Brain oil (naphtha) is one of the petroleum products, also known as chemical light oil and crude gasoline. It is a light oil used for chemical raw materials produced by processing crude oil or other raw materials, and is mainly used as chemical raw materials. There are various distillation ranges for different purposes. China stipulates that the distillation range is about 220°C for the initial boiling point. When used as a cracking raw material for the production of ethylene, the 70°C~145°C fraction is called light naphtha; when the purpose is to produce aromatic hydrocarbons or high-octane gasoline, the 70°C~180°C fraction is used to weigh the naphtha; When used as a solvent, it is called solvent naphtha; the aromatic solvent from coal tar is also called naphtha or solvent naphtha.