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Cracking methods, conditions and useful examples for hydrocarbons

Organic chemistry • Carbon compounds as fuels

Key concepts

What you'll likely be quizzed about

  • Cracking breaks long-chain hydrocarbons into shorter chains by cleaving C–C bonds.
  • Its purpose includes producing lighter fuels from heavy fractions and creating alkenes needed for polymers and various chemicals.
  • Heavy fractions lead to low fuel efficiency; cracking increases the availability of petrol and alkenes, enhancing fuel value and industrial utility.

Flashcards

Test your knowledge with interactive flashcards

How does cracking supply raw materials for the polymer industry?

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Cracking produces alkenes like ethene and propene that serve as feedstocks for polymer production.

Key notes

Important points to keep in mind

Catalytic cracking uses a solid acid catalyst (often zeolite) and moderate temperatures (~450 °C).

Steam cracking utilizes very high temperatures (700–1200 °C) with steam to suppress coke and favour alkenes.

Balance cracking equations by conserving carbon and hydrogen atoms on both sides.

Common product pairs include one alkane plus one alkene, or two smaller alkenes, sometimes with H2.

Cracking increases petrol yield and produces alkenes used as chemical feedstocks.

Coke formation deactivates catalysts; steam and catalyst regeneration mitigate its impact.

Short residence time in steam cracking limits secondary reactions and improves alkene yield.

Catalysts alter reaction pathways and lower energy requirements but require periodic regeneration.

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