Petroleum ether ( aka petroleum spirits ) is a narrow alkane hydrocarbon distillate fraction from crude oil.
The names "ether" and "spirit" refer to the very volatile nature of the solvent, and petroleum ether does not have the ether ( Cx-O-Cy ) linkage, but solely consists of hydrocarbons.
Petroleum ethers are defined by their boiling range, and that is typically 20C.
Typical fractions are 20-40C, 40-60C, 60-80C, 80-100C, 100-120C etc. up to 200C.
There are specially refined grades that have any aromatic hydrocarbons removed, and there are specially named grades, eg pentane fraction (30-40C), hexane fraction (60-80C, 67-70C).
It is important to note that most "hexane" fractions are mixtures of hydrocarbons, and pure normal hexane is usually described as "n-hexane".
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