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[Chemical Knowledge]：Ethylene production and manufacturing methods and processes.

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Ethylene manufacturing method

Ethylene is an important raw material for chemical production, which is widely used in the production of polymers, plastics, solvents, surfactants and other fields. Therefore, it is of great significance to study the manufacturing method of ethylene for improving the production efficiency and quality of chemical products. This article will introduce several common ethylene manufacturing methods.

1. Steam cracking

Steam cracking is the main method of ethylene production at present, the principle of which is to crack hydrocarbons under the conditions of high temperature, high pressure and water vapor to produce ethylene and other low-carbon olefins. This method has the advantages of wide source of raw materials, simple operation and high production efficiency, so it is widely used in ethylene production. The process of

steam cracking mainly includes the steps of raw material pretreatment, cracking reaction, product separation and purification. Feedstock pretreatment mainly converts hydrocarbons into forms suitable for cracking reactions, such as naphtha and light diesel oil. The cracking reaction is generally carried out under the conditions of high temperature, high pressure and the presence of water vapor, and the reaction produces low-carbon olefins such as ethylene and propylene. Product separation and purification is mainly through fractionation, absorption, removal and other methods to separate ethylene from the mixture, and remove impurities.

2. Ethanol dehydrogenation

Ethanol dehydrogenation is a method for producing ethylene through ethanol dehydrogenation reaction. The method is under the condition of high temperature, high pressure and the presence of catalyst, the ethanol is dehydrogenated to produce ethylene and water vapor. Ethanol dehydrogenation has the advantages of easy access to raw materials, mild reaction conditions and high product purity, so it has been applied in some specific fields. The process flow of

ethanol dehydrogenation mainly includes the steps of ethanol preheating, dehydrogenation reaction, product cooling and separation. The preheating of ethanol is mainly to heat the ethanol to the reaction temperature, and the dehydrogenation reaction is generally carried out under the conditions of high temperature, high pressure and the presence of a catalyst, and the reaction generates ethylene and water vapor. Product Cooling and Isolation The ethylene is separated from the mixture primarily by cooling and fractionation.

3. Hydrocarbon Oxidation

Hydrocarbon oxidation is a process for the production of ethylene by the oxidation of hydrocarbons. The process is the oxidation of hydrocarbons to ethylene and other oxides at high temperature, high pressure and in the presence of a catalyst. Hydrocarbon oxidation method has the advantages of wide source of raw materials, mild reaction conditions and high product selectivity, so it has been applied in some specific fields. The process flow of

hydrocarbon oxidation method mainly includes the steps of raw material preheating, oxidation reaction, product cooling and separation. The raw material preheating is mainly to heat the hydrocarbon compound to the reaction temperature, and the oxidation reaction is generally carried out under the conditions of high temperature, high pressure and the presence of a catalyst, and the reaction produces ethylene and other oxides. Product Cooling and Isolation The ethylene is separated from the mixture primarily by cooling and fractionation.

The above three methods are common ethylene manufacturing methods, each with its own advantages and disadvantages and scope of application. In actual production, the appropriate manufacturing method should be selected according to the source of raw materials, production scale, product quality and other factors. In addition, with the continuous progress of science and technology and the continuous improvement of environmental protection requirements, ethylene manufacturing methods are also constantly improved and optimized, more efficient and environmentally friendly manufacturing technology is applied to production, improve the production efficiency and quality of ethylene, and make greater contributions to the development of chemical production.

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