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Method for producing acetylene for cracking natural gas by micro discharge

A technology of natural gas and acetylene, which is applied in the field of micro-discharge cracking of natural gas to produce acetylene, which can solve the problems of high energy consumption and short electrode life, and achieve the effects of reducing energy consumption, solving stability problems, and improving methane conversion rate and

Inactive Publication Date: 2007-10-10
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

Although this process has been greatly improved compared with the conventional thermal arc plasma cracking natural gas to acetylene process, there are also problems with relatively short electrode life, high energy consumption, and stable operation due to electrode ablation.

Method used

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  • Method for producing acetylene for cracking natural gas by micro discharge

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Embodiment Construction

[0032] Specific embodiments of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.

[0033] Step 1. In the plasma reactor 8 in the figure, a dielectric barrier discharge component is placed, wherein the metal-processed discharge electrode 5 is coated with a thin dielectric layer 7 on the periphery, and the ground electrode 6 made of metal is close to the reactor box. On the other side, a thin layer of dielectric layer is coated with a thickness of 0.2 mm to 1 mm, and a discharge gap 9 is formed between the discharge electrode and the ground electrode, and the distance is 0.2 to 2 mm.

[0034] Step 2. The frequency of the medium-frequency high-voltage power supply 4 in Figure 1 is 400 Hz to 10 kHz, and the high voltage delivered is applied to the discharge electrode 5 through the insulator 10, and a strong ionization discharge electric field is established with the ground electrode 6, and a high-voltage disch...

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Abstract

This invention discloses a method for preparing acetylene by micro-discharge pyrolysis of natural gas. The conversion rate of methane is higher than 70%. The selectivity of acetylene is 80-90%. The selectivity of C2 is 85-95%. The energy consumption of acetylene is lower than 10 kWh / kg. The method can avoid electrode ablation problem faced by acetylene preparation by plasma pyrolysis of natural gas. Besides, the method lowers the energy consumption, and increases the conversion rate of methane as well as the selectivity of acetylene. The method can also be used in synthesis of other novel organic and inorganic matters.

Description

technical field [0001] The invention belongs to the technical fields of gas ionization discharge, atmospheric pressure plasma physics, organic chemistry and the like, and relates to a method for producing acetylene by cracking natural gas with micro-discharge. Background technique [0002] With the decrease of petroleum resources, the research on the direct conversion of natural gas to C2 hydrocarbons and other high value-added chemical products has become a common concern of the industrial sector. The main component of natural gas is methane. Due to the stable molecular structure of methane, the activation and conversion of methane must be realized by conventional catalytic means at high temperature, and the high reaction temperature leads to a decrease in the stability of the catalyst and a low yield of the target product. Difficult to realize industrial application. [0003] As early as the 1940s, arc plasma technology had been applied to the process of direct conversion...

Claims

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Application Information

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IPC IPC(8): C07C4/02C07C11/24
Inventor 白敏冬张芝涛白敏菂杨波薛晓红白希尧
Owner DALIAN MARITIME UNIVERSITY
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