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Process for preparing ethylene and propylene by catalytic scission reaction

An ethylene propylene and catalytic cracking technology, applied in chemical instruments and methods, hydrocarbon cracking to produce hydrocarbons, molecular sieve catalysts, etc., can solve the problems of high operating temperature, low catalyst activity, poor ethylene propylene selectivity, etc. The effect of high performance and strong catalytic ability

Active Publication Date: 2008-11-19
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 used in the existing catalytic cracking has low activity, the selectivity of ethylene propylene is poor, and the use temperature is high. A new method for preparing ethylene propylene by catalytic cracking is provided. Advantages of high catalytic activity, high yield of ethylene propylene, and low operating temperature

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 contents of ZSM-5 and mordenite in the intergrown molecular sieve were 95% and 5%, respectively. Use ammonium nitrate solution with a concentration of 5%, ...

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 nit...

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 invention relates to a method for making ethylene and propylene through catalytic cracking, mainly solving the problems of the prior method for making ethylene and propylene through catalytic cracking including high use temperature of catalyst, low activity and poor selectivity of ethylene and propylene. The method solves the problems better through adopting the following technical proposal that: the method takes the solid super acid consisting of the VIB group elements or the VIB group elements and the IVB group elements in the periodic table of elements and loaded on a symbiosis molecular sieve as catalyst, and naphtha with the component being C4-C10 as a raw material so as to carry out catalytic cracking reaction at a temperature of between 550 and 700 DEG C, under a pressure of between 0.01 and 0.5 MPa, at a reaction weight space velocity of between 0.1 and 4 hours<-1> and with the weight ratio between water and naphtha of between 0.5:1 and 4:1, thereby generating ethylene and propylene. Moreover, the method can be used in the industrial production of ethylene and propylene through adopting catalytic cracking.

Description

technical field [0001] The invention relates to a method for producing ethylene propylene by catalytic cracking, which can be used in the industrial production of ethylene propylene produced by catalytic cracking of naphtha. 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, hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/02C07C4/06B01J29/80
CPCY02P20/52
Inventor 谢在库马广伟陈亮肖景娴滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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