缩聚法生产PET聚酯

从饮料瓶到纺织纤维

Petrochemical & Refining Global Industrial Scale $55 billion

概述

Polyethylene terephthalate (PET) is produced by polycondensation of ethylene glycol with terephthalic acid (PTA). PET is the world's most recycled plastic, used for beverage bottles, food packaging, and polyester textile fibers. The two-stage process involves esterification followed by melt polycondensation under vacuum. Global PET production exceeds 90 million tons annually, with approximately 70% used for fibers and 30% for packaging.

化学工艺

Purified terephthalic acid (PTA) is esterified with ethylene glycol (EG) at 240-260 degrees C to form bis(2-hydroxyethyl) terephthalate (BHET). The BHET undergoes melt polycondensation at 270-290 degrees C under high vacuum (<1 mbar) using antimony trioxide catalyst, removing ethylene glycol to build molecular weight. Solid-state polymerization (SSP) further increases IV for bottle-grade resin.

nHOOC-C₆H₄-COOH + nHOCH₂CH₂OH →[Sb₂O₃, 280 degrees C, vacuum] −(OC-C₆H₄-CO-OCH₂CH₂O)ₙ− + (2n-1)H₂O

原材料

  • Purified terephthalic acid (PTA, C₈H₆O₄) — Oxidation of p-xylene (Diacid monomer)
  • Ethylene glycol (C₂H₆O₂) — Hydration of ethylene oxide (Diol monomer)
  • Antimony trioxide (Sb₂O₃) — Mining and smelting (Polycondensation catalyst)

最终产品

  • PET resin (chips/pellets) — Bottles, packaging, polyester fibers (IV 0.60-0.84 dL/g depending on grade)
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Environmental Impact

PET is the most recycled plastic with established mechanical and chemical recycling infrastructure. However, production from fossil feedstocks contributes to CO₂ emissions. Antimony catalyst traces in PET have raised health concerns. Microfiber shedding from polyester textiles is a growing environmental issue.

安全注意事项

最新创新

Bio-based PET using plant-derived ethylene glycol and furandicarboxylic acid (PEF) as a drop-in replacement is in commercial development.
Enzymatic depolymerization by PETase enzymes enables closed-loop chemical recycling under mild conditions.

生产规模

90000000

吨/年

$55 billion

市场价值

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Frequently Asked Questions

What industry uses 缩聚法生产PET聚酯?
缩聚法生产PET聚酯 is used in the petrochemical & refining sector at global industrial scale scale.
What process is involved in 缩聚法生产PET聚酯?
Purified terephthalic acid (PTA) is esterified with ethylene glycol (EG) at 240-260 degrees C to form bis(2-hydroxyethyl) terephthalate (BHET). The BHET undergoes melt polycondensation at 270-290 degrees C under high vacuum (<1 mbar) using antimony trioxide catalyst, removing ethylene glycol to buil
What is the economic significance of 缩聚法生产PET聚酯?
缩聚法生产PET聚酯 has a market value of $55 billion and annual production of 90,000,000 tons.
What is the environmental impact of 缩聚法生产PET聚酯?
PET is the most recycled plastic with established mechanical and chemical recycling infrastructure. However, production from fossil feedstocks contributes to CO₂ emissions. Antimony catalyst traces in PET have raised health concerns. Microfiber shedding from polyester textiles is a growing environme
What raw materials are used in 缩聚法生产PET聚酯?
The main raw materials include: Purified terephthalic acid (PTA, C₈H₆O₄), Ethylene glycol (C₂H₆O₂), Antimony trioxide (Sb₂O₃).