dry distillation


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dry distillation

[¦drī dis·tə′lā·shən]
(chemistry)
A process in which a solid is heated in the absence of liquid to release vapors or liquids from the solid, for example, heating a hydrate to produce the anhydrous salt.
References in periodicals archive ?
Composition of oil shale, % Dry distillation product of oil shale Shale oil Water Gas Semicoke 7.55 6.3 5.59 80.56 Inorganic composition of oil shale Si[O.sub.2] [Al.sub.2][O.sub.3] CaO [Fe.sub.2][O.sub.3] MgO 53.1 11.3 8.1 7.63 1.17 Inorganic composition of oil shale [Na.sub.2]O [K.sub.2]O Ti[O.sub.2] [P.sub.2][O.sub.5] MnO 0.56 1.14 0.82 0.2 0.19 Note: Dry distillation products of oil shale were determined by Fischer assay according to ISO 647-74.
In the retort furnace, the heat is provided by combustion of dry distillation gas and char.
The gases that escape by the dry distillation of additives in the absence of air are volatiles.