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Ethylene and diethylene are two common chemicals that play important roles in industrial production. Ethylene has the molecular formula C2H4 and is a colorless, flammable gas commonly used in the production of chemical products such as plastics, rubber, solvents, etc. 

And the molecular formula of diethylene is C4H6, which is a colorless liquid mainly used for synthesizing rubber and resin. Although they have similarities in name, there are significant differences in chemical properties and application fields. Ethylene is the simplest unsaturated hydrocarbon and an important petrochemical raw material. 

It is widely used in industry to synthesize ethylene polymers, such as polyethylene and PVC. Diethylene is widely used in the rubber and resin industries, such as in the production of butyrate rubber and butyl rubber. In industrial production, ethylene is an important basic chemical raw material, and its preparation is mainly achieved through processes such as petroleum hydrocracking or ethane oxidation. 

The production of ethylene is usually obtained through the dimerization reaction of ethylene. Although they have different uses in industrial applications, they are all important chemical raw materials and are of great significance for promoting the development of the chemical industry. In addition to their applications in industrial production, ethylene and diethylene also have important applications in other fields. 

For example, ethylene can also be used to produce chemicals such as ethylene alcohols and acetaldehyde, while diethylene can be used to synthesize amino substituted hydrocarbons and insecticides. 

Therefore, ethylene and diethylene play important roles in the chemical industry and other fields, and are of great significance in promoting social and economic development. 

In summary, ethylene and diethylene have significant differences in chemical properties, industrial applications, and preparation processes, and each plays an important role in the chemical industry, making significant contributions to the development of the chemical industry.