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What is destructive distillation
A form of distillation involves heating the substances such as wood, coal, and oil shale in the absence of air  and collecting separately the portions comes out; this is known as destructive distillation. Wood, for example, when treated in this way yields acetic acid, methyl or wood alcohol, charcoal, and a number of hydrocarbons. Coal yields coal gas, coal tar, ammonia, and coke. Ammonia is also obtained by the destructive distillation of oil shale.


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