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Reaction device and method for preparing ethylene through oxidative coupling of methane

A reaction device, oxidative coupling technology, applied in chemical instruments and methods, organic chemistry, bulk chemical production, etc., can solve the problems of deep oxidation of ethylene, low selectivity, low ethylene yield, etc., to reduce CO and CO2 , improve selectivity and yield, improve the effect of methane conversion

Active Publication Date: 2021-10-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, natural gas is mainly burned directly as a fossil fuel, and further processing is less than 10% of synthetic chemical raw materials
However, the reaction uses a mixed feed of methane and oxygen, which has poor safety and is likely to cause deflagration
In addition, oxygen is fed concentratedly from the bottom of the fluidized bed, and the concentration of oxygen in the lower part of the bed is too high, resulting in a large amount of exothermic reaction, resulting in an excessively large axial temperature gradient.
And the presence of a large amount of oxygen will also lead to CO and CO 2 A large number of non-selective products such as generation, resulting in C 2+ Low selectivity to hydrocarbons
The product cannot be removed in time, causing deep oxidation of ethylene, resulting in low ethylene yield

Method used

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  • Reaction device and method for preparing ethylene through oxidative coupling of methane
  • Reaction device and method for preparing ethylene through oxidative coupling of methane
  • Reaction device and method for preparing ethylene through oxidative coupling of methane

Examples

Experimental program
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Effect test

Embodiment 1

[0073] This example aims at the mechanism of activation of methane in the oxidative coupling reaction of methane with lattice oxygen on the surface of the catalyst as the oxidant.

[0074] Such as figure 1 As shown, the reaction device for oxidative coupling of methane to ethylene includes a pre-lift section 3 , a riser 4 , a catalyst circulation pipe 5 , a stripper 7 , an oxidizer 9 and a first cyclone separator 12 .

[0075] The upper section of the riser 4 extends coaxially into its inner cavity from the bottom of the oxidizer 9; the top of the riser 4 is connected with a first cyclone separator 12, and the gas riser of the first cyclone separator 12 The outlet of 12-1 communicates with the outside of the oxidizer 9, and the outlet of the cyclone material leg 12-2 of the first cyclone separator 12 communicates with the inner cavity of the oxidizer 9; the first cyclone separator A pre-stripping device 13 is arranged on the cyclone material leg of 12.

[0076] An oxygen dis...

Embodiment 2

[0083] This example aims at the mechanism of methane activation using oxygen as an oxidant in the oxidative coupling reaction of methane.

[0084] Such as figure 2 As shown, the reaction device for oxidative coupling of methane to ethylene includes a pre-lift section 3 , a riser 4 , a catalyst circulation pipe 5 , a stripper 7 , an oxidizer 9 and a first cyclone separator 12 .

[0085] The upper section of the riser 4 extends coaxially into its inner cavity from the bottom of the oxidizer 9; the top of the riser 4 is connected with a first cyclone separator 12, and the gas riser of the first cyclone separator 12 The outlet of 12-1 communicates with the outside of the oxidizer 9, and the outlet of the cyclone material leg 12-2 of the first cyclone separator 12 communicates with the inner cavity of the oxidizer 9; the first cyclone separator A pre-stripping device 13 is arranged on the cyclone material leg of 12.

[0086] An oxygen distributor 8 is provided at the bottom of t...

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Abstract

The invention discloses a reaction device and method for preparing ethylene through oxidative coupling of methane. The reaction device comprises a lifting pipe, an oxidizer, a gas stripper, a pre-stripper, a pre-lifting section, a cyclone separator and the like. According to the reaction device, methane and oxygen are separately fed, a multi-mode operation mode is adopted, oxygen supply is flexibly controlled, and flexible control between two reaction mechanisms is realized. Oxygen is not in contact with methane during feeding; and after the reaction, products such as ethylene are directly led out from the reactor and are not mixed with oxygen. The reactor and the oxidizer are coaxially arranged, the reactor is arranged at the lower part, the oxidizer is arranged at the upper part, and the lifting pipe is used as the reactor for reaction. According to the invention, complete separated feeding of oxygen and methane in a methane oxidative coupling reaction process is realized, contact between a product and oxygen is avoided, deep oxidation of the product is avoided, generation of non-selective products is reduced, and the ethylene selectivity and yield are effectively improved.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a reaction device and method for producing ethylene by oxidative coupling of methane. Background technique [0002] Natural gas is cheap and abundant, and it can replace oil as the main energy source and chemical raw material. Methane is the main component of natural gas, accounting for 70% to 90%. At present, natural gas is mainly burned directly as a fossil fuel, and further processing is less than 10% of synthetic chemical raw materials. Oxidative coupling of methane (OCM) is an important way to produce ethylene by non-petroleum route. Its reaction steps are simple, and it has the advantages of short process and good economy. At present, it has become the research focus of direct conversion of methane. [0003] In 1982, Union Carbide Corporation proposed for the first time that ethylene could be produced by direct oxidative coupling of methane. The oxidative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/38C07C2/84C07C11/04
CPCB01J8/388C07C2/84C07C11/04Y02P20/52
Inventor 刘梦溪卢春喜蔡敏姜桂元于长春
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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