Release time：2020-07-17 author：Jiangyin CaiYouDao Chemical Co., Ltd clicks：150
One of the five solvents is petroleum. Solvent oil is widely used. The multi choice of dosage * is paint solvent oil (commonly known as paint solvent oil), followed by edible oil, ink, leather, pesticides, pesticides, rubber, cosmetics, spices, medicine, electronic components and other solvent oils.
At present, there are about 400-500 kinds of solvents on the market, of which solvent oils (hydrocarbon solvents, benzene compounds) account for about half. According to the boiling point range, solvent oil can be divided into three categories: low boiling point solvent oil, such as 6 extraction solvent oil, boiling point range is 60-90 C; medium boiling point solvent oil, such as rubber solvent oil, boiling point range is 80-120 C; high boiling point solvent oil, such as paint solvent oil, boiling point range is 140-20. In recent years, ink solvent oil has been widely used, and its drying point can be as high as 300 ℃. According to the chemical structure, solvent oils can be divided into three types: alkanes, cycloalkanes and aromatic hydrocarbons. In fact, solvent oil is a mixture of hydrocarbons of various structures, except for some pure hydrocarbons such as ethane, toluene and xylene. According to the national standard gb1922-88, solvent oils are classified according to 98% distillation temperature or dry point. Commonly used brands are: 70 aromatic flower solvent oil, 90 petroleum ether, 120 rubber solvent oil, 190 detergent oil, 200 paint solvent oil, 260 Special Kerosene solvent. In addition, there are 6 kinds of extraction solvent oil, aviation Detergent Gasoline, 310 kinds of color ink solvent oil. Locust solvent oil. In fact, the market is far more than these, manufacturers can produce various specifications of solvent oil according to the needs of users.
The properties of solvent oils vary according to their use. Solubility, volatility and safety should be considered in the selection of solvent oil. Of course, according to their different uses, other performance can not be ignored, and sometimes even more important. Solvent oil includes two processes: cutting fraction and refining. There are usually three ways to cut the distillate: directly from the atmospheric column; cutting the corresponding light straight fraction into a suitable narrow fraction; and fractionating catalytic reforming raffinate. All kinds of solvent oil fractions generally need to be refined. Improve color and stability, remove corrosive substances and reduce toxicity. The common refining methods are alkali washing, clay refining and hydrofining. Solvent oil is a complex mixture of hydrocarbons, easy to burn and explode. Therefore, from production, storage and transportation to use, we must pay attention to fire prevention. The toxicity of solvent oil can be expressed in three ways: lethal dose (LD): a scale commonly used to express the physiological effects of highly toxic substances on animals. Lethal concentration (LC): a measure of acute poisoning expressed by concentration. *Allowable concentration (MAC): * the allowable concentration is usually expressed as one millionth (ppm or 10-6) of the vapor capacity in the air. This is a rough estimate of solvent toxicity. It varies from person to person, not the large value of *.