C5 hydrocarbon

C5 hydrocarbons, which are hydrocarbon compounds containing five carbon atoms, mainly come from the following sources:

Petroleum processing process

1. Reforming unit: During the reforming process of petroleum processing, pre hydrogenated topping oil is produced, which contains abundant C5 hydrocarbons, especially high content of pentane (such as n-pentane and isopentane).

2. Ethylene cracking unit: Ethylene cracking unit is one of the important sources of C5 hydrocarbons. During this process, cracking gas is generated, which can be separated to obtain C5 fractions rich in pentadienes (such as dicyclopentadiene, isoprene, and meta pentadiene), pentane, and other olefins.

Coal chemical process

1. Coal to olefin plant: In the process of coal to olefin production, C5 hydrocarbons are also produced, mainly olefins, and are therefore also known as high olefin C5.

2. Coal to naphtha unit: Coal to naphtha unit can also produce C5 hydrocarbons, and the content of pentane in the C5 fraction is usually high, generally above 80%.

Other sources

1. Light coal tar: C5 hydrocarbons such as cyclopentadiene can also be recovered from light coal tar. It is estimated that 10-20 kilograms of cyclopentadiene can be recovered from every 1000 tons of light coal tar.

2. Wax cracking process for producing alpha olefins: In this process, C5 hydrocarbon compounds such as pentene fractions can be obtained.

Chemical synthesis

In addition to extracting from the aforementioned natural resources, C5 hydrocarbons can also be obtained through chemical synthesis methods. For example, isoprene can be synthesized through various chemical methods, such as the aldehyde synthesis method of isobutene formaldehyde, the Prins synthesis method of acetylene acetone, and the propylene dimerization decomposition method.

Overall, the sources of C5 hydrocarbons are relatively concentrated, mainly from petroleum processing and coal chemical processes. These C5 hydrocarbon fractions from different sources have their own characteristics and compositions, providing a rich raw material foundation for subsequent separation, purification, and deep processing.