Purified Terephthalic acid

Purified Terephthalic acid (PTA) is one of the important bulk organic raw materials, widely used in chemical fiber, light industry, electronics, construction and other aspects of the national economy.

Applications of Purified Terephthalic Acid

PTA’s rigid para-substituted benzene ring imparts exceptional mechanical properties and recyclability, making it indispensable in high-volume industries:

• PET Resin Production: Primary monomer for bottle-grade PET, used in carbonated drinks, water packaging, and food containers, offering lightweight strength and 100% recyclability.
• Textile Fibers: Polymerized into polyester fibers for apparel, upholstery, and tire cords, providing wrinkle resistance and durability in clothing and automotive textiles.
• Films and Sheets: Enables clear, heat-resistant polyester films for packaging, electronics, and solar backsheets, enhancing barrier properties against moisture and UV.
• Engineering Plastics: Incorporated into high-performance copolyesters for automotive parts, electrical insulators, and medical devices due to its chemical resistance.
• Sustainable Innovations: Supports bio-based PET variants and rPET blends, reducing virgin plastic use and aligning with circular economy targets in global supply chains.

Annual global PTA consumption tops 80 million tons, fueled by rising demand for recycled content in consumer goods.

Why Choose Aozun Chem’s Purified Terephthalic Acid?

• Ultra-High Purity: Certified to ASTM and ISO 9001 standards, with <10 ppm ash content for crystal-clear PET extrusions.
• Economical Scale: Competitive bulk pricing with assured supply stability for long-term contracts.
• Efficient Global Logistics: Swift delivery across Asia, Europe, and North America, with MOQs as low as 1 MT.
• Innovation Support: Comprehensive technical services, including polymerization trials and impurity analysis.
• Sustainability Leadership: Low-emission production and compatibility with recycled feedstocks, compliant with REACH and GRS certifications.

Harness Aozun Chem’s PTA to streamline your polyester operations and embrace greener manufacturing.

Frequently Asked Questions (FAQs)

What is purified terephthalic acid (PTA), and why is purification critical?

Purified terephthalic acid (C₆H₄(COOH)₂) is a refined form of terephthalic acid used as a co-monomer with ethylene glycol to produce PET. Purification via crystallization removes impurities like color bodies and aldehydes, ensuring high intrinsic viscosity (IV >0.65 dL/g) and preventing haze or brittleness in final products.

How is purified terephthalic acid manufactured?

It is produced through the Amoco process: catalytic oxidation of p-xylene with air at high temperature and pressure, followed by multi-stage purification to achieve >99.99% purity. This method yields over 95% efficiency and supports large-scale operations exceeding 1 million tons per facility.

What safety considerations apply to handling PTA?

PTA is a mild irritant to skin, eyes, and respiratory systems but non-toxic orally (LD50 >5,000 mg/kg in rats). Use PPE, avoid dust inhalation, and store in dry, ventilated areas away from strong oxidizers. It poses low fire risk (flash point >200°C) but can form combustible dust clouds.

Is purified terephthalic acid suitable for food-contact applications?

Yes, when meeting FDA 21 CFR 177.1315 and EU 10/2011 standards, PTA-derived PET is approved for direct food contact, including acidic beverages, due to its inertness and migration limits below 10 ppb.

What is the shelf life and optimal storage for PTA?

PTA remains stable for 2-5 years under cool (<40°C), dry conditions in sealed packaging to prevent moisture absorption and caking. Use anti-caking agents for humid climates and maintain FIFO stock rotation.

Can PTA be integrated into bio-based or recycled polyester systems?

Absolutely—it’s compatible with bio-ethylene glycol for 100% bio-PET and blends seamlessly with rPET up to 50% content, boosting recyclability and reducing CO₂ emissions by up to 70% compared to virgin PET.

How does PTA compare to isophthalic acid in polyester formulations?

PTA’s symmetric para structure yields semi-crystalline, high-strength PET ideal for bottles and fibers, while isophthalic acid (meta isomer) produces amorphous, flexible copolyesters for films and coatings. PTA dominates 90% of the market for its superior gas barrier properties.

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