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Coupled process of oxidative coupling of methane for preparation of ethylene and dry reforming of methane for preparation of synthetic gas

A technology of methane dry reforming and oxidative coupling, which is applied in hydrogen/synthesis gas production, carbon compound catalysts, catalysts, etc., can solve the problems of waste of reaction heat and large consumption, achieve the requirements of energy saving, reduce distribution, and facilitate the separation effect

Inactive Publication Date: 2019-10-29
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this invention uses the methane wet reforming process to produce synthesis gas, which consumes a lot of water and heat, and at the same time, wastes the reaction heat released by the oxidative coupling of methane

Method used

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  • Coupled process of oxidative coupling of methane for preparation of ethylene and dry reforming of methane for preparation of synthetic gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The methane oxidative coupling reactor 2 adopts a fluidized bed reactor and is charged with 10 g Mn-Na 2 WO 4 / SiO 2 Catalyst, the average particle size of the catalyst is 70 μm. Methane dry reforming reactor 6 adopts a tubular fixed-bed reactor, and is loaded with 10 g Ni-Co-Ca-Al 2 o 3 Catalyst, the catalyst particle size range is 250-550 μm. The fluidized bed reactor wraps the tubular fixed bed reactor and couples the two together. Methane oxidative coupling reactor 2 is heated to 850 °C by an external heating furnace, the pressure is 0.2 MPa, CH 4 and O 2 Through the mass flow controllers, the flow rates are controlled to be 800 ml / min and 200 ml / min respectively, mixed first and then passed into the methane oxidation coupling reactor 2, and the reacted gas is degassed through the methane oxidation coupling cooling unit 3 H generated in 2 O, the gas contains 69.8% CH by chromatographic analysis 4 , 10.7% ethylene, 6.4% ethane, 4.3% CO 2 , 6.8% CO, 2.0% H ...

Embodiment 2

[0027] Methane oxidative coupling reactor 2 adopts a tubular fixed-bed reactor and is charged with 10 g Mn-Na 2 WO 4 / SiO 2 Catalyst, the average particle size of the catalyst is 70 μm. The methane dry reforming reactor 6 adopts a fluidized bed reactor and is charged with 10 g Ni-Co-Ca-Al 2 o 3 Catalyst, the catalyst particle size range is 250-550 μm. The tubular fixed-bed reactor wraps the fluidized-bed reactor and couples the two together. The methane oxidative coupling reactor 2 was heated to 800 °C by an external heating furnace, the pressure was 0.1 MPa, CH 4 and O 2 Through the mass flow controllers, the flow rates are controlled to be 600 ml / min and 200 ml / min respectively, mixed first and then passed into the methane oxidation coupling reactor 2, and the reacted gas is degassed through the methane oxidation coupling cooling unit 3 H generated in 2 O, the gas contains 74.0% CH by chromatographic analysis 4 , 8.1% ethylene, 4.3% ethane, 5.2% CO 2 , 7.1% CO, 1.3...

Embodiment 3

[0029] The methane oxidative coupling reactor 2 adopts a fluidized bed reactor and is charged with 10 g Mn-Na 2 WO 4 / SiO 2 Catalyst, the average particle size of the catalyst is 70 μm. The methane dry reforming reactor 6 adopts a fluidized bed reactor and is charged with 10 g Ni-Co-Ca-Al 2 o 3 Catalyst, the catalyst particle size range is 250-550 μm. The methane oxidative coupling fluidized bed reactor wraps the methane dry reforming fluidized bed reactor, coupling the two together. The methane oxidative coupling reactor 2 was heated to 850 °C by an external heating furnace, the pressure was 0.15 MPa, CH 4 and O 2 Through the mass flow controllers, the flow rates are controlled to be 800 ml / min and 200 ml / min respectively, and they are directly passed into the methane oxidation coupling reactor 2 respectively, and the reacted gas is generated in the gas removal by the methane oxidation coupling cooling unit 3 H 2 O, the gas contains 69.8% CH by chromatographic analysi...

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Abstract

The invention discloses a coupled process of oxidative coupling of methane for preparation of ethylene and dry reforming of methane for preparation of synthetic gas. The coupled process comprises thefollowing concrete process: introducing raw gas containing methane and oxygen into a methane oxidative coupling reactor, allowing the methane and the oxygen to undergo a catalytic reaction so as to generate CO, CO2, H2O, C2H4 and the like, allowing reacted gas to pass through cooling and separating units so as to separate the C2H4 and obtain mixed gas mainly containing CH4, CO, CO2 and H2, preheating the mixed gas, then introducing preheated mixed gas into a dry reforming reactor, and allowing CO2 and CH4 to be catalytically converted into the synthesis gas; and allowing gas leaving from a dryreforming reactor to undergo a cooling and separation process so as to obtain the synthesis gas mainly composed of CO and H2, and sending unreacted CO2 back to the inlet of the dry reforming reactor.According to the invention, the methane oxidative coupling reactor wraps the methane dry reforming reactor, so reaction space is independent, and the target products are convenient to separate; and the process of preparation of the ethylene by oxidative coupling of the methane is an exothermic reaction, and the process of preparation of the synthesis gas by dry reforming is an endothermic reaction, so direct heat transfer is performed in the processes of two reactions, and a large amount of energy is saved.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a coupling process of methane oxidative coupling to ethylene and methane dry reforming to synthesis gas. Background technique [0002] As the most important basic organic chemical raw material, the production of ethylene has been relying on the petroleum cracking route for a long time. The increasing depletion of crude oil resources and the rise in crude oil prices have led to an increase in the price of ethylene cracking raw materials. At the same time, the shortage of ethylene cracking raw materials is also very prominent. Therefore, all countries in the world are adjusting their energy utilization structures and constantly looking for new ethylene production routes. Natural gas is an important energy source, and its abundant reserves provide a good guarantee for its application in chemical industry. Therefore, the substitution of natural gas for petroleum synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/84C07C11/04C01B3/38
CPCC01B3/38C01B2203/0238C01B2203/062C01B2203/0844C01B2203/1276C07C2/84C07C2523/34C07C11/04
Inventor 李娜王永刚蒋晶邓波
Owner LUOYANG INST OF SCI & TECH
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