Destructive distillation

Destructive distillation is the process of pyrolysis conducted in a distillation apparatus to allow the volatile products to be collected. The process led to the discovery of many chemical compounds before such compounds could be prepared synthetically.

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A historically significant example of destructive distillation is tar making. Pinewood slices, which are rich in terpenes, are heated in an airless container causing the material to decompose. The by-products are turpentine and charcoal. This process is still used in Scandinavia for tar-making. Coal tar pitch volatiles (CTPV) are the result of destructive distillation of bituminous coal. These CTPVs often contain polynuclear aromatic hydrocarbons (PNA's), which sublime readily and are carcinogenic. Other examples of substances that are commonly destructively distilled to extract chemicals and other materials include:

Wood to give methanol, and guaiacol.
Coking' refers to the transformation of coal or heavy oil into coke, typically at temperatures near 1,000 °C.
Coal (lower grades) to give Coal gas

v • d • e Concepts in distillation
Principles	Raoult's law, Dalton's law, Reflux, Fenske equation, McCabe-Thiele method, Theoretical plate, Partial pressure, Vapor-Liquid Equilibrium
Industrial processes	Batch distillation, Continuous distillation, Fractionating column, Spinning cone
Laboratory methods	Rotary evaporator, Kugelrohr, Spinning band distillation
Techniques	Fractional distillation, Vacuum distillation, Extractive distillation, Reactive distillation, Dry distillation, Destructive distillation, Azeotropic distillation, Steam distillation, Salt-effect distillation