The reactions during the hydrotreatment process are mostly exothermic

The reactions during the hydrotreatment process are mostly exothermic. This means that the reactor temperature rises as new feed goes through the hydrotreater. A major reaction is desulphurization, which is the removal of sulfur from the feed by reacting a combination of the feed and hydrogen in the presence of a catalyst. This process requires high temperatures and hydrogen pressures. Another reaction is between Hydrogen and nitrogen compounds contained in the feed. The reaction takes place between Hydrogen and the Nitrogen compounds to form NH3 which can be removed together with other gaseous products. Reactions also occur between hydrogen and impurities such as coke and metals in the presence of a catalyst. This reaction results in the deposition of coke and mental compounds on the catalyst.