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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.
Coca, Cocaine, and Crack. Cocaine is a purified extract from the leaves of the Erythroxylum coca bush. This plant grows in the Andes region of South America. Different chemical processes produce the two main forms of cocaine: 1  Powdered cocaine -- commonly known on the street as coke or blow -- dissolves in water.2  Crack cocaine -- commonly known on the street as crack or rock -- is made by a chemical process that leaves it in its freebase form, which can be smoked.oca, Cocaine, and Crack. Cocaine is a purified extract from the leaves of the Erythroxylum coca bush. This plant grows in the Andes region of South America. Different chemical processes produce the two main forms of cocaine: 1  Powdered cocaine -- commonly known on the street as coke or blow -- dissolves in water.