Benzene hydrogenation process refers to removing heavy components from coking crude benzene, adding hydrogen into light components, reacting in a reactor at high temperature and high pressure under the action of a special catalyst, converting unsaturated diolefins and monoolefins into saturated hydrocarbons, and then removing impurities such as sulfur, nitrogen and oxygen by extractive distillation to obtain high-purity benzene and toluene.

Pure benzene is widely used in the production of fine chemical intermediates and organic raw materials. Besides disproportionation to produce benzene and xylene, toluene is mainly used to produce toluene diisocyanate, organic raw materials and a small amount of intermediates. In addition, it is also used as a solvent in coatings, adhesives, inks and pesticides.

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The application of xylene in chemical industry is mainly to produce terephthalic acid and phthalic anhydride, and the consumption as a solvent is also great. M-xylene is mainly used to produce terephthalic acid and m-phthalonitrile. Coking crude benzene mainly contains aromatic hydrocarbons such as benzene, toluene and xylene, as well as some impurities such as unsaturated compounds, sulfur compounds, oxygen compounds and nitrogen compounds.

Crude benzene refining is to remove the above impurities in crude benzene by chemical and physical methods, so as to obtain high-purity benzene which can be used as raw materials. Many coking projects have been launched in domestic iron and steel enterprises, and the output of coking crude benzene has increased rapidly, which provides rich raw materials for hydrofining crude benzene.

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