ポリエチレン重合
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世界で最も生産されるプラスチック
概要
Polyethylene (PE) is the most produced plastic globally, manufactured through the catalytic polymerization of ethylene. Three major grades are produced: HDPE (Ziegler-Natta or chromium catalysts), LDPE (free-radical high-pressure process), and LLDPE (gas-phase or solution process with metallocene catalysts). Applications range from packaging films and bottles to pipes and automotive parts. The development of PE catalysts by Ziegler and Natta, who won the 1963 Nobel Prize, transformed materials science.
化学プロセス
For HDPE: ethylene is polymerized at 80-150 degrees C and 10-80 bar using Ziegler-Natta (TiCl₄/MgCl₂ + AlEt₃) or Phillips (CrO₃/SiO₂) catalysts in gas-phase fluidized bed or slurry reactors. For LDPE: ethylene is polymerized at 150-300 degrees C and 1000-3000 bar using peroxide initiators.
原材料
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Ethylene (C₂H₄) — Steam cracking (Monomer)
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1-Hexene or 1-butene — Oligomerization of ethylene (Comonomer (for LLDPE))
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Ziegler-Natta catalyst (TiCl₄/MgCl₂) — Chemical synthesis (Polymerization catalyst)
最終製品
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Polyethylene resin (pellets) — Films, bottles, pipes, containers (HDPE, LDPE, LLDPE grades)
Environmental Impact
Polyethylene production consumes significant energy and fossil feedstocks. PE waste is a major contributor to plastic pollution in oceans and landfills. Only about 30% of PE is recycled globally. Microplastic formation from PE degradation is an emerging environmental concern.
安全性の考慮事項
- ⚠ Ethylene is extremely flammable and explosive
- ⚠ High-pressure LDPE reactors operate at 1000-3000 bar — catastrophic failure risk
- ⚠ Organoaluminum co-catalysts are pyrophoric
- ⚠ Fine polymer dust is an explosion hazard
最新のイノベーション
Chemical recycling via pyrolysis converts PE waste back to monomers.
Bio-based polyethylene from sugarcane ethanol (Braskem I'm green PE) provides a renewable alternative.
Single-site metallocene catalysts enable precise control of molecular architecture.
生産規模
110000000
トン/年
$140 billion
市場価値