I would like to ask the teachers about the general properties of various petrochemical products; I’ve been working in the petrochemical industry for several years now yet still don’t know anything about them
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For example, what are the general processes for atmospheric pressure diesel and atmospheric pressure gasoline, as well as for catalytic diesel processing? What are the differences between catalytic gasoline, coker diesel, gasoline, and gasoline and diesel produced through hydroprocessing? Is it the higher sulfur content, or something else? How can one generally distinguish between them?
Gasoline consists of C5-C12 components; the gasoline and diesel produced through atmospheric and vacuum distillation have a relatively high degree of saturation as well as a higher proportion of straight-chain molecules. Therefore, atmospheric and vacuum distillation gasoline contains less olefins and aromatics, resulting in a lower octane rating, while diesel has a higher octane rating. Catalytic gasoline, being derived from the cracking of heavy oil, has a high content of olefins and aromatics, low saturation, poor stability, and contains significant amounts of thiol compounds that need to be removed through hydrogenation; it nevertheless has a relatively high octane rating.
Also, catalytic diesel has a relatively low cetane number, but a low freezing point. Hydrogenation is also required
Atmospheric pressure oil products are fractionated based on their boiling points; they are mostly saturated hydrocarbons, and the presence of impurities such as sulfur depends on the raw materials used. The remaining oils undergo secondary processing, with modification techniques such as catalysts and hydrogenation being employed to achieve the desired results. Is there any area of knowledge that isn’t taught by a mentor?