11. As carbon rejection is very inefficient and wasteful in most cases, catalytic hydrocracking is preferred in most cases. 12. Dicoronylene was later discovered to occur as a by-product of the catalytic hydrocracking used in petroleum processing. 13. Synthetic zeolites are widely used as catalysts in the petrochemical industry, for instance in fluid catalytic cracking and hydrocracking . 14. The hydrogen produced is often used as an intermediate product for other oil refinery processes such as hydrocracking and hydrodesulfurization. 15. These include hydrocracking , hydrogenation, alkylation ( S N 2 ), oxidation, metalation and nucleophilic aromatic substitution. 16. The major products from hydrocracking are jet fuel and diesel, but low sulphur naphtha fractions and LPG are also produced. 17. Perrhenic acid combined with platinum on a support gives rise to a useful hydrogenation and hydrocracking catalyst for the petroleum industry. 18. "' Vegetable oil refining "'is a process to transform vegetable oil into biofuel by hydrocracking or hydrogenation. 19. The 17, 820-barrel-a-day hydrocracking unit will be down about two weeks, according to the filing. 20. The hydrocracking process depends on the nature of the feedstock and the relative rates of the two competing reactions, hydrogenation and cracking.
