It is possible in principle but I have never personally have use. Aromatic hydrocarbons can be separated from alkanes by extraction (N-methylpyrrolidone is industrial solvent for this). If you need only alkanes , reaction with HSO3Cl is useful - allow to stay mix on one week , or with overernight stirring. After water washing of upper layer, it contain only saturated hydrocarbons.

Thanks sir. what if the one I need is just n-alkanes?

Some examples are described in J.March textbook (n-octane build clathrate with urea but 2-methyloctane (and 2-methylheptane) are not. Diameter of channels in urea is near 5Å ( angström ), so your hypothesis seems to be plausible.

For separation of minute amounts of volatile compounds, preparative gas chromatography is very suitable (if available)

Thankyou very much sir