Method for preparing ethylene and propylene by benzin naphtha catalytic pyrolysis

A technology for ethylene propylene and catalytic cracking, which is applied in the production of bulk chemicals, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of short catalyst life and achieve the effects of improved life and good technical effects

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 the problem of short catalyst life in the prior art in the reaction of catalytic cracking of naphtha to produce ethylene propylene, and a new method for producing ethylene propylene from catalytic cracking naphtha is provided

Method used

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  • Method for preparing ethylene and propylene by benzin naphtha catalytic pyrolysis
  • Method for preparing ethylene and propylene by benzin naphtha catalytic pyrolysis
  • Method for preparing ethylene and propylene by benzin naphtha catalytic pyrolysis

Examples

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Effect test

Embodiment 1

[0016] 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 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 with water, and heat it at 150°C The intergrown molecular sieve of ZSM-5 and mordenite was obtained by drying and roasting at 550°C. Quantification by XRD diffraction showed that the weight contents of ZSM-5 and mordenite in the intergrown molecular sieve were 95% and 5%, respectively. Using ammonium nitrate solution with a concentration of 5%, exc...

Embodiment 2

[0018] 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 20 minutes, 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 beta zeolite seed crystals, put the mixed solution in an autoclave, keep it at 160°C for 40 hours, then take it out, wash it with water, dry it at 150°C, and roast it at 550°C to obtain ZSM -5 / beta zeolite symbiotic molecular sieve, the XRD diffraction pattern is shown in curve 1 in Figure 1, quantitatively by XRD diffraction, it can be known that the weight percentage of ZSM-5 in the symbiotic molecular sieve is 94.6%, and β zeolite i...

Embodiment 3

[0020] 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 for washing, dry at 150°C, and roast at 550°C to obtain ZSM -5 / Y zeolite intergrowth molecular sieve. Quantification by XRD diffraction shows that the intergrown molecular sieve contains 94.5% ZSM-5 and 5.5% Y zeolite in weight percentage. Using ammonium nitrate solution with a concentration of 5%, exchanging twice at 70°C, and then roasting at 550°C, after repeating twice, the hydrogen-typ...

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Abstract

The invention relates to a method for producing ethylene propylene by catalytic cracking naphtha, which mainly solves the problems of short service life caused by coking of the catalyst and high consumption of vapor in the reaction of ethylene propylene preparation by catalytic cracking the naphtha. The invention properly solves the problems by adopting the technical proposals that: a naphtha of C4 to C10 hydrocarbon is taken as a raw material, the material hydrocarbon is firstly mixed with a gas inert to reaction after the vaporization, wherein the inert gas and the naphtha are present in a mole ratio of more than 0-5.0: 1, the material mixed gas contacts with a catalyst to generate an ethylene propylene under the conditions of a reaction temperature of between 580 and 750 DEG C, a pressure gauge reaction pressure of more than 0 to 0.5MPa, a weight space velocity of between 0.5 and 3 / h, and water / naphtha being present in a weight ratio of 0-5: 1, wherein the adopted catalyst is selected from at least one of ZSM-5 / mordenite intergrown molecular sieve, ZSM-5 / zeolite beta intergrown molecular sieve or ZSM-5 / zeolite Y intergrown molecular sieve, and the method of preparation can be used for the industrial production of preparing the ethylene propylene by catalytic cracking the naphtha.

Description

technical field [0001] The invention relates to a method for catalytically cracking naphtha to produce ethylene propylene. Background technique [0002] Ethylene propylene is the basic raw material of petrochemical industry. At present, the most common method of producing ethylene propylene is steam pyrolysis of hydrocarbon raw materials (mainly naphtha). Steam pyrolysis of naphtha has the disadvantages of large equipment investment, high reaction temperature, harsh process conditions, high requirements for reactor tube materials, large loss, and low production capacity. [0003] Catalytic cracking of hydrocarbons to produce ethylene propylene is one of the hot topics that people are concerned about. In 2001, Japanese scholars used light naphtha as raw material and 10% La / ZSM-5 zeolite molecular sieve as catalyst, at a temperature of 650°C, a ratio of steam to raw materials of 0.64, and a raw material concentration of 9.6% by volume (diluted with nitrogen). A 61% ethylene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07C11/02B01J29/80
CPCY02P20/52
Inventor 姚晖谢在库马广伟杨为民陈亮
Owner CHINA PETROLEUM & CHEM CORP
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