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Introduction
- 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.
Process
- 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.
Uses
-
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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