Method for preparing low carbon olefins by catalytically pyrolyzing n-butane through metal chromium framework doped molecular sieve

A low-carbon olefin, catalytic cracking technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of not being efficiently utilized, and achieve low cost, high-efficiency conversion, and simple process effects

Inactive Publication Date: 2016-11-09
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a C4 raw material with relatively stable chemical properties, n-butane has not been efficiently utilized

Method used

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  • Method for preparing low carbon olefins by catalytically pyrolyzing n-butane through metal chromium framework doped molecular sieve
  • Method for preparing low carbon olefins by catalytically pyrolyzing n-butane through metal chromium framework doped molecular sieve
  • Method for preparing low carbon olefins by catalytically pyrolyzing n-butane through metal chromium framework doped molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a metal chromium framework doped ZSM-5 molecular sieve catalyst, wherein SiO 2 / (Cr 2 o 3 +Al 2 o 3 ) molar ratio is 80, Cr 2 o 3 / Al 2 o 3 The molar ratio is 1 / 25, and the metal chromium framework doped ZSM-5 molecular sieve catalyst is prepared by the following steps:

[0043] (1) Mix silica sol with a mass content of 40% and concentrated sulfuric acid, then add chromium nitrate nonahydrate, and stir at a constant temperature of 35° C. for 30 minutes to mix them uniformly to obtain a first mixed solution;

[0044] (2) dissolving aluminum sulfate octadecahydrate in deionized water, then adding it dropwise to the first mixed solution, and stirring at a constant temperature of 35° C. for 30 minutes to mix them uniformly to obtain a second mixed solution;

[0045] (3) Dissolve the template agent tetrapropylammonium bromide in deionized water, then add it dropwise to the second mixed solution, and stir at 35°C for 30 minutes to mix them eve...

Embodiment 2

[0054] The present embodiment provides a metal chromium skeleton doped ZSM-5 molecular sieve catalyst, which is denoted as 2# catalyst, wherein SiO 2 / (Cr 2 o 3 +Al 2 o 3 ) molar ratio is 80, Cr 2 o 3 / Al 2 o 3 The molar ratio is 1 / 10, and the preparation steps of the metal chromium skeleton doped ZSM-5 molecular sieve catalyst are the same as those in Example 1, the difference is only in the content of metal chromium.

[0055] The method of using the catalyst to catalytically crack n-butane to produce low-carbon olefins, and the detection and analysis method of the reaction product are all the same as in Example 1.

[0056] Table 2 shows the catalytic cracking reaction results and the yield of main products of 2# catalyst.

[0057] Table 2 Yield distribution of main products of n-butane catalytic cracking reaction (2#)

[0058]

[0059]

Embodiment 3

[0061] The present embodiment provides a metal chromium framework doped ZSM-5 molecular sieve catalyst, denoted as 3# catalyst, wherein SiO 2 / (Cr 2 o 3 +Al 2 o 3 ) molar ratio is 80, Cr 2 o 3 / Al 2 o 3 The molar ratio is 1 / 10, and the preparation steps of the metal chromium skeleton doped ZSM-5 molecular sieve catalyst are the same as those in Example 1, the difference is only in the content of metal chromium.

[0062] The method of using the catalyst to catalytically crack n-butane to produce low-carbon olefins, and the detection and analysis method of the reaction product are all the same as in Example 1.

[0063] The results of the catalytic cracking reaction and the yield of main products of catalyst 3# are shown in Table 3.

[0064] Table 3 Yield distribution of main products in n-butane catalytic cracking reaction (3#)

[0065]

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Abstract

The invention provides a method for preparing low carbon olefins by catalytically pyrolyzing n-butane through a metal chromium framework doped molecular sieve. The method comprises the following steps that n-butane makes contact with a metal chromium framework doped ZSM-5 molecular sieve catalyst for a reaction at reaction temperature and under the reaction pressure and in a carrier gas atmosphere, and ethylene and propylene are obtained; the metal chromium framework doped ZSM-5 molecular sieve catalyst is prepared and obtained by means of an in-situ synthesis principle, wherein the molar ratio of SiO2 to (Al2O3 and Cr2O3) is 80:160, and the molar ratio of Cr2O3 to Al2O3 is 0.005:1.0. According to the method for preparing low carbon olefins by catalytically pyrolyzing n-butane through the metal chromium framework doped molecular sieve, n-butane which is low in price, easy to obtain, low in additional value, relatively stable in chemical property and difficult to pyrolyze is utilized as the raw material, the metal chromium framework doped ZSM-5 molecular sieve serves as the bifunctional catalyst, and then ethylene and propylene are produced; therefore, n-butane can be utilized efficiently, the yield of ethylene and propylene is high, and a good industrial application prospect is achieved.

Description

technical field [0001] The invention relates to the preparation technology of low-carbon olefins (ie, ethylene and propylene), in particular to a method for preparing low-carbon olefins by catalytic cracking of n-butane with a metal chromium framework doped with molecular sieves, and belongs to the technical field of petrochemical industry. Background technique [0002] As important chemical basic raw materials, ethylene and propylene play an important role in the national economy. With the development of industry, the demand for ethylene and propylene continues to increase, but the existing production process conditions cannot meet the consumption requirements, and a large amount of imports are required. At present, the main production process of ethylene and propylene is steam cracking, but the reaction temperature of steam cracking is high, the energy consumption is high, the requirements for equipment are strict, and the selectivity of low-carbon olefins is low. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/10C07C11/04C07C11/06B01J29/48C01B39/40
CPCB01J29/48B01J2229/183C01B39/40C07C4/10C07C11/04C07C11/06Y02P20/52
Inventor 姜桂元赵震赵丹袁美华张耀远王淑婷徐春明段爱军王雅君刘坚韦岳长
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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