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Catalyst for producing olefin hydrocarbon by catalytic pyrolysis

A technology for catalytic cracking and olefin production. It is used in catalytic cracking, physical/chemical process catalysts, and hydrocarbon cracking to produce hydrocarbons. It can solve the problems of high reaction temperature, low ethylene and propylene yield, and low catalyst activity, and achieve high acid strength. , The effect of less carbon deposition and high acid density

Active Publication Date: 2008-10-08
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 process for olefin production is provided. catalyst

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. Quantitative XRD diffraction showed that the weight content of ZSM-5 and mordenite in the intergrowth molecular sieve was 95% and 5%, respectively. Exchange twice with 5% ammoni...

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 g of tetraethylammonium hydroxide (the mixed template is marked as M), after stirring for a period of time, adjust the pH value at 11 with dilute sulfuric acid, and control the molar ratio of the sol as: Si:Al:M:H 2 O=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. Quantitative XRD diffraction showed that the weight percentage of ZSM-5 in the intergrowth molecular sieve was 94.6%, and the beta zeolite was 5.4%. The ammonium nitrate...

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 pr...

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Abstract

The present invention relates to a catalyst used for manufacturing olefin by catalytic pyrolysis which mainly solves the problems of high reaction temperature and low ethylene and propylene yield of the existing catalyst to manufacture ethylene and propylene by catalytic pyrolysis. The present invention better solves the problems by adopting the technical proposal of loading at least two elements selected from rare earth elements, the elements of the VA group, the IIIA group, the IB group or the IIB group in the periodic table of elements on the symbiosis molecular sieves of ZSM-5 / mordenite, ZSM-5 / Beta zeolites or ZSM-5 / Y zeolites to compose the catalyst. The present invention can be used for the industrial production of ethylene and propylene by naphtha catalytic pyrolysis.

Description

Technical field [0001] The invention relates to a catalyst for preparing olefins by catalytic cracking, in particular to a catalyst for preparing ethylene and propylene by 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. The coking rate of the inner wall of the cracking furnace tube will be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C10G11/05
CPCC10G11/05B01J29/146B01J29/40B01J29/7049C10G2300/1044B01J29/80B01J2229/20B01J29/7615B01J29/185B01J29/18B01J29/46C10G2400/20C07C4/06B01J37/0009B01J29/76B01J29/405B01J2229/18C10G2300/4018B01J2229/42B01J29/7057B01J29/7007B01J29/084B01J29/70Y02P20/52C07C11/02B01J29/48B01J29/26C07C2/12
Inventor 马广伟谢在库胡永君姚晖杨霞琴
Owner CHINA PETROLEUM & CHEM CORP
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