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Method for preparing light olefins through fluid catalytic cracking of naphtha

A fluidized catalysis and naphtha technology, which is used in hydrocarbon cracking to produce hydrocarbons, chemical instruments and methods, physical/chemical process catalysts, etc. Activity and diene yield, effect of reducing diffusion limit, increasing number

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

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that in the process of preparing the fluidized bed catalyst for producing ethylene and propylene by catalytic cracking in the existing technology, there are technical problems of low raw material conversion rate and low yield of ethylene and propylene, and a new A method for preparing light olefins from naphtha through fluidized catalytic cracking. This method is applied to the process of preparing ethylene and propylene by catalytic cracking of naphtha. It has the advantages of high conversion rate of raw materials and high yield of ethylene and propylene.

Method used

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  • Method for preparing light olefins through fluid catalytic cracking of naphtha

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Tetraethyl orthosilicate, sodium aluminate, sodium hydroxide, tetrapropylammonium hydroxide and water are prepared according to 100SiO 2 : 5.0Al 2 o 3 : 1.0NaOH: 25.0 Tetrapropylammonium hydroxide: 2500H 2 After the O molar ratio was uniformly mixed, crystallization was carried out at 90° C. for 120 hours to obtain a crystallization directing agent.

[0019] Silica sol (SiO 2 40% by weight), sodium aluminate, sodium hydroxide, ethylenediamine and water according to 100SiO 2 : 5Al 2 o 3 : 40.0 Sodium Hydroxide: 50.0 Ethylenediamine: 4000H 2 The molar ratio of O is mixed uniformly to obtain a raw material mixture, and after adding a crystallization directing agent whose weight percentage is 10% of the raw material mixture and stirred evenly, crystallize at 180° C. for 96 hours to obtain small sodium crystals with a grain size of 200-400 nm. Granular ZSM-5 (silicon-alumina molar ratio is 20) zeolite was washed, separated, dried at 120°C for 4 hours, and calcined at ...

Embodiment 2

[0025] Weigh the required amount of ammonium dihydrogen phosphate, lanthanum chloride and magnesium nitrate to prepare an aqueous solution, load it on hydrogen ZSM-5 zeolite b by impregnation method, dry at 120°C for 8 hours, and calcinate at 600°C for 4 hours to obtain a modified zeolite. Weigh the required amount of kaolin, silica sol (SiO 2 The weight content is 40%), the modified zeolite and water are mixed uniformly to obtain a slurry with a solid content of 30%. After spray drying, roasting at 600°C for 3 hours to obtain a cracking catalyst f with a particle size of 20 to 200 microns, the composition in percent by weight is: 30% kaolin: 20% SiO 2 : 40% Zeolite a: 5.0% P 2 o 5 : 8.0% La 2 o 3 : 2.0% MgO.

Embodiment 3

[0027] Weigh the required amount of phosphoric acid, magnesium nitrate and lanthanum oxalate to prepare an aqueous solution, load the hydrogen-form ZSM-5 zeolite b obtained in Example 3 by the impregnation method, dry at 120°C for 8 hours, and roast at 600°C for 4 hours to obtain the modified form Zeolite. Take the required amount of kaolin, alumina (Al 2 o 3 The weight content is 71%), hydrochloric acid (the weight content is 365%, the dosage is 20% of the weight of alumina), the modified zeolite and water are uniformly mixed to obtain a slurry with a solid content of 30%. After spray drying, roasting at 600° C. for 3 hours to obtain a cracking catalyst g with a particle size of 20 to 200 microns, the composition in percent by weight is: 25% kaolin: 20% Al 2 o 3 : 50% Zeolite b: 4.0% P 2 o 5 : 1.0% MgO : 10% La 2 o 3 .

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Abstract

The invention relates to a method for preparing light olefins through the fluid catalytic cracking of naphtha and mainly solves the technical problems of the existing catalytic cracking method such as low conversation rate of naphtha and low yields of ethylene and propylene. The method uses naphtha and water as raw materials and comprises the following step: contacting the raw materials and a catalyst under the conditions that the temperature is 600-750 DEG C, the weight space velocity is 0.1-2.0h<-1> and the weight ratio of water to oil is 0.2-8.0:1, to react and obtain ethylene and propylene, wherein the catalyst comprises the following components by weight percent: 15.0-60.0% of kaolin, 10.0-30.0% of at least one of silicon oxide and aluminum oxide, 0.5-15% of at least one of phosphorus and rare earth oxide or alkaline earth metal oxide and 25.0-70.0% of 200-1000nm of ZSM-5 zeolite. The technical scheme in the invention better solves the problems and can be used in the catalytic cracking industrial production for preparing ethylene and propylene.

Description

technical field [0001] The present invention relates to a fluidized bed catalyst for preparing olefins by catalytic cracking, in particular to a fluidized bed catalyst which uses small grain ZSM-5 prepared by directing agent method as active component, and uses naphtha as raw material to produce ethylene through catalytic cracking process Fluidized bed catalyst with 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...

Claims

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Application Information

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