sieve through ammonium exchange;

[0034] 3) Mix the two H-type molecular sieves that have been exchanged in step 2 w...

Embodiment 2

[0037] 1) Take the ZSM-5 molecular sieve whose silicon-aluminum ratio Si / Al is 100 and the HF-1 molecular sieve prepared in Example 1, and make H-type molecular sieve through ammonium exchange;

[0038] 2) Mix the two H-type molecular sieves exchanged in step 1 with a certain amount of kaolin, aluminum sol, silica sol and water in proportion, and prepare microspheres of 20-200 μm by spray drying. Roasting 4h is prepared into the precursor of catalytic cracking olefins fluidized bed catalyst;

[0039] 3) Ammonium phosphate and ytterbium nitrate solutions were used as impregnating solutions respectively, and phosphorus and rare earth element Yb were supported on the catalyst precursor prepared in step 2) by impregnation method, and finally dried at 110°C for 12h and calcined at 610°C for 8h to obtain the catalyst. As b, the composition by weight percent is: 10% FH-1: 40% ZSM-5: 30% kaolin: 12.0% Al 2 o 3 : 3.0% SiO 2 : 3.0%P 2 o 5 : 2.0% Yb 2 o 3 .

Embodiment 3

[0041] 1) Take the ZSM-5 molecular sieve whose silicon-aluminum ratio Si / Al is 20 and the HF-1 molecular sieve prepared in Example 1, and make H-type molecular sieve through ammonium exchange;

[0042] 2) Mix the two H-type molecular sieves exchanged in step 1 with a certain amount of kaolin, aluminum sol and water in proportion, and prepare microspheres of 20-200 μm by spray drying method, and prepare the microspheres by roasting at 620 ° C for 5 hours into the precursor of fluidized bed catalyst for catalytic cracking to olefins;

[0043] 3) Using diammonium hydrogen phosphate and cerium nitrate solution as the impregnating solution, phosphorus and rare earth element Ce were loaded on the catalyst precursor prepared in step 2) by the impregnation method, and finally dried at 100°C for 16h and calcined at 610°C for 8h to obtain the catalyst , denoted as c, the composition by weight percentage is: 5% FH-1: 25% ZSM-5: 55% kaolin: 13% Al 2 o 3 : 0.5%P 2 o 5 : 1.0% CeO 2 . ...

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PUM

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Abstract

The invention relates to a fluid catalyst for preparing an olefin through catalytic cracking and a preparation method thereof. The fluid catalyst and the preparation method thereof mainly solve the technical problems that the existing catalyst is high in reaction temperature, low in low-temperature percent conversion and ethylene and propylene yields in the process of catalytically cracking naphtha to prepare the ethylene and the propylene. According to the invention, the fluid catalyst and the preparation method are adopted to solve the problems; the fluid catalyst comprises the following components in parts by weight: 1) 20.0-55.0% of kaolin; 2) 10.0-25.0% of bonding agent; 3) 0.2-5.0% of phosphorus oxide; 4) 0.1-5.0% of rare earth element oxide; 5) 25.0-60.0% of ZSM-5 molecular sieve; and 6) 5.0-20% of mesoporous / microporous composite molecular sieve, wherein the mesoporous / microporous composite molecular sieve is a catalyst for an MCM-41 composite molecular sieve and a ZSM-5 composite molecular sieve with the silica-alumina ratio of Si to Al of 20-100. Therefore, the fluid catalyst and the preparation method thereof can be applicable to the industrial production of catalytically cracking the naphtha to prepare the ethylene and the propylene.

Description

technical field [0001] The invention relates to a fluidized bed catalyst for preparing ethylene and propylene by catalytic cracking of naphtha and a preparation method thereof. Background technique [0002] Ethylene and propylene are the two most basic petrochemical raw materials, and their production capacity and production level are often important indicators to measure a country's economic development level. Currently, more than 90% of ethylene and propylene are produced by steam cracking of hydrocarbons. However, steam cracking has the disadvantages of high reaction temperature (800-900°C), high energy consumption, high carbon monoxide and carbon dioxide emissions, and difficult regulation of propylene / ethylene (P / E). In order to overcome the above shortcomings, catalytic cracking technology came into being. At present, finding a suitable catalytic cracking catalyst has become the focus of scientific research workers. [0003] The Russian Institute of Organic Synthesi...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J35/10C07C4/06C07C11/04C07C11/06C10G11/05
CPCY02P20/52
Inventor 陈希强汪哲明肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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