Craqueamento a Vapor para Produção de Etileno

A espinha dorsal da indústria petroquímica

Petrochemical & Refining Global Industrial Scale $180 billion

Visão geral

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.

Processo químico

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)

Matérias-primas

  • 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)

Produtos finais

  • 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.

Considerações de segurança

Inovações recentes

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.

Escala de produção

220000000

toneladas/ano

$180 billion

valor de mercado

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Frequently Asked Questions

What industry uses Craqueamento a Vapor para Produção de Etileno?
Craqueamento a Vapor para Produção de Etileno is used in the petrochemical & refining sector at global industrial scale scale.
What process is involved in Craqueamento a Vapor para Produção de Etileno?
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 Craqueamento a Vapor para Produção de Etileno?
Craqueamento a Vapor para Produção de Etileno has a market value of $180 billion and annual production of 220,000,000 tons.
What is the environmental impact of Craqueamento a Vapor para Produção de Etileno?
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 Craqueamento a Vapor para Produção de Etileno?
The main raw materials include: Ethane (C₂H₆), Naphtha (C₅-C₁₂), Steam (H₂O).