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Catalyst for preparing ethylene propylene from catalytic pyrolysis

An ethylene propylene and catalytic cracking technology, applied in physical/chemical process catalysts, molecular sieve catalysts, hydrocarbon cracking to produce hydrocarbons, etc., can solve the problems of high reaction temperature, low catalyst activity, low ethylene propylene yield, etc., and achieve high selectivity , the effect of strong catalytic ability and high acid strength

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

[0013] 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. catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 284 grams of sodium metasilicate, dissolve it into solution A with 300 grams of distilled water, take 33.3 grams of aluminum sulfate, and make solution B with 100 grams of distilled water, slowly pour B solution into A solution, stir vigorously, and then add 24.4 grams of B 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: Si: Al: ethylenediamine: H 2 O=1:0.1:0.4:40, add seeds containing ZSM-5 and mordenite precursors, 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, Drying at 120°C for 4 hours and calcining at 550°C for 3 hours produced an intergrown molecular sieve of ZSM-5 and mordenite. Quantification by XRD diffraction showed that the weight content of ZSM-5 and mordenite in the intergrown molecular sieve was 95% and 5%, respectively. Use ammonium nitrate solution with a concentration of 5%, e...

Embodiment 2

[0028]Take 284 grams of sodium metasilicate, dissolve it into solution A with 300 grams of distilled water, take 16.7 grams of aluminum sulfate, and make solution B with 100 grams of distilled water, slowly pour B solution into A solution, stir vigorously, and then add 12.2 grams of B Diamine and 29.4 grams of tetraethylammonium hydroxide (the mixed template is denoted 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: Si: Al: M: H 2 O=1:0.05:0.4:40, add 2.8 grams of zeolite beta seed crystals, put the mixed solution in an autoclave, keep it at 160°C for 40 hours, then take it out and wash it twice, dry it at 120°C for 4 hours, and bake it at 550°C After 3 hours, the ZSM-5 / beta zeolite intergrowth molecular sieve was prepared, and XRD diffraction quantification showed that the weight percentage of ZSM-5 in the intergrowth molecular sieve was 94.6%, and beta zeolite was 5.4%. Use ammonium nitr...

Embodiment 3

[0030] Take 284 grams of sodium metasilicate, dissolve it into solution A with 300 grams of distilled water, take 33.3 grams of aluminum sulfate, and make solution B with 100 grams of distilled water, slowly pour B solution into A solution, stir vigorously, and then add 24.4 grams of B 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 in an 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 bake at 550°C After 3 hours, the ZSM-5 / Y zeolite intergrowth molecular sieve was prepared. Quantification by XRD diffraction shows that the intergrown molecular sieve contains 94.5% by weight of ZSM-5 and 5.5% by weight of Y zeolite. Use ammonium nitrate solution with a concentration of 5%, exchange twice at 70°C, and then roast at 550°C for ...

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Abstract

The present invention relates to a catalyst used for manufacturing ethylene and propylene by catalytic pyrolysis which mainly solves the problems of high reaction temperature and low ethylene and propylene yield of existing catalyst to manufacture ethylene and propylene by catalytic pyrolysis. The present invention better solves the problems by adopting the technical proposal of composing a solid super acid by selecting at least one from the symbiosis molecular sieves of ZSM-5 and mordenite zeolites, ZSM-5 and Beta zeolites or ZSM-5 and Y zeolites as well as the elements of the VIB group, or the groups of the VIB group and the IVB group in the periodic table of elements loaded on the molecular sieve. The present invention can be used for the industrial production of ethylene and propylene by catalytic pyrolysis.

Description

technical field [0001] The invention relates to a catalyst for producing ethylene and propylene by catalytic cracking. Background technique [0002] As the leader of the petrochemical industry, the ethylene propylene industry plays a pivotal role in the development of the national economy. With the development of society, the market demand for ethylene propylene in my country has increased sharply, the import volume of ethylene propylene and its downstream products has increased year by year, and the market share of domestic products is less than half. At present, the world produces more than 100 million tons of ethylene per year, mainly using naphtha (or ethane) as raw material and using steam pyrolysis technology (at a temperature of about 800°C) to produce, and its output exceeds 90% of the total output. However, steam cracking requires high reaction temperature, high energy consumption, expensive high-temperature-resistant alloy steel materials, short operation period, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80B01J29/076C07C4/06C07C11/04C07C11/06
CPCY02P20/52
Inventor 马广伟谢在库杨为民姚晖
Owner CHINA PETROLEUM & CHEM CORP
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