Производство полиэфира PET поликонденсацией

От пластиковых бутылок до текстильных волокон

Petrochemical & Refining Global Industrial Scale $55 billion

Обзор

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.

Химический процесс

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

Сырьё

  • 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)

Конечные продукты

  • 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.

Соображения безопасности

Последние инновации

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.

Масштаб производства

90000000

тонн/год

$55 billion

Рыночная стоимость

Больше в Petrochemical & Refining

Каталитический риформинг для получения высокооктанового бензина

Global Industrial Scale

Паровой крекинг для производства этилена

Global Industrial Scale

Полимеризация полиэтилена

Global Industrial Scale

Производство полипропилена катализом по Циглеру–Натта

Global Industrial Scale

Производство этиленоксида серебряно-каталитическим окислением

Global Industrial Scale

Синтез Фишера–Тропша для синтетических топлив

Commercial Production

Фракционная перегонка нефти

Global Industrial Scale

Frequently Asked Questions

What industry uses Производство полиэфира PET поликонденсацией?
Производство полиэфира PET поликонденсацией is used in the petrochemical & refining sector at global industrial scale scale.
What process is involved in Производство полиэфира PET поликонденсацией?
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 Производство полиэфира PET поликонденсацией?
Производство полиэфира PET поликонденсацией has a market value of $55 billion and annual production of 90,000,000 tons.
What is the environmental impact of Производство полиэфира PET поликонденсацией?
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 Производство полиэфира PET поликонденсацией?
The main raw materials include: Purified terephthalic acid (PTA, C₈H₆O₄), Ethylene glycol (C₂H₆O₂), Antimony trioxide (Sb₂O₃).