The feed stream is generally made of any petroleum stream that is in need of further treatment. Straight-run naphthas, which are intermediate hydrocarbon streams, are the most prevalent feeds for hydrotreaters. Naphthas are obtained from refining crude oil, coal tars, a distillation of wood, or coal gasification. Due to this wide variety of sources, as well as the unique chemical makeup of crude oil from various regions, the composition of naphthas differs significantly (Lawrie 225).
Middle distillates such as diesel, kerosene, and jet fuel are also used as feed. Hydrotreatment in this case aims to remove sulfur mostly for environmental reasons (Maples 250). In addition to this, the process increases the cetane number by hydrogenating aromatic components in the feed. Cracked gasoline can also be used as a feed. When this fuel is used, the aim of the process is to hydrogenate undesirable sulfur and nitrogen compounds contained in the cracked gasoline.
Fuels derived from renewable organic material are also used as feed for hydrotreaters. Hydrotreatment is necessary to convert the feedstock obtained from renewable organic matter into fuels that can be used in vehicles.
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