Cracking Hơi Nước để Sản Xuất Etylen

Nền tảng của ngành công nghiệp hóa dầu

Petrochemical & Refining Global Industrial Scale $180 billion

Tổng quan

Steam cracking is the primary industrial process for producing ethylene, the world's most produced organic chemical. Hydrocarbon feedstocks (ethane, naphtha, or gas oil) are diluted with steam and heated to 750-900 degrees C in tubular furnaces for milliseconds, causing thermal decomposition into smaller olefins. Ethylene is the building block for polyethylene, PVC, ethylene oxide, and dozens of other essential chemicals. Global capacity exceeds 220 million tons per year across approximately 300 crackers worldwide.

Quy trình hóa học

Hydrocarbon feed is mixed with steam and passed through pyrolysis furnace tubes at 750-900 degrees C with residence time of 0.1-0.5 seconds. The cracked gas is rapidly quenched to freeze the product distribution, then separated by compression and cryogenic distillation into ethylene, propylene, butadiene, and other products.

C₂H₆ → C₂H₄ + H₂ (ethane dehydrogenation)
C₈H₁₈ → C₂H₄ + C₃H₆ + C₄H₈ + CH₄ + H₂ (naphtha cracking, multiple products)

Nguyên liệu thô

  • Ethane (C₂H₆) — Natural gas processing (Primary feedstock (US/Middle East))
  • Naphtha (C₅-C₁₂) — Petroleum refining (Primary feedstock (Asia/Europe))
  • Steam (H₂O) — Boiler systems (Diluent to reduce coking)

Sản phẩm cuối

  • Ethylene (C₂H₄) — Polyethylene, ethylene oxide, vinyl chloride (Polymer-grade >99.95%)
  • Propylene (C₃H₆) — Polypropylene, acrylonitrile, propylene oxide (Co-product)
  • 1,3-Butadiene (C₄H₆) — Synthetic rubber (Co-product from naphtha cracking)
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Environmental Impact

Steam cracking is the single largest CO₂-emitting process in the chemical industry, responsible for approximately 300 million tons of CO₂ annually. Furnace combustion and the endothermic reaction require enormous energy input. NOx emissions from high-temperature combustion are significant.

Lưu ý an toàn

Đổi mới gần đây

Electric cracker furnaces powered by renewable energy could reduce CO₂ emissions by 90%.
Oxidative dehydrogenation of ethane and methane-to-olefins via oxidative coupling are being developed as alternative routes.

Quy mô sản xuất

220000000

tấn/năm

$180 billion

giá trị thị trường

Xem thêm Petrochemical & Refining

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Frequently Asked Questions

What industry uses Cracking Hơi Nước để Sản Xuất Etylen?
Cracking Hơi Nước để Sản Xuất Etylen is used in the petrochemical & refining sector at global industrial scale scale.
What process is involved in Cracking Hơi Nước để Sản Xuất Etylen?
Hydrocarbon feed is mixed with steam and passed through pyrolysis furnace tubes at 750-900 degrees C with residence time of 0.1-0.5 seconds. The cracked gas is rapidly quenched to freeze the product distribution, then separated by compression and cryogenic distillation into ethylene, propylene, buta
What is the economic significance of Cracking Hơi Nước để Sản Xuất Etylen?
Cracking Hơi Nước để Sản Xuất Etylen has a market value of $180 billion and annual production of 220,000,000 tons.
What is the environmental impact of Cracking Hơi Nước để Sản Xuất Etylen?
Steam cracking is the single largest CO₂-emitting process in the chemical industry, responsible for approximately 300 million tons of CO₂ annually. Furnace combustion and the endothermic reaction require enormous energy input. NOx emissions from high-temperature combustion are significant.
What raw materials are used in Cracking Hơi Nước để Sản Xuất Etylen?
The main raw materials include: Ethane (C₂H₆), Naphtha (C₅-C₁₂), Steam (H₂O).