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A coker unit is a thermal cracking process in the oil refinery industry used to recover valuable elements, the most important of which being petroleum coke from main refinery process residues.
For other uses, see Refinery (disambiguation) . A refinery is a production facility composed of a group of chemical engineering unit processes and unit operations refining certain materials or converting raw material into products of value.he image below is a schematic flow diagram of a typical oil refinery depicting various unit processes and the flow of intermediate products between the inlet crude oil feedstock and the final products.