High Severity Fluidized Catalytic Cracking (HS-FCC) – Go for Propylene!
- Iwao Ogasawara (JX Nippon Oil & Energy Corporation)
- Document ID
- World Petroleum Congress
- 21st World Petroleum Congress, 15-19 June, Moscow, Russia
- Publication Date
- Document Type
- Conference Paper
- 2014. World Petroleum Council
- HS-FCC, down flow reactor, short contact time, bottom to chemical
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- 85 since 2007
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The Fluid Catalytic Cracking (FCC) process has undergone a long evolution of hardware and catalyst changes from bed cracking with amorphous catalyst to short contact time riser cracking with sophisticated zeolite catalyst systems. Improvements to the process have provided a wide degree of flexibility to selectively target production of distillates , gasoline or propylene from VGO and residue feeds thereby making the FCC the most widely used conversion process. More generally, the objective of the process is to produce high valued products including fuels and petrochemicals such as light olefins and aromatics.
Worldwide propylene demand is set to increase and outpace the growth rate of ethylene. This market development will apply considerable pressure on refiners and olefin producers and cannot be ignored. Traditionally, propylene is a byproduct from on purpose ethylene production, especially steam crackers. In the Middle East most steam crackers using ethane as a feed causes a heavily ethylene centered imbalance in this region. In order to address the general lack of propylene from steam crackers, on purpose propylene production technologies, such as propane dehydrogenation, metathesis or High Severity FCC have been developed recently.
An alliance comprising of JX Nippon Oil & Energy Corp. (JX), Saudi Aramco and King Fahd University of Petroleum and Minerals has developed the HS-FCC process which is able to produce around 20 wt% of propylene by converting heavy hydrocarbon feedstock under severe FCC conditions, using a novel downflow reactor system. A 3,000 BPSD HS-FCC semi-commercial plant has been operated at the JX Mizushima Refinery in Japan since May 2011. Combined light olefins (C2-C4) yields of 35 to 40 wt% have been demonstrated with 17 to 20 wt% of propylene yields for several feedstocks including hydrotreated residue. HS-FCC product portfolio can be further increased towards propylene and aromatics by further downstream conversion of its less desired products, using proven technology approaches.
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