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A methane oxidative coupling method based on chemical chain lattice oxygen transfer technology

A technology of oxidative coupling and lattice oxygen, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of high operating costs, low selectivity and yield of olefins, and complex structures. Achieve high reactivity and selectivity, reduce excessive oxidation, and avoid direct contact

Active Publication Date: 2022-02-01
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional methane oxidative coupling method, methane and free oxygen are passed into the reactor according to a certain ratio. Under high temperature conditions, part of the methane is activated on the surface of the catalyst, and the other part is activated on the surface of the catalyst to generate methyl functional groups. The generated methyl functional groups A coupling reaction occurs to generate ethane and then dehydrogenates to generate ethylene. In the process of methane activation, coupling and dehydrogenation, due to the high activity of free oxygen, it will react with intermediate products in the process, resulting in excessive oxidation of methane, resulting in olefins The selectivity and yield of the reaction are low; the reaction device of this reaction contains an air separation device, which has high initial investment, high operating cost and complex structure; under high temperature conditions, free oxygen and methane are mixed, and there is a risk of explosion, which greatly Restricted its industrial development

Method used

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  • A methane oxidative coupling method based on chemical chain lattice oxygen transfer technology
  • A methane oxidative coupling method based on chemical chain lattice oxygen transfer technology
  • A methane oxidative coupling method based on chemical chain lattice oxygen transfer technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] raw material:

[0031] Mn(NO 3 ) 2 .4H 2 O: 0.58g, Na 2 WO 4 .2H 2 O: 3.09g, SiO 2 : 7g, urea: 250g.

[0032] Among them, Mn(NO 3 ) 2 .4H 2 O to MnO 2 mass meter, Na 2 WO 4 .2H 2 O to Na 2 WO 4 Mass meter, SiO 2 The mass ratio of the three is 2:28:70;

[0033] Chemical Chaining Methane Oxidative Coupling Method

[0034](1) Dissolve manganese nitrate and sodium tungstate in 1L of water, stir to form a transparent solution, add silicon dioxide and urea to the transparent solution, the pH value is 9.5, raise the temperature to 95°C, stir for 3 hours, wash the obtained solution, After two to three times of suction filtration, put it into a 75°C drying oven to dry for 12 hours. The dried sample is put into a muffle furnace with a heating rate of 5°C / min and a final temperature of 750°C for 4 hours to obtain Na 2 WO 4 / MnO 2 / SiO 2 Catalytic oxygen-donating material.

[0035] (2) Put 2g of catalytic oxygen-supplying material in the fixed bed, raise the ...

Embodiment 2

[0037] raw material:

[0038] Mn(NO 3 ) 2 .4H 2 O: 2.31g, Na 2 WO 4 .2H 2 O: 2.21g, SiO 2 : 7.2g, urea: 250g.

[0039] Among them, Mn(NO 3 ) 2 .4H 2 O to MnO 2 mass meter, Na 2 WO 4 .2H 2 O to Na 2 WO 4 Mass meter, SiO 2 The mass ratio of the three is 8:20:72;

[0040] Chemical Chaining Methane Oxidative Coupling Method

[0041] (1) Dissolve manganese nitrate and sodium tungstate in 1L of water, stir to form a transparent solution, add silicon dioxide and urea to the transparent solution, the pH value is 9.5, raise the temperature to 95°C, stir for 3 hours, wash the obtained solution, After two to three times of suction filtration, put it into a 75°C drying oven to dry for 12 hours. The dried sample is put into a muffle furnace with a heating rate of 5°C / min and a final temperature of 750°C for 4 hours to obtain Na 2 WO 4 / MnO 2 / SiO 2 Catalytic oxygen-donating material.

[0042] (2) Put 2g of catalytic oxygen-supplying material in the fixed bed, raise t...

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Abstract

The invention belongs to the technical field of methane conversion, in particular to a methane oxidative coupling method based on the chemical chain lattice oxygen transfer technology, which uses a composite material with methane catalytic cracking and selective oxygen supply functions to realize one-step efficient methane oxidative coupling The catalytic oxygen supply material is composed of a methane cracking catalyst and a selective oxygen supply material. The catalytic part provides active sites for the activated cracking of methane, and the oxygen supply material part transmits oxygen atoms through lattice oxygen to supply oxygen for the reaction. Oxidation and regeneration of free oxygen; Catalytic oxygen carrier oxidation-reduction cycle realizes the transfer of oxygen in this reaction, avoiding the direct contact between free oxygen and methane; Directional control of lattice oxygen activity weakens the excessive oxidation of methane and improves the oxidation of olefins. Selectivity and yield of olefins; at 800°C to 850°C, methane oxidative coupling has higher reactivity and selectivity.

Description

technical field [0001] The invention belongs to the technical field of methane conversion, in particular to a methane oxidative coupling method based on chemical chain lattice oxygen transfer technology. Background technique [0002] Ethylene is the most important basic organic chemical raw material. For a long time, its production has been dependent on the petroleum cracking route, and the resulting environmental pollution and other problems are becoming more and more serious. In recent years, the price of crude oil has continued to rise, which has triggered an increase in the price of ethylene cracking raw materials. At the same time, the supply of ethylene cracking raw materials is also very prominent. Faced with this situation, countries around the world are adjusting their energy utilization structures and constantly looking for new ethylene production routes. . With the development of shale gas in the United States and the discovery of combustible ice in the South Chi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/84C07C11/04B01J23/34
CPCC07C2/84B01J23/34C07C2523/34C07C11/04Y02P20/52
Inventor 肖睿曾德望邱宇
Owner SOUTHEAST UNIV
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