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Method for preparing ethylene and propylene by catalytic pyrolysis

An ethylene propylene and catalytic cracking technology, applied in chemical instruments and methods, hydrocarbon cracking to hydrocarbon production, molecular sieve catalysts, etc., can solve the problems of low catalyst activity, high reaction temperature, low ethylene propylene yield, etc., and achieve less carbon deposition. , The effect of high acid strength and high acid density

Active Publication Date: 2009-01-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the catalyst activity used in the existing naphtha catalytic cracking reaction to produce ethylene propylene is low, the yield of ethylene propylene is low, and the problem of high reaction temperature, and a new catalytic cracking method for producing ethylene propylene is provided. Methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 284 grams of sodium metasilicate and dissolve it into solution A with 300 grams of distilled water. Take 33.3 grams of aluminum sulfate and use 100 grams of distilled water to make solution B. Pour solution B into solution A slowly, stir vigorously, and then add 24.4 grams of ethyl acetate. Diamine, after stirring for a period of time, adjust the pH value at 11.5 with dilute sulfuric acid, and control the molar ratio of the sol as: Si:Al:ethylenediamine:H 2 O=1:0.1:0.4:40, add seed crystals containing ZSM-5 and mordenite precursor, stir for 30 minutes, put the mixed solution in an autoclave, keep it at 180°C for 40 hours, then take it out and wash it twice. After drying at 120°C for 4 hours and calcination at 550°C for 3 hours, an intergrowth molecular sieve of ZSM-5 and mordenite was prepared. XRD diffraction quantitatively showed that the weight content of ZSM-5 and mordenite in the intergrowth molecular sieve was 95% and 5%, respectively. Exchange twice at 70°C with...

Embodiment 2

[0027] Take 284 grams of sodium metasilicate and dissolve it into solution A with 300 grams of distilled water. Take 16.7 grams of aluminum sulfate and use 100 grams of distilled water to make solution B. Pour solution B into solution A slowly, stir vigorously, and then add 12.2 grams of ethyl acetate. Diamine and 29.4 grams of tetraethylammonium hydroxide (the mixed template is marked as M), after stirring for a period of time, adjust the pH value to 11 with dilute sulfuric acid, and control the molar ratio of the sol as: Si:Al:M:H 2O=1∶0.05∶0.4∶40, add 2.8 grams of beta zeolite seed crystals, put the mixed solution into the autoclave, keep it at 160℃ for 40 hours, then take it out and wash it twice, dry at 120℃ for 4 hours, and roast at 550℃ After 3 hours, a ZSM-5 / β zeolite intergrowth molecular sieve was prepared. Quantitatively using XRD diffraction, the weight percentage of ZSM-5 in the intergrowth molecular sieve was 94.6% and the β zeolite was 5.4%. The ammonium nitrate sol...

Embodiment 3

[0029] Take 284 grams of sodium metasilicate and dissolve it into solution A with 300 grams of distilled water. Take 33.3 grams of aluminum sulfate and use 100 grams of distilled water to make solution B. Pour solution B into solution A slowly, stir vigorously, and then add 24.4 grams of ethyl acetate. Diamine, after stirring for 20 minutes, adjust the pH value at 11.5 with dilute sulfuric acid, and control the molar ratio of the sol: Si:Al:ethylenediamine:H 2 O=1:0.1:0.4:40, add 2.8 grams of Y zeolite seed crystals, put the mixed solution into the autoclave, keep it at 130°C for 40 hours, then take it out and wash it twice, dry at 120°C for 4 hours, and roast at 550°C In 3 hours, ZSM-5 / Y zeolite symbiotic molecular sieve was prepared. Quantitative XRD diffraction shows that the symbiotic molecular sieve contains 94.5% by weight of ZSM-5 and 5.5% by weight of Y zeolite. Exchange twice with 5% ammonium nitrate solution at 70°C, then roast at 550°C for 3 hours, and repeat twice to p...

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PUM

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Abstract

The invention relates to a method for preparing ethylene and propylene through catalytic cracking, mainly solving the problems of the prior catalyst used for preparing ethylene and propylene through catalytic cracking of high service temperature and low yields of ethylene and propylene. Through taking naphtha the compositions of which are C4 to C10 hydrocarbons as raw material, catalytic cracking reaction of the raw material is carried out through a catalyst bed so as to generate ethylene and propylene at a temperature of between 550 and 700 DEG C, under the pressure of between 0.001 and 0.5MPa, at the weight space velocity of between 0.1 and 4 hour<-1> and in the water / naphtha weight ratio of between 0.5 and 4 to 1, wherein the catalyst is at least two of rare earth elements, VA group elements, IIIA group elements, IB group elements or IIB group elements, IA group elements or IIA group elements loaded on ZSM-5 / mordenite intergrowth molecular sieve, ZSM-5 / Beta zeolite intergrowth molecular sieve or ZSM-5 / Y zeolite intergrowth molecular sieve; and the technical proposal solves the problems better, and can be used in the industrial production for preparing ethylene and propylene through catalytic cracking of naphtha.

Description

Technical field [0001] The invention relates to a method for preparing ethylene and propylene through catalytic cracking, in particular to a method for preparing ethylene and propylene through catalytic cracking of naphtha. Background technique [0002] With the development of society, the market demand for ethylene and propylene in my country has increased sharply. The import volume of ethylene and propylene and its downstream products has increased year by year, and the domestic product market share is less than half. At present, the world's ethylene mainly uses naphtha (or ethane) as a raw material and uses steam thermal cracking technology (at a temperature of about 800°C) to produce, and its output exceeds 90% of the total output. Compared with steam thermal cracking, the reaction temperature of catalytic cracking is about 50-200℃ lower than standard cracking reaction, so it consumes less energy than ordinary steam cracking, and the rate of coking on the inner wall of the cr...

Claims

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Application Information

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IPC IPC(8): C07C4/06C07C11/02B01J29/80
CPCY02P20/52
Inventor 谢在库马广伟杨为民肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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