Hydrocracking is a two-stage process combining catalytic cracking and hydrogenation wherein distillate, fractions are cracked. In the presence of hydrogen and special catalysts to produce more desirable products. Hydrocracking has an advantage over. Catalytic cracking in that high-sulphur feedstocks can be processed without previous desulphurization. In, the process heavy. Aromatic feedstock is converted into lighter products under very high pressures and fairly high temperatures. When the feedstock. Has a high paraffinic content the hydrogen, prevents the formation of PAHs reduces tar, formation and prevents build-up. Of coke on the catalyst. Hydrocracking produces relatively large amounts of isobutane for alkylation feedstocks and also. Causes isomerization for pour point control and smoke, point control both of which are important in high-quality jet fuel.
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