Isopropanol, also known as 2-propanol or isopropanol, is a colorless, transparent, and volatile flammable liquid with a special odor similar to the mixture of ethanol and acetone. It is a widely used organic solvent and chemical raw material in the chemical industry, and is miscible with most organic solvents such as water, ethanol, ether, chloroform, etc. It plays an important role in various fields such as industry, medicine, and daily chemical products.
1、 Basic physical and chemical properties
Isopropanol belongs to the class of aliphatic alcohol compounds, which contain hydroxyl groups (- OH) in their molecular structure. It is chemically active and exhibits typical reaction characteristics of alcohols. Its nuclear and psychological properties are as follows:
1. Physical properties: It is a liquid at room temperature and pressure, with a boiling point of 82.4 ℃, a melting point of -89.5 ℃, a density of 0.786 g/cm ³ (20 ℃), a flash point of 12 ℃ (closed cup), strong volatility, and is prone to producing flammable vapors. Vapors can form explosive mixtures with air, with an explosion limit of 2.0% -12.7% (volume fraction)
2. Chemical properties: Can react with metallic sodium to produce sodium isopropanol and hydrogen gas; Dehydration reaction can occur, generating propylene under the catalysis of concentrated sulfuric acid; Can undergo esterification reaction with carboxylic acids to generate corresponding ester compounds; Simultaneously possessing a certain degree of reducibility, it can be oxidized to acetone, and further oxidation can generate acetic acid.
Compared with other alcohols, isopropanol has better solubility, moderate volatility, and lower toxicity than methanol. Therefore, it can replace methanol and ethanol as solvents in many scenarios, balancing safety and practicality.
2、 Main purpose
The application of isopropanol covers multiple fields such as industry, medicine, daily chemical, electronics, and food. With its excellent solubility and chemical properties, it has become an indispensable basic chemical product. The specific uses are as follows:
1. Solvent field: As an excellent organic solvent, it is widely used as a diluent and solvent for coatings, paints, inks, adhesives, etc. It can effectively dissolve organic compounds such as resins, oils, dyes, etc., and improve the leveling and stability of products; Simultaneously used as a cleaning agent in the printing industry, it can quickly remove ink residue from printing equipment without damaging equipment components.
2. Pharmaceutical field: It can be used as a pharmaceutical intermediate for the synthesis of pharmaceutical raw materials such as isopropylamine and isopropanol. It is also a commonly used medical disinfectant. Isopropanol with a concentration of 70% -75% has good bactericidal effect and can be used for skin disinfection and medical device disinfection (non-invasive). Its bactericidal principle is to denature and coagulate bacterial proteins to achieve the purpose of sterilization, and its irritability is lower than ethanol.
3. In the field of electronics: used for cleaning electronic components and semiconductor wafers, it can quickly remove oil stains, dust, and residual impurities on the surface of components, and has strong volatility. After cleaning, there is no residue and it will not affect the performance of electronic components. It is an important cleaning solvent in the electronic manufacturing industry.
4. Daily chemical field: used in the production of cosmetics, skin care products and detergents. As a solvent or humectant, it can help dissolve the effective ingredients in the formula, and has a certain moisturizing effect. It is often used in toners, lotion, hair dyes and other products; In addition, it can also be used to dilute perfume and adjust the concentration and volatilization speed of perfume.
5. Chemical synthesis: As an important chemical intermediate, it is used to produce chemical products such as acetone, isopropyl ether, and isopropyl ester. It is also a raw material for synthesizing polymer materials such as polyether polyols and polyurethane, and is widely used in industries such as plastics, rubber, and fibers.
6. Other fields: used in food processing as a food additive (solvent), which can be used to extract ingredients such as spices and pigments from food; Simultaneously used as an additive for automotive antifreeze and brake oil, it can lower the freezing point and improve fluidity; In addition, it can also be used as a fuel additive to improve the combustion performance of fuel.
3、 Safety and usage precautions
Isopropanol is flammable, volatile, and toxic. Inhaling high concentrations of vapor can cause central nervous system symptoms such as dizziness, headache, nausea, and vomiting. Long term skin contact may lead to dryness and cracking. The following precautions should be taken when using and storing:
1. When operating, it is necessary to wear protective masks, gloves, and goggles to avoid direct skin contact and inhalation of vapors. The operating environment should be well ventilated, away from sources of fire and heat, and smoking is strictly prohibited.
2. Store in a cool, dry, and ventilated warehouse, away from fire and heat sources, with a temperature controlled below 30 ℃, avoiding mixing with oxidants, acids, alkalis, and other substances to prevent chemical reactions.
3. Waste disposal must comply with environmental standards and cannot be dumped at will. It should be entrusted to professional institutions for harmless treatment or recycled through distillation to reduce environmental pollution.