Destructive Distilliation
Destructive distillation means driving off (and collecting) gas from some matter by heating it in the absence of air. This is the process called 'coking ' when referring to the transformation of bituminous coal into coke (at 1,000 C).
Examples of substances that are commonly destructive distilled to extract chemicals and other materials include:
- Wood
- Soft coal
Examples of substances extracted include:
- Acetic acid
- Methyl or wood alcohol
- Coal gas
- Tar
Other types of distillation include:
- Fractional distillation
- Simple distillation
Related Information
Coal tar pitch volatiles (CTPV) are the result of destructive distillation of bituminous coal. They contain polynuclear aromatic hydrocarbons (PNA's). PNAs sublime readily and cause carcinogenic compounds in working areas. Evidence suggests that workers exposed to products of combustion or distillation of bituminous coal are at increased risk of cancer.
