Also known as: coke, refinery coke, petroleum coke
In an FCC, coke forms on the catalyst and is burned off as fuel for the FCC process, resulting in no net production of coke as a product.
In a delayed coker, resid is thermally cracked to produce lighter, more desirable products. In the process, a significant portion of the feed (~15% of volume) is converted into elemental carbon called petroleum coke. Refiners separate the coke from the other coker products and sell it as a product.
The primary end use for pet coke is as a solid fuel, used as a substitute for coal in furnaces and boilers. The value of the coke as a product is typically far below the cost of the crude oil used to produce it.