PTA

Description: White needle crystal or powder

Uses     : As a reagent for alkali in wool , additive to poultry feeds.

Chemical and physical properties
Combustibility:    Flammable
Toxicity     :     Low toxicity
Density     :     1.510 g/cm3
Sublimation  :    402 ℃ ( Under natural pressure)
Melting point:   425 ℃ (in a gland )
Solubility   : dissolving in hot grain alcohol , not dissolving in water, aether , glacial acetic acid and chloroform.

PTA Specification:

Package and storage
Storage      :  Keep container closed when not in use, Store in a cool, dry,well-ventilated area away from strong oxidizing substances.
Package      :   Pocket by measured or pocket in tank car

Preparation
High temp. oxidation:   While acetic acid as solvent, Co,Mn, Br admixture as catalyzer p-xylene will oxidate into crude terephthalic acid . Under certain temperature and pressure. Then CTA  dissolve into water under high temperature and pressure. And passa Pd/C catalyzer settled vessel which is a reactor where the oxidation production will be hydrogenated in order to removeimpurity(4-CBA).Afterward.the hydrogenation production will become the final production(PTA) after crystallizing filtrating P-Tol acid and drying.    

Health related information
Ingestion   :   May cause irritation fo the digestive tract
Inhalation  :   Causes respiratory tract irritation
Skin           :   Causes slight skin irritation
Eyes         :   Causes eye irritation

Test Item	Specification
PTA Content%	99%
Metal(Fe,Mo,Cr,Ti,Mn,Ni,Co)ppm≤	≤4ppm
Moisture %≤	≤0.5%
Fe ppm≤	2ppm
DMF Chroma.5%Liquor	10
4-CBA ppm≤	≤25ppm
Acid Num(mg KOH/g)	675±2