Propylene Catalytic Cracking PCC

The ExxonMobil Process is a new fluid solids naphtha cracking 

The feed can be obtained from cat naphtha, coker naphtha, and steam cracker s C4 s and pyrolysis gasoline. The largest source of olefinic feedstock molecules is cat naphtha, which contain 20-60% olefins. Most of linear cat naphtha olefins are converted to light olefins, and at the same time, an increased octane and reduced olefin content naphtha is produced by the concentration of higher octane aromatics, plus isomerization and some additional aromatics formation. 

Reactor effluent is cooled and vapors are compressed for product recovery. Once-through yields of ethylene and propylene typically are in the range of 10-20 wt.% and 30-40 wt.% on feed olefin content, respectively. The propylene s concentration is ranging from 85% to 90% and can be further purified to supply as polypropylene feed. Ethylene can also be recovered in order to achieve maximiun economic benefit. Butylenes can be recovered as product, or can be recycled (optionally with unconverted C5+) for additional propylene production. 

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