Purified Terephthalic Acid (PTA)

Purified terephthalic acid (PTA) is primarily used in polyester production with polyester fibre consuming a large proportion of global output. However, polyethylene terephthalate (PET) resin production for packaging and film applications is growing very rapidly due to its success in penetrating the soft drinks and water bottles market.

A smaller proportion of PTA is utilised in the production of polyester film which had, until recently, been the material of choice for the audio recording industry. The remaining PTA is used in making cyclohexanedimethanol, terephthaloyl chloride, copolyester-ether elastomers, plasticisers and liquid crystal polymers.

Worldwide around 65% of PTA goes into polyester fibre, 27% to PET bottle resin and the remaining eight% to film and other plastic end uses. However, the breakdown for the US market shows the growing dominance of PET resin where solid state resins account for 50%; polyester fibres, 43%; polyester film, 3%; and other, 4%.

PTA dust can be explosive, and it reacts strongly with oxidants. The substance can irritate the eyes and skin.

Technical Specifications of the Purified Terephthalic Acid (PTA)

Production Process

Mitsui-Amoco Process: The raw material, para-xylene,is oxidized by air in a liquid phase and through steps of hydrogenation-purification.

Properties

White powder-like crystal, sublimation at about 300,soluble in alkali solution, slightly soluble in hot ethylalcohol, tiny solubility in water, not soluble in ethyl ether, glacial acetic acid, and chloroform. The product has the features of high purity, even particle-size distribution, good sizing ability, low content of 4-carboxybenzaldehyde(4-CBA).

Major Applications

Used as the feedstock to produce polyester by direct esterification continuous condensation and then to produce polyester products. It also can be used to produce plasticizer, polyester lacquer etc.

Storage

Separately stored in dry, ventilated warehouse equipped with fire-fighting facilities according to different grades and lot no.

Transportation

Products in bags are transported by truck, train or vessel covered with waterproof tarpaulins. Handle with care.

Safety Precautions

1. Keep away from fire and heat sources for storage and transportation, since the product is inflammable, and its dust is explosive.

2. Can not be transported or stored together with chemicals like oils,acids and alkali etc.

3. Proper measures should be taken to avoid damages to goods and personnel during loading and unloading.

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