What is Purified Terephthalic Acid (PTA)?

PTA is high-purity terephthalic acid, also called 1,4-benzenedicarboxylic acid, with CAS 100-21-0 and molecular formula C₈H₆O₄. It is the primary aromatic diacid feedstock for polyester production.

What is PTA mainly used for?

It is used mainly to produce polyethylene terephthalate resin for bottles, fibers and films. It also serves as a monomer in polyester polyols, coatings and specialty polymer synthesis.

What specifications should be confirmed before ordering?

Confirm purity, 4-carboxybenzaldehyde content, p-toluic acid, moisture, color, ash and particle size. The batch analysis should state the actual polyester-grade limits and test methods.

How should PTA be stored and handled?

Store in tightly closed containers or silos in a cool, dry area away from ignition sources and strong oxidizers. Use dust controls and PPE, and follow the safety information for spill, disposal and first-aid procedures.

Why is 4-carboxybenzaldehyde an important PTA specification?

4-Carboxybenzaldehyde, also called 4-CBA, is a key oxidation byproduct that can terminate or color PET polymerization if present above low ppm limits. Polymer-grade PTA therefore specifies a low maximum 4-CBA content to protect melt quality, brightness and molecular weight control.

Purified Terephthalic Acid CAS 100-21-0

Purified Terephthalic Acid (PTA), CAS 100-21-0, is a high-purity aromatic dicarboxylic acid used mainly to produce PET resin for bottles, fibers and films. Confirm the required purity, 4-carboxybenzaldehyde and p-toluic acid for the intended polymerization.

CAS: 100-21-0
Synonyms: 1,4-Benzenedicarboxylic acid, p-Phthalic acid, Benzene-1,4-dicarboxylic acid, TPA
Einecs: 202-830-0
Molecular Formula: C₈H₆O₄
Grade: Industrial grade 99%
Package: 25kg/bag

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Product Description

Purified Terephthalic Acid, CAS 100-21-0, is high-purity 1,4-benzenedicarboxylic acid (p-phthalic acid, TPA); the EC/EINECS number is 202-830-0.

Synonyms: 1,4-Benzenedicarboxylic acid; p-Phthalic acid; Benzene-1,4-dicarboxylic acid; TPA.

CAS: 100-21-0.

Molecular formula: C₈H₆O₄.

Molecular weight: 166.13.

EC number: 202-830-0.

It is a white crystalline powder of low toxicity; the dust is combustible, with a heat of combustion of about 3225.9 kJ/mol.

It is produced by liquid-phase oxidation of p-xylene to crude terephthalic acid, followed by purification.

It is used mainly to produce polyethylene terephthalate resin for bottles, fibers and films by esterification with ethylene glycol.

It also serves as a monomer in polyester polyols, coatings and specialty polymer synthesis.

Confirm purity, 4-carboxybenzaldehyde content, p-toluic acid, moisture, color, ash and particle size.

Store in tightly closed containers or silos in a cool, dry area away from ignition sources and strong oxidizers, and use dust controls with PPE.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA, or other product-specific files.

Regulated-use suitability must be confirmed separately with current product-specific documentation.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Purified Terephthalic Acid (PTA)?

A: PTA is high-purity terephthalic acid, also called 1,4-benzenedicarboxylic acid, with CAS 100-21-0 and molecular formula C₈H₆O₄. It is the primary aromatic diacid feedstock for polyester production.
Q:
What is PTA mainly used for?

A: It is used mainly to produce polyethylene terephthalate resin for bottles, fibers and films. It also serves as a monomer in polyester polyols, coatings and specialty polymer synthesis.
Q:
What specifications should be confirmed before ordering?

A: Confirm purity, 4-carboxybenzaldehyde content, p-toluic acid, moisture, color, ash and particle size. The batch analysis should state the actual polyester-grade limits and test methods.
Q:
How should PTA be stored and handled?

A: Store in tightly closed containers or silos in a cool, dry area away from ignition sources and strong oxidizers. Use dust controls and PPE, and follow the safety information for spill, disposal and first-aid procedures.
Q:
Why is 4-carboxybenzaldehyde an important PTA specification?

A: 4-Carboxybenzaldehyde, also called 4-CBA, is a key oxidation byproduct that can terminate or color PET polymerization if present above low ppm limits. Polymer-grade PTA therefore specifies a low maximum 4-CBA content to protect melt quality, brightness and molecular weight control.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

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COA, TDS, SDS/MSDS and packing details are available on request.

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