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Method for preparing ethylene propylene by catalytic pyrolysis of light oil

A catalytic cracking, ethylene propylene technology, applied in chemical instruments and methods, hydrocarbon cracking to hydrocarbon production, molecular sieve catalysts, etc., can solve the problems of high catalyst use temperature and low ethylene propylene yield, and achieve high acid strength and good catalytic activity. Effect

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

[0011] The technical problem to be solved by the present invention is the problem of high catalyst service temperature and low yield of ethylene propylene existing in the prior art, and a new method for producing ethylene propylene by catalytic cracking of light oil is provided

Method used

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  • Method for preparing ethylene propylene by catalytic pyrolysis of light oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 284 grams of sodium metasilicate and dissolve it into solution A with 300 grams of distilled water. Take 33.4 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 is used as template M. After stirring for a period of time, adjust the pH value to 12 with sodium hydroxide and dilute sulfuric acid, and control the molar ratio of the sol as: Si:Al:M:H 2 O: OH - =1:0.1:0.4:40:1.2, put the mixed solution in an autoclave, keep it at 180℃ for 40 hours, then take it out and wash it twice, dry at 120℃ for 4 hours, and roast at 550℃ for 3 hours to prepare ZSM- 5 / Mordenite / Analcite symbiotic molecular sieve. XRD diffraction quantitatively shows that the mass percentage of ZSM-5 in the symbiotic molecular sieve is 50.2%, the MOR content of mordenite is 23.6%, and the content of analcime ANA is 26.2%. Exchange twice with 5% ammonium nitrate solutio...

Embodiment 2～7

[0024]According to the method for synthesizing the symbiotic molecular sieve in Example 1, the raw materials used are shown in Table 14, and the different molar ratios of the solutions are controlled. The ZSM-5 / mordenite / analcime molecular sieve synthesized respectively is shown in Table 2. The proportions of ZSM-5, mordenite and analcime in the symbiotic molecular sieve are shown in Table 3. According to the method of Example 1, the results are shown in Table 4.

[0025] Table 2

[0026] Example

Solution molar ratio

Sample serial number

Example 2

Si:Al:M:H 2 O: OH -1 =1:0.005:0.4:40:5

FH-2

Example 3

Si:Al:M:H 2 O: OH -1 =1:0.01:0.4:40:0.01

FH-3

Example 4

Si:Al:M:H 2 O: OH -1 =1:0.1:0.1:50:0.001

FH-4

Example 5

Si:Al:M:H 2 O: OH -1 =1:0.125:0.2:40:0.5

FH-5

Example 6

Si:Al:M:H 2 O: OH -1 =1:0.167:0:60:2

FH-6

Example 7

Si:Al:M:H 2 O: OH -1 =1:0.2:0.01:80:4

FH-7

...

Embodiment 8

[0032] 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 2 O=1∶0.05∶0.4∶40, add 3.0 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℃ In 3 hours, a ZSM-5 / mordenite / β zeolite symbiotic molecular sieve was prepared. Quantitatively using XRD diffraction, it can be seen that the mass percentage of ZSM-5 in the symbiotic molecular sieve is 60.5%, the content of mordenite is 23...

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Abstract

The invention relates to a method for preparing ethylene propylene by light oil through catalytic cracking, which mainly solves the problems of low catalyst activity, low ethylene propylene yield and high reaction temperature of the current ethylene propylene preparing technique by catalytic cracking. The invention properly solves the problems by adopting the technical proposals that: a ZSM-5 / mordenite / analcime intergrown molecular sieve, a ZSM-5 / mordenite / zeolite beta intergrown molecular sieve, a ZSM-5 / mordenite / zeolite Y intergrown molecular sieve, a ZSM-5 / mordenite / MCM-22intergrown molecular sieve or a mixture thereof serves as a catalyst, the light oil with the compositions of C4 to C10 hydrocarbon is adopted as a raw material, and the material is in contact reaction with a catalyst under the conditions of a reaction temperature of between 600 and 700 DEG C, a reaction pressure of between 0.001 and 0.5MPa, a reaction weight space velocity of between 0.1 and 4 / h, and water / light oil being present in a weight ratio of 0.5-6: 1, and the method of preparation can be used for the industrial production of preparing the ethylene propylene by the light oil through catalytic cracking.

Description

Technical field [0001] The invention relates to a method for preparing ethylene and propylene by catalytic cracking of light oil. Background technique [0002] As the leader of the petrochemical industry, the ethylene and propylene industry plays a pivotal role in the development of the national economy. 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 produces more than 100 million tons of ethylene annually, mainly using naphtha (or ethane) as raw material, using steam thermal cracking technology (at a temperature of about 800°C), and its output exceeds 90% of the total output. However, steam cracking requires high reaction temperature, high energy consumption, expensive high-temperature alloy steel molecular sieve, short operation cycle,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06B01J29/80
CPCY02P20/52
Inventor 马广伟谢在库陈亮杨霞琴
Owner CHINA PETROLEUM & CHEM CORP
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