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Pyrolysis
Pyrolysis is the chemical decomposition of a condensed substance by heating. It does not involve reactions with oxygen or any other reagents but can take place in their presence. Pyrolysis is a special case of thermolysis, and is most commonly used for organic materials; extreme pyrolysis, which leaves only carbon as the residue, is called carbonization and is related to the chemical process of charring.
Pyrolysis often occurs spontaneously at high temperatures, for example in fires and when organic materials come into contact with lava in volcanic eruptions, and has been assumed to take place during catagenesis, the conversion of buried organic matter to fossil fuels. It is an important chemical process in several cooking procedures such as baking, frying, grilling, and caramelizing. Pyrolysis is also a tool of chemical analysis, for example by pyrolysis gas chromatography mass spectrometry and in carbon-14 dating. Indeed, many important chemical substances, such as phosphorus and sulfuric acid, were first obtained by this process. Pyrolysis is also the basis of pyrography.
Pyrolysis is heavily used in the chemical industry, for example, to produce charcoal, activated carbon, methanol and other chemicals from wood, to convert ethylene dichloride into vinyl chloride to make PVC, to produce coke from coal, to convert biomass into syngas, to turn waste into safely disposable substances, and for the cracking of medium-weight hydrocarbons from oil to produce lighter ones like gasoline.
Although water is normally excluded along with other reagents, the term has also been applied to the decompositon of organic material in the presence of superheated water or steam (hydrous pyrolysis), for example in the steam cracking of oil.
The word is coined from the Greek-derived elements pyro "fire" and lysys "decomposition".
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