Butane is a gaseous component of natural gas in the same manner as gasoline is a component of crude oil.
While petroleum products like gasoline are refined, natural gas products like butane are extracted. Butane can also be produced from crude oil, but in much smaller quantities.
Normal butane is a hydrocarbon obtained from natural gas or by refining petroleum. It can be liquefied at room temperature by compression.
There are two structural isomers of butane: In normal butane, or n-butane, the four carbon atoms are joined in a continuous, unbranched chain; in isobutane (or 2-methylpropane) three of the carbon atoms are joined to the fourth by single bonds, resulting in a branched structure.
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