amir farshi - engineering department research institute of petroleum industry
mohammad ayazi
alireza khaleghnasab

Hydrocracking is a catalytic cracking process assisted by the presence of an elevated partial pressure of hydrogen gas similar to the hydrotreater, the function of hydrogen is the purification of the hydrocarbon stream from sulfur and nitrogen hetero -atoms. the products of this process are saturated hydrocarbons ; depending on the reaction conditions temperature, prssure, catalyst activity these products range from ethane , LPG to heavier hydrocarbons comprising mostly of isoparaffins.hydrocracking is normally facilitated by a bi functional catalyst that is capable of rearranging and breaking hydrocarbon chains as well as adding hydrogen to aromatics and olefins to produce naphthenes and alkanes. major products from hydrocracking are jet fuel and diesel, while also high octane rating gasoline fractions and LPG are produced . all these products have a very low content of sulfur and other contaminants. it is very common in india , europe , asia and iran because those regions have high demand for diesel and kerosene . in the US, fluid catalystic cracking is more common because the demand for gasoline is higher the ole technology of this process was according to high pressure technology maximum pressure is 200 bar.