The best method is fractional distillation.
The process of obtaining pure petrol from crude oil involves distillation in a refinery. Crude oil is heated in a distillation tower, separating it into different components based on their boiling points. Petrol, which has a lower boiling point, is collected as a separate fraction and further processed to remove impurities, resulting in pure petrol.
distillation
>to get a pure sustance (such as water from sea water) >to separate alcohol from water to make distilled spirits such as vodka, >to extract essential oils from plants >to divide crude oil into all of its different components (paraffin, tar, and all of the other substances used as fuel that are extracted)
Allow the water to evaporate, leaving behind the salt would be effective for separating salt and water in a mixture.
Filtering
The process of obtaining pure petrol from crude oil is called refining. During refining, crude oil is processed in a refinery to separate and purify the various components, including petrol, through processes such as distillation and fractional distillation.
Fractional distillation is used in the petroleum industry to separate crude oil into different fractions such as gasoline, kerosene, and diesel based on their boiling points. Simple distillation is used in the beverage industry to separate ethanol from water in the production of alcoholic beverages like spirits, where ethanol has a lower boiling point compared to water.
isolation done with column chromatography fractionation method
A method is repeated processes of crystallization/recrystallization, for a supplementary refining.But it is a nonsense in your question: salt or pure salt are both sodium chloride, supposed to be pure.
No, crude oil is not a pure compound. It is a complex mixture of hydrocarbons and other organic compounds, including sulfur, nitrogen, and oxygen. The composition of crude oil varies depending on its source.
Various methods could be used to separate such a mixture. However, one suitable method which is widely used for separating gas mixtures is fractional condensation. This method relies on differences in boiling points to separate the components.
Cryogenic distillation of air is a method to obtain pure noble gases.