What Is Dichlorobenzene?
Dichlorobenzene is a chemical compound derived from benzene, in which two hydrogen atoms are replaced with chlorine atoms. There are three isomers of dichlorobenzene, namely ortho-dichlorobenzene (o-dichlorobenzene), meta-dichlorobenzene (m-dichlorobenzene), and para-dichlorobenzene (p-dichlorobenzene), differing in the positions of the chlorine atoms on the benzene ring. The production of dichlorobenzene typically involves the chlorination of benzene using an iron catalyst, yielding a mixture of the o- and p-isomers.
Uses of Dichlorobenzene
1. O-Dichlorobenzene
O-dichlorobenzene is used in the production of intermediates for resins, dyes, pigments, pharmaceuticals, and agricultural chemicals. It also serves as a quarantine insecticide, disinfectant, heat-transfer medium, and solvent.
2. M-Dichlorobenzene
M-dichlorobenzene is utilized as an intermediate in the synthesis of agrochemicals, dyes, pigments, and pharmaceuticals.
3. P-Dichlorobenzene
P-dichlorobenzene is commonly used as a deodorant, insecticide for clothing, disinfectant, heat transfer medium, raw material for organic synthesis (such as PPS resin), and solvent.
Properties of Dichlorobenzene
Dichlorobenzene has the molecular formula C6H4Cl2 and a molecular weight of 147.004. It is almost insoluble in water but soluble in ethanol, ether, and acetone.
1. O-Dichlorobenzene
O-dichlorobenzene, with CAS number 95-50-1, is a colorless to yellow liquid with a distinctive aroma. It is non-flammable but can form explosive mixtures with air near its flash point. It has a melting point of -17°C and a boiling point of 180-183°C.
2. M-Dichlorobenzene
M-dichlorobenzene, CAS number 541-73-1, is a clear, colorless liquid and is non-flammable. It has a melting point of -24.8°C and a boiling point of 173°C.
3. P-Dichlorobenzene
P-dichlorobenzene, CAS number 106-46-7, is colorless with a camphor-like odor. It has a melting point of 53°C and a boiling point of 174°C. It is hazardous when heated and can produce toxic hydrogen chloride fumes.
Other Information on Dichlorobenzene
Handling and Storage
Dichlorobenzene should be handled with appropriate protective gear, including respiratory protection, gloves, and eyewear. Work areas should be well-ventilated. Store it in a cool, ventilated area, away from flames and oxidizing agents.
First Aid Measures
In case of inhalation, seek medical attention if symptoms occur. For skin contact, wash with water and seek medical advice if necessary. In case of eye contact, rinse with water for several minutes. If swallowed, do not induce vomiting; seek immediate medical attention.