Application of gas hydrogen in petroleum industry

It need to add hydrogenation and by de-sulfur and hydrogenation cracking to extract crude oil, petroleum refining process need to add hydrodesulfurizer.
The amount of hydrogen used in the petroleum industry is second only to synthetic ammonia. Hydrogen is mainly used for naphtha hydrodesulfurization, gas oil hydrodesulfurization, fuel oil hydrodesulfurization, improved flame height and hydrocracking of aircraft fuels, etc field. Hydrogen is mainly used for C3 fractions hydrogenation, gasoline hydrogenation C6-C8 fraction hydrodealkylation and the production of cyclohexane and so on.
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(source:http://www.airseparation-plant.cn/application-of-gas-hydrogen-in-petroleum-industry/)