High-frequency plasma natural gas cracking process of synthesizing C2 hydrocarbon

Abstract

The present invention is high-frequency plasma natural gas cracking process of synthesizing C2 hydrocarbon. After natural gas with methane content of about 90% is fed into reactor with specific electrodes via flowmeter, high-frequency power supply of 500 W-100 KW power and 1-25 MHz frequency is applied to the electrodes, vacuum inside the reactor is regulated to 0.001-0.1 MPa and power supply output power is regulated to produce stable glow discharge and produce plasma, so that methane is stimulated inside the plasma region to produce great amount of active free radicals CH3, CH2 and CH, which form new C2 hydrocarbon via collision. The process has methane converting rate of 24.02-77.5 %, C2 hydrocarbon yield of 20.50-76.79 % and C2 hydrocarbon selectivity of 85.35-98.96 %. The product is made to enter the storing tank via a vacuum pump.

Description

1. Technical field [0001] The invention relates to a high-frequency plasma cracking natural gas synthesis C 2 The method for hydrocarbons belongs to the field of synthesis of low-molecular substances. 2. Background technology [0002] The world, especially my country, is rich in natural gas reserves, but oil reserves are increasingly scarce. Although, natural gas can now be used as the basic raw material for synthetic ammonia, methanol, acetic acid and acetylene and other chemical products. However, it is limited by the existing natural gas chemical technology: such as complex process, high temperature multi-step reaction, huge investment, excessive reliance on expensive catalysts, etc., and it is still unable to effectively obtain the most important basic organic chemical raw materials and macromolecular monomers... ethylene, etc. Alkenes. Therefore, it is necessary to vigorously develop the conversion of natural gas to prepare C 2 hydrocarbon method. [0003] Since th...

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Problems solved by technology

However, when the gas is discharged, due to the high reaction temperature and high energy density during the discharge process, it is easy to completely crack methane and generate a large amount of carbon deposits, which adhere to the reactor and change the impedance of the resonant cavity. When the power frequency is fixed, the output power does not match, so it cannot produce a good microwave effect, and carbon deposits need to be cleaned, which complicates the whole process and is not conducive to industrial production; on the other hand, the microwave power is not very high , compared with similar high-power plasma generating equipment, the cost is expensive, which is also the reason why it cannot be developed on a large scale; in the microwave process, although the conversion rate of methane is high, the C 2 The yield of hydrocarbons is not too high, which is also the weak point of this patent

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