Naphtha has different distillation ranges for different purposes.
1, the distillation range is from the initial distillation point to about 220℃, and it is used as reforming and chemical raw materials.
2. Light naphtha uses 70- 145℃ fraction as reforming feedstock for aromatic hydrocarbon production.
3. Heavy naphtha, using 70- 180℃ fraction to produce high octane gasoline.
4. When used as a solvent, it is called solvent oil, and the aromatic solvent in coal tar is also called naphtha or solvent oil. Also known as crude gasoline, it generally contains 55.4% alkanes, 30.3% monocyclic alkanes, 2.4% bicyclic alkanes, alkylbenzene1.7%, benzene 0. 1%, indane and naphthalene 0. 1%. Average molecular weight 1 14, density 0.76g/cm3, limit 1.2%-6.0%.
5. Because the market price of naphtha is much lower than that of unleaded gasoline for vehicles, the price difference per ton is 600- 1200 yuan. Private petrochemical enterprises generally use naphtha and petrochemical additives to blend unleaded gasoline for vehicles, thus increasing the profit of refined oil.
The harm of naphtha.
Naphtha is flammable and irritating, and its vapor can form an explosive mixture with air, which will cause combustion and explosion when exposed to open fire and high heat energy. Can react strongly with oxidant. Its steam can also irritate eyes and upper respiratory tract. Too high concentration can cause anoxic symptoms such as dyspnea and cyanosis in a few minutes, which is also harmful to the environment and pollutes water, soil and atmosphere. ?