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Method for preparing acetylene by cracking waste grease with thermal plasma

A technology of thermal plasma and waste oil, which is applied in the direction of hydrocarbon cracking, hydrocarbon production from oxygen-containing organic compounds, organic chemistry, etc., can solve the problems of large environmental pollution and high energy consumption, and achieve good adaptability and high utilization rate of raw materials High, solve the effect of flowing into the food market

Active Publication Date: 2015-02-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industrial methods for producing acetylene mainly include calcium carbide method, methane partial oxidation method and methane arc cracking method, among which the calcium carbide method is mature in industry and accounts for an absolute proportion in industrial production, but a large amount of CO will be produced during the production process. 2 and Ca(OH) 2 and other industrial waste gas and waste, which pollute the environment greatly and consume a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Pass hydrogen into the DC arc plasma generator with an input power of 45kW, and form a hot plasma jet above 3000K after arcing. The expired soybean salad oil is atomized through the nozzle at a speed of 5kg / h by the plunger pump, mixed with hydrogen, and then enters the high temperature zone of the reactor. The cooling medium is radially passed into the quencher to quickly cool the cracked gas to 360K, and the cooling rate is 2×10 -7 K / s, the cracked gas containing acetylene is obtained, and acetylene is obtained after absorption and separation.

[0027] The yield of reaction product acetylene was 72.0% and the conversion rate of waste oil was 99.6% through gas chromatography detection and analysis and calculation.

Embodiment 2

[0029] Pass hydrogen into the DC arc plasma generator with an input power of 50kW, and form a hot plasma jet above 2500K after arcing. The gutter oil with a water content of 5% is filtered, atomized by a plunger pump at a speed of 5kg / h through a nozzle, mixed with hydrogen, and then enters the high temperature zone of the reactor. into the quencher, using water as the cooling medium, tangentially passing into the quencher to quickly cool the cracked gas to 400K, and the cooling rate is 2×10 -7K / s, the cracked gas containing acetylene is obtained, and acetylene is obtained after absorption and separation.

[0030] The yield of reaction product acetylene was 78.5% and the conversion rate of waste oil was 99.2% through gas chromatography detection and analysis.

Embodiment 3

[0032] The mixed gas of argon and hydrogen is passed into the DC arc plasma generator with an input power of 15kW, and a thermal plasma jet above 2500K is formed after arcing. The waste lubricating oil is filtered, atomized by a plunger pump at a speed of 1.5kg / h through a nozzle, mixed with argon gas, and enters the high-temperature zone of the reactor. Using waste lubricating oil and water as the cooling medium, they are radially passed into the quencher in turn to quickly cool the cracked gas to 400K, 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.

[0033] The yield of reaction product acetylene was 70.7% and the conversion rate of waste oil was 98.8% through gas chromatography detection and analysis.

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Abstract

The invention discloses a method for preparing acetylene by cracking waste grease with thermal plasma. The method comprises the following steps of: introducing a working gas to a plasma generator, and forming thermal plasma jet after arcing; and filtering and atomizing the waste grease, mixing the waste grease with a delivered gas, introducing the mixture to the thermal plasma jet in the plasma generator, performing millisecond cracking reaction, and quenching with a cooling medium to obtain cracked gas containing acetylene. The working gas is one or more of hydrogen, argon and nitrogen; the delivered gas is one or more of hydrogen, argon and nitrogen, and can be the same as or different from the working gas; and the cooling medium is one or more of water, hydrogen and waste grease serving as raw materials. According to the method, the waste grease is used as a raw material, so that high value-added utilization of the waste grease is realized, and environmental pollution is reduced; and the method is short in process flow, environment-friendly, economic, efficient, high in utilization rate of the raw materials and high in yield of the acetylene product.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a method for preparing acetylene by thermal plasma cracking waste oil. Background technique [0002] The largest part of waste oil is waste edible oil, and a large amount of waste edible oil will be produced during the production, processing and use of edible oil and meat. Taking edible oil as an example, the annual consumption of various edible oils in my country is 30 million tons, and the highest utilization rate is 85%. The annual waste oil produced by my country's catering industry is as high as 2.25 million tons. In addition, a large amount of waste industrial grease, such as waste lubricating oil and engine oil, will be produced in the process of industrial production. These waste oils not only cause serious environmental pollution, but also easily cause various social problems. [0003] Due to the lack of a sound recycling and reuse system for waste oil, only a small a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/24C07C1/20C07C4/02
Inventor 苏宝根任其龙邢华斌闻光东鲍宗必张治国杨启炜杨亦文
Owner ZHEJIANG UNIV
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