Diphenylamine, with the CAS number 122 - 39 - 4, is an organic compound. Its molecular formula is C₁₂H₁₁N, and the molecular weight is approximately 169.22 g/mol. It appears as a colorless to pale - yellow crystal or powder. Diphenylamine is slightly soluble in water but highly soluble in organic solvents such as ethanol, ether, and benzene. It has a melting point of around 52 - 54 °C and a boiling point of about 302 °C. The density of diphenylamine is about 1.16 g/cm³ at 25 °C.
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1. **In the rubber industry**: Diphenylamine is used as an antioxidant. It can prevent the rubber from aging and degradation caused by oxygen, ozone, and heat. This helps to extend the service life of rubber products such as tires, rubber hoses, and conveyor belts.
2. **In the chemical analysis field**: It is used as an indicator in some redox titrations. For example, in the determination of nitrate ions, diphenylamine can react with certain oxidation - reduction substances, and the color change can be used to indicate the end - point of the titration.
3. **In the dye industry**: Diphenylamine can be used as an intermediate in the synthesis of some dyes. It participates in the chemical reactions to form the basic structure of dyes, giving the dyes specific colors and properties.
4. **In the explosive industry**: It is used as a stabilizer for nitrocellulose - based explosives. It can slow down the decomposition rate of nitrocellulose, improving the safety and stability of explosives during storage and use.
1. **Rubber industry**: When using diphenylamine as an antioxidant in rubber, it should be added during the rubber mixing process. The recommended dosage is usually 0.5 - 3 parts per hundred parts of rubber (phr). First, pre - disperse diphenylamine in a small amount of rubber or other additives to ensure uniform dispersion in the rubber compound.
2. **Chemical analysis**: As an indicator in redox titrations, a small amount of diphenylamine solution (usually prepared in sulfuric acid medium) is added to the sample solution before the titration. During the titration process, observe the color change of the solution closely to determine the end - point.
3. **Dye industry**: In dye synthesis, diphenylamine is used according to the specific reaction conditions and stoichiometry of the synthesis process. It usually needs to react with other chemical reagents under certain temperature, pressure, and catalyst conditions.
4. **Explosive industry**: When used as a stabilizer in explosives, diphenylamine is added during the manufacturing process of nitrocellulose - based explosives. The dosage is carefully calculated based on the type and quantity of explosives to ensure the best stabilizing effect.
1. **Case 1: Rubber tire production**
A large - scale tire manufacturing company was facing the problem of rapid tire aging and cracking. After adding diphenylamine as an antioxidant to their rubber formula at a dosage of 1.5 phr, the service life of the tires was significantly extended. The tires showed better resistance to ozone and heat aging, reducing the number of premature tire failures. This not only saved costs for the company but also improved the reputation of their products in the market.
2. **Case 2: Chemical analysis in a laboratory**
In a chemical analysis laboratory, when determining the nitrate content in a water sample, diphenylamine was used as an indicator in the redox titration. The color change of diphenylamine clearly indicated the end - point of the titration, allowing for accurate determination of the nitrate concentration. This method was more sensitive and reliable compared to other traditional methods.
3. **Case 3: Dye synthesis in a chemical plant**
A chemical plant was synthesizing a new type of blue dye. By using diphenylamine as an intermediate, they were able to obtain a dye with bright color and good light - fastness. The diphenylamine participated in the key chemical reactions, forming the unique molecular structure of the dye. The new dye was well - received in the textile industry.
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