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Method for preparing acetylene by cracking industrial byproduct gas with rotating arc plasma

An industrial by-product, plasma technology, which is used in chemical instruments and methods, condensation of dehydrogenated hydrocarbons, hydrocarbons, etc., can solve the problem of short anode life, incomplete mixing of raw materials and plasma jets, temperature The problem is that the field and flow field are not uniform enough to achieve the effect of reducing pollution, low specific energy consumption, and no need for catalysts.

Active Publication Date: 2013-10-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned patent documents all use the thermal plasma cracking method to prepare acetylene, and there are problems such as the temperature field and the flow field are not uniform enough, the life of the anode in the plasma generating device is short, and the mixing of the raw material and the plasma jet is not complete enough.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]The hydrogen gas is passed into the plasma generator, and the rotating arc plasma is formed after the arc is started, and the input power is 920kW. The dry gas after deethylene is used as the raw material, pre-mixed with the working gas hydrogen, and then passed into the high-temperature region of the rotating arc plasma (the H:C molar ratio after the hydrogen gas is mixed with the dry gas is 6.6), and after a millisecond cracking reaction, Pass the generated cracked gas into the quencher, use water as the cooling medium, and quickly cool the cracked gas to 360K with a cooling rate of 3×10 7 K / s, the cracked gas containing acetylene is obtained, and acetylene is obtained after absorption and separation.

[0033] Through gas chromatography detection and analysis calculation, the conversion rate of hydrocarbons in raw materials is 96.6%, the yield of reaction product acetylene is 82.2%, and the specific energy consumption of acetylene is 8.9kWh / kg.

Embodiment 2

[0035] The dry gas after deethylene is passed into the plasma generator, and the rotating arc plasma is formed after the arc is started, and the input power is 460kW. Using the dry gas after deethylene as the raw material (the H:C molar ratio of the dry gas after deethylene is 3.7), it is directly passed into the high temperature zone of the rotating arc plasma, and after millisecond cracking reaction, the cracked gas produced Pass into the quencher, use water as the cooling medium, quickly cool the cracked gas to 360K, and the cooling rate is 3×10 7 K / s, the cracked gas containing acetylene is obtained, and acetylene is obtained after absorption and separation.

[0036] According to gas chromatography detection and analysis calculation, the conversion rate of hydrocarbons in raw materials is 95.3%, the yield of reaction product acetylene is 49.2%, and the specific energy consumption of acetylene is 7.7kWh / kg.

Embodiment 3

[0038] The coke oven gas is passed into the plasma generator, and the rotating arc plasma is formed after the arc is started, and the input power is 860kW. The above-mentioned coke oven gas is used as raw material (the H:C molar ratio of coke oven gas is 5.6), which is directly passed into the high temperature zone of the rotating arc plasma, and after millisecond cracking reaction, the cracked gas generated is passed into the quencher , using water as the cooling medium, rapidly cooling the cracked gas to 420K, the cooling rate is 3×10 7 K / s, the cracked gas containing acetylene is obtained, and acetylene is obtained after absorption and separation.

[0039] Through gas chromatography detection and analysis calculation, the conversion rate of hydrocarbons in the raw material is 96.8%. The yield of the reaction product acetylene is 82.7%, and the specific energy consumption of acetylene is 11.1kWh / kg.

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Abstract

The invention discloses a method for preparing acetylene by cracking industrial byproduct gas with rotating arc plasma, which comprises steps as follows: working gas is introduced into a plasma generator through an annular channel between a cathode and an anode, and forms rotating arc plasma after arc starting; industrial byproduct gas and the working gas are mixed, and pass through a high-temperature region of the rotating arc plasma to generate millisecond cracking reaction; and the obtained cracking reaction product is quenched by a cooling medium to obtain acetylene-containing cracked gas, and the acetylene-containing cracked gas is separated to obtain acetylene. The industrial byproduct gas is a hydrocarbon-containing gas mixture; the working gas is one or more of hydrogen, argon and industrial byproduct gas; and the cooling medium is water, hydrogen or industrial byproduct gas. By preparing the acetylene from the raw material industrial byproduct gas, the invention implements high-added-value recycling of the industrial byproduct gas; and the invention has the advantages of short technical process, environment friendliness, high economy, high efficiency, high raw material convention rate, high yield of the product acetylene, and low specific energy consumption.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a method for preparing acetylene by rotating arc plasma cracking industrial byproduct gas. Background technique [0002] In the production process of coal chemical industry and petrochemical industry, a large amount of industrial by-product gases, such as coke oven gas and dry gas, will be produced. [0003] Coke oven gas is the main by-product of the coking industry, its main components are hydrogen and methane, and also contains a small amount of CO, CO 2 , N 2 , O 2 and other hydrocarbon components. According to statistics, the annual output of coke in my country is 440 million tons, and every ton of coke produced can produce 430 cubic meters of coke oven gas. 3 , Excluding the part used by the coking plant and used as gas supply, a large amount of coke oven gas is burned directly every year. [0004] Dry gas is a by-product gas produced in the catalytic cracking process...

Claims

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Application Information

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IPC IPC(8): C07C11/24C07C6/00C07C2/80
Inventor 任其龙苏宝根邢华斌闻光东鲍宗必张治国杨启炜杨亦文马杰房建威
Owner ZHEJIANG UNIV
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