Diethylamine, with the CAS number 109 - 89 - 7, is an organic compound with the molecular formula C₄H₁₁N. It is a colorless, volatile liquid with a strong ammonia - like odor. The molar mass of diethylamine is approximately 73.14 g/mol. Its boiling point is around 55 - 57 °C, and the melting point is about - 50 °C. The density of diethylamine is about 0.706 g/mL at 25 °C. It is miscible with water, ethanol, and ether. Diethylamine is a weak base, and its pKa value is approximately 10.98, which indicates its basicity in aqueous solutions.
1. **Chemical Synthesis**: Diethylamine is widely used as a building block in the synthesis of various chemicals. It can be used to prepare pharmaceuticals, such as anti - histamines and local anesthetics. In the production of herbicides and pesticides, diethylamine is an important intermediate. For example, it can react with chloroacetyl chloride to form N, N - diethylchloroacetamide, which is a key intermediate in the synthesis of some widely used herbicides.
2. **Rubber Industry**: It is used as an accelerator in the rubber vulcanization process. By adding diethylamine, the vulcanization rate can be increased, which improves the physical properties of the rubber, such as its strength, elasticity, and heat resistance.
3. **Textile Industry**: Diethylamine can be used in the dyeing and finishing processes of textiles. It can help to improve the solubility and dispersion of dyes, which leads to more uniform dyeing and better color fastness of the textiles.
1. **Handling Precautions**: Diethylamine is a flammable and corrosive substance. When handling it, appropriate personal protective equipment (PPE) should be worn, including safety goggles, gloves, and a lab coat. It should be stored in a cool, well - ventilated area away from open flames and heat sources.
2. **In Chemical Reactions**: In chemical synthesis, diethylamine is usually added slowly to the reaction mixture under stirring. The reaction conditions, such as temperature, pressure, and reaction time, should be carefully controlled according to the specific reaction requirements. For example, in a reaction with an acid chloride, the reaction is usually carried out at low temperatures (around 0 - 5 °C) to avoid side reactions.
3. **Dilution**: If diethylamine needs to be diluted, it should be added to water slowly, not the other way around, to prevent splashing and heat generation.
1. **Pharmaceutical Synthesis**: In the synthesis of a popular anti - histamine drug, diethylamine is used as a key starting material. First, diethylamine reacts with a specific halogenated aromatic compound under basic conditions. The reaction is carried out in an organic solvent at a moderate temperature (around 60 - 70 °C) for several hours. After purification steps such as filtration, extraction, and recrystallization, an intermediate product is obtained. This intermediate is then further reacted with other reagents to form the final anti - histamine drug. The use of high - quality diethylamine in this process ensures high yield and purity of the final product.
2. **Rubber Production**: A rubber manufacturing company uses diethylamine as an accelerator in the production of automobile tires. By adding a proper amount of diethylamine to the rubber compound, the vulcanization time is reduced by about 30%. As a result, the production efficiency is significantly improved. The tires produced with diethylamine as an accelerator have better mechanical properties, such as higher tensile strength and better abrasion resistance, which meet the strict requirements of the automotive industry.
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