Trade name：Purified
terephthalic acid（PTA）
Product property and usage
Being
widely used in chemical fibers, light industry, electronics, construction
and all aspects of the civil economy,
PTA is one of the important bulk organic raw materials. At the same time, the application of PTA is
concentrated, more than 90% of PTA in the world is used in the production of
polyethylene terephthalate (PET). It takes 0.85-0.86 ton PTA to produce 1 ton
PET and 0.33-0.34 ton of MEG (ethylene glycol). Polyesters include fiber chips,
polyester fibers, bottles slices and film sections. In the domestic market, 75%
of PTA is used to produce polyester fibers and 20% is used to produce bottle
grade polyester, which is mainly used in the packaging of various beverages, especially
carbonated beverages; 5% for membrane grade polyester, mainly applied to
packaging materials, film and tape.
Quality index
|
Item
|
Top grades
|
First grade
|
|
Appearance
|
White powder
|
White powder
|
|
Acid value /（mgKOH/g）
|
675±2
|
675±2
|
|
P-Carboxybenzaldehyde/（mg/Kg）
|
≤25
|
≤25
|
|
p-methylbenzaldehyde /（mg/Kg）
|
≤150
|
≤180
|
|
Ignition residue/（mg/Kg）
|
≤6
|
≤10
|
|
Total heavy metal （Mo, Cr, Ni, Co, mn, Fe ）/（mg/Kg）
|
≤3
|
≤5
|
|
Fe/（mg/Kg）
|
≤1
|
≤2
|
|
moisture，W/%
|
≤0.2
|
≤0.2
|
|
DMF tinct（5g/100ml）/Hazen unit
（Platinum cobalt color
number ）
|
≤10
|
≤10
|
|
b*value
|
≤1.4
|
≤1.5
|
|
Particle size distribution
|
More than 250μm，W/%
|
7.9
|
7.9
|
|
More than 45μm，W/%
|
10.2
|
10.2
|
|
average grain diameter/μm（sieve method）
|
128
|
128
|