Polyester:
Polyester means many organic salts. Polyester is man made,
synthetic polymer, polyester filament or staple fibre. Polyester fibre are
chemically composed of at least 85% by wt. of an ester of a substituted
aromatic carboxylic acid, including but not restituted terephthalate units and
para substituted hydroxybenzoate units.
Polyethyne terephthalate, the repeating unit of then polyester
with a degree of polymerization of 115-140 units.
Manufacturing process:
1.
Continuous
process of PET:
Raw mlts:
The main raw mtls requird for the manufacture of
polyester fibre are P-xylene, ethylene glycol and methanol.
1. Terephthalic acid or D.M.T:
a. Terephthalic acid is
made by oxidizing P-xylene with air and nitric acid.
b. Terephthalene acid is
esterified with methyl alchole to from Dimethyle terephthalate(DMT)
2. 2. Ethylene
glycol:
Ethylene glycol is made by catalytic oxidation
of ethylene.
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