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Petroleum is a complex mixture of different boiling point fractions. The crude oil can be divided into several fractions according to the different boiling points of different fractions: gasoline fraction, kerosene fraction, light diesel oil fraction, heavy diesel oil fraction and lubricating oil fraction.

Extraction is a unit operation that is used to separate mixtures. And the separation theory is that the solute has different solubilities in different solvents. In other words, extraction removes the solute from one solvent to another solvent. And extraction is a physical process. Extraction is widely used in chemistry, metallurgy, food and other fields, especially in petroleum refining industry.

Succinonitrile is often used as an organic solvent that is used to extract the aromatic hydrocarbon from the petroleum fraction. Namely, succinonitrile removes aromatic hydrocarbon from the petroleum fraction into itself. And you can get aromatic hydrocarbon from succinonitrile.

Aromatic hydrocarbon has very wide application in many fields of our daily life. Benzene, a type of aromatic hydrocarbon, is important raw material of organic compounds. Benzene is used to make phenol, nitrobenzene, aniline, cyclohexane, styrene and other organic substances. And these organic substances are widely used to manufacture synthetic resins, synthetic fiber, synthetic plastic, dyestuff, medicine, detergent, explosive and so on.

A bottle of colorless transparent solution.
Xylene solution.

The stick figure picture of benzene.
Benzene stick figure.

A heap of white synthetic resin is in a hand and the rest is on the floor.
Aromatic hydrocarbon can be used to make synthetic resin.

 A heap of white synthetic fiber is on the floor.
Aromatic hydrocarbon can be used to manufacture synthetic fiber.

A plastic food container with an orange lid.
Aromatic hydrocarbon can be used to manufacture synthetic plastic, which is widely used in our daily life.

Several heaps of different colors dyestuffs.
Aromatic hydrocarbon can be used to make dyestuffs, which make the world beautiful and colorful.

A heap of various pills and capsules.
Aromatic hydrocarbon can be used to make medicine.

Five bottles of detergent.
Aromatic hydrocarbon can be used to manufacture detergent, which makes clothes clean.

The explosive explodes with flames in the air.
Aromatic hydrocarbon can be used to manufacture explosive, which is used in wars.