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Coking is an industrial process in which coal (or heavy petroleum residues) is heated to very high temperatures in the absence of air. This heating drives off volatile components and leaves behind a solid, carbon-rich material called coke.What happens during coking The raw material (usually coking coal or heavy oil residues) is heated to about 900–1100°C Because there’s no oxygen, the material doesn’t burn Volatile substances escape as gases and liquids (like coal tar, ammonia, and coke oven gas) What remains is coke — hard, porous, and rich in carbon

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