Fluid catalytic cracking (FCC) units are a central part of modern oil refineries. What does "fluid" refer to?
Correct answer: B. The solid catalyst behaves like a fluid when aerated with vapor
- A. The feedstock is a liquid
- B. The solid catalyst behaves like a fluid when aerated with vapor
- C. The product is a liquid fuel
- D. The process uses a liquid catalyst
Explanation
In an FCC unit, the very fine, solid catalyst particles are suspended in the hot, up-flowing hydrocarbon vapor. This suspension makes the solid-gas mixture behave like a boiling liquid (a fluidized bed), which allows for excellent mixing and heat transfer.
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Industrial chemistry applies chemical reactions and material properties to the manufacture of adhesives, dyes and polymers. Coverage includes addition and condensation polymerisation, thermoplastics and thermosetting polymers, the structural basis of colour in dyes, and how adhesive composition enables bonding between surfaces.
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