Editing Propylene (section)

===Fluid catalytic cracking===
High severity [[fluid catalytic cracking]] (FCC) uses traditional FCC technology under severe conditions (higher catalyst-to-oil ratios, higher steam injection rates, higher temperatures, etc.) in order to maximize the amount of propene and other light products. A high severity FCC unit is usually fed with gas oils (paraffins) and residues, and produces about 20–25% (by mass) of propene on feedstock together with greater volumes of motor gasoline and distillate byproducts. These high temperature processes are expensive and have a high carbon footprint.  For these reasons, alternative routes to propylene continue to attract attention.<ref>{{cite journal |doi=10.1016/j.joule.2017.07.008|title=Electrification and Decarbonization of the Chemical Industry|year=2017|last1=Schiffer|first1=Zachary J.|last2=Manthiram|first2=Karthish|journal=Joule|volume=1|issue=1 |pages=10–14|bibcode=2017Joule...1...10S |hdl=1721.1/124019|s2cid=117360588 |hdl-access=free}}</ref>