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  • Paradichlorobenzene is a chlorinated aromatic hydrocarbon compound used as a fumigant insecticide and repellant.
  • There are three forms of dichlorobenzene, differing in the position of the two chlorine atoms on the benzene ring.
  • Paradichlorobenzene is a colorless to white solid crystal with a strong pungent  odor.
  • Is also known as 1,4-Dichlorobenzene, paradichlorobenzol, p-DCB and PDB.


  • 1,4-dichlorobenzene is produced by chlorination of benzene in the presence of a catalyst.
    1,2-dichlorobenzene is obtained simultaneously. Crystallization combined with distillation is
    used to obtain the isomers separation.
  • The formation of paradichlorobenzene is accompanied by the formation of various by-products such as ortho-dichlorobenzene, meta-dichlorobenzene, morehighly chlorinated benzenes, and often some degredation products.


  • Paradichlorobenzene is primarily used in mothballs and similar products to protect clothing from moths.
  • Paradichlorobenzene is also used in deodorant blocks for rest room toilets and trash containers.
  • It has been used as an insecticide for the control of termites and other organisms in soil and as a fungicide agent for the control of plant diseases.
  • 1,4-dichlorobenzene is used in mainly 3 applications:
    50% is used as raw material in synthesis of pesticides, resins, and dyestuffs
    22% as toilet blocks deodorant
    28% as moth repellent

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