1,2,4-Trichlorobenzene, with the CAS number 120 - 82 - 1, is a high - quality chemical compound. It is a colorless to light yellow liquid with a characteristic odor. The molecular formula of 1,2,4 - Trichlorobenzene is C₆H₃Cl₃, and its molecular weight is approximately 181.44 g/mol. The density of this compound is around 1.454 g/mL at 25 °C, and it has a melting point of 17 - 18 °C and a boiling point of about 213 - 214 °C. It is insoluble in water but soluble in many organic solvents such as ethanol, ether, and benzene.
1. **In the Chemical Industry**: It serves as an important intermediate in the synthesis of various chemicals. For example, it can be used in the production of pesticides, where it participates in chemical reactions to form active ingredients that are effective against pests. It also finds application in the manufacturing of dyes, helping to create specific colors and improve the color - fastness of the final dye products.
2. **As a Solvent**: Due to its solubility properties, 1,2,4 - Trichlorobenzene can be used as a solvent in some industrial processes. It can dissolve certain polymers and resins, facilitating the processing and formulation of products such as adhesives and coatings.
3. **In Analytical Chemistry**: It can be used as a reference standard in gas chromatography and other analytical techniques to identify and quantify related compounds.
1. **Handling Precautions**: When handling 1,2,4 - Trichlorobenzene, it is necessary to wear appropriate personal protective equipment, including gloves, goggles, and a lab coat. Work in a well - ventilated area or under a fume hood to avoid inhalation of vapors.
2. **Storage**: Store the product in a cool, dry, and well - ventilated place. Keep it away from sources of ignition and incompatible substances. It should be stored in tightly sealed containers to prevent leakage.
3. **Dilution and Reaction**: If dilution is required, use appropriate solvents. When using it in chemical reactions, follow the reaction conditions carefully, including temperature, pressure, and reaction time.
1. **Pesticide Production Case**: A chemical company was developing a new type of pesticide. They used 1,2,4 - Trichlorobenzene as a key intermediate. In the synthesis process, they first mixed 1,2,4 - Trichlorobenzene with a specific amine compound in a reaction vessel under controlled temperature (around 100 °C) and pressure conditions. After a series of catalytic reactions, they obtained an active ingredient for the pesticide. The resulting pesticide was tested in the field and showed excellent pest - control effects, with a significantly higher effectiveness compared to some traditional pesticides.
2. **Dye Manufacturing Case**: A dye manufacturer used 1,2,4 - Trichlorobenzene as a solvent in the formulation of a new blue dye. They dissolved a certain dye precursor in 1,2,4 - Trichlorobenzene and then added other additives. The resulting dye had better solubility in the printing paste, which improved the printing quality on fabrics. The color fastness of the dyed fabrics was also enhanced, reducing the color fading during washing and sunlight exposure.
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