What is shot coke?

Shot coke is composed of precipitated asphaltenes. Asphaltenes are large hydrocarbon molecules that are dispersed in the lighter aromatic and paraffinic oils in vacuum residuum.

When these lighter molecules thermally crack and vaporize in the coke drum, the asphaltenes agglomerate and precipitate out of solution. The coke is called shot coke because the precipitated asphal­tenes take the form of hard, spherical particles.

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