Petroleum

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Petroleum is a naturally occurring, yellowish-black liquid found in geological formations beneath the Earth's surface, used as fuel and raw material in the chemical industry.

In many countries, the word used for "petroleum" is "petrol", which, in English-speaking countries is used for gasoline. This may sometimes lead to confusion.

Composition

Components of petroleum are separated using a technique called fractional distillation, i.e. separation of a liquid mixture into fractions differing in boiling point by means of distillation, typically using a fractionating column.

Petroleum contains a variety of chemical compounds, such as:

  • Alkanes (paraffins): between 15 to 60%
  • Naphthenes: between 30 to 60%
  • Aromatics: between 3 to 30%
  • Asphaltics: <10%

Properties

Petroleum is a black viscous liquid, with a strong characteristic odor. It is immiscible with water.

Petroleum is flammable.

Availability

Raw petroleum is not sold, due to safety reasons, and the fact that is does not store well. Its purified components however, are much more available.

Preparation

Various methods of producing "bio-petroleum" have been developed over the years from biomass.

Projects

Handling and safety

Crude petroleum has benzene and other aromatics which are known to be carcinogenic.

Storage

Petroleum does not store well over long time, and should be used quickly.

See also

References

Relevant Sciencemadness threads