إنتاج البولي إستر PET عبر التكثيف البوليمري
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://chemfyi.com/iframe/entity//" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>
Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://chemfyi.com/entity//
Add a dynamic SVG badge to your README or docs.
[](https://chemfyi.com/entity//)
Use the native HTML custom element.
من زجاجات المشروبات إلى ألياف النسيج
نظرة عامة
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.
العملية الكيميائية
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.
المواد الخام
-
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)
المنتجات النهائية
-
PET resin (chips/pellets) — Bottles, packaging, polyester fibers (IV 0.60-0.84 dL/g depending on grade)
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.
اعتبارات السلامة
- ⚠ High-temperature melt processing (270-290 degrees C)
- ⚠ Ethylene glycol is toxic if ingested
- ⚠ Vacuum systems require rigorous maintenance
- ⚠ Antimony trioxide is a suspected carcinogen
الابتكارات الحديثة
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.
حجم الإنتاج
90000000
طن/سنة
$55 billion
القيمة السوقية
المزيد في %(name)s Petrochemical & Refining
إنتاج أكسيد الإيثيلين عبر الأكسدة بالفضة كمحفز
Global Industrial Scale
إنتاج البولي بروبيلين عبر تحفيز زيغلر-ناتا
Global Industrial Scale
الإصلاح الحفزي للبنزين عالي الأوكتان
Global Industrial Scale
التقطير التجزيئي للنفط الخام
Global Industrial Scale
التكسير الحراري بالبخار لإنتاج الإيثيلين
Global Industrial Scale
بلمرة البولي إيثيلين
Global Industrial Scale
تخليق فيشر-تروبش للوقود الاصطناعي
Commercial Production