section_path: Applications/Petrochemical industry
section_name: Petrochemical industry
paragraph_text: Petrochemical industry
  
  Large quantities of H are used in the "upgrading" of fossil fuels. Key consumers of H include hydrodesulfurization, and hydrocracking. Many of these reactions can be classified as hydrogenolysis, i.e., the cleavage of bonds by hydrogen. Illustrative is the separation of sulfur from liquid fossil fuels: