Hydrotreati

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Meena Abdul-Nabi Marafi has written:

'The regeneration of deactivated hydrotreating catalysts'

Mixing disulfide oil with fuel oil without further sulfur treating is potentially undesireable as combustion leads to the production of sulfur-containing pollutants. Disulfide oils are generally produced as byproducts of gas sweetening--a process where sulfur is removed from liquid petroleum gas (LPG). Separating disulfide oil into hydrocarbons (oil) and sulfur (disulfide) requires hydrotreating. After hydrotreating, the hydrocarbons can be blended with other fuel oils.

Hydrotreating reaction is an exothermic reaction. The total reaction provides excess reaction heat; more is produced by the exothermic hydrogenation reactions than are required to support the endothermic cracking reactions.High Olefin conc. leads to high temp. rise due to hydrogenation reaction.This excess heat increases the reactor temperature and accelerates the reaction rate. Temperature rise can be controlled by injecting cold hydrogen or cold recycled quench into the reactors to absorb excess reaction heat.