Fluid Catalytic Cracking in Petroleum Refining Quiz
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Questions and Answers

What is the principle in the fluid cracking process?

Finely divided powders behave like a fluid when aerated with a gas.

At what gas velocities does the bed of cracking catalyst undergo fluidization?

60–100 cm/s

What is the average size of the cracking catalyst particles?

60–70 average particle size

How is the catalyst circulation rate maintained in the fluid cracking process?

<p>5–8 times greater than the feed rate</p> Signup and view all the answers

What is the typical feedstock to an FCC unit?

<p>A heavy distillate boiling within the range 662–932 °F (350– 500 °C)</p> Signup and view all the answers

What is the function of the gas stream in the fluid cracking process?

<p>It transports the entire catalyst.</p> Signup and view all the answers

How does the catalyst circulation rate compare to the feed rate in the fluid cracking process?

<p>5–8 times greater</p> Signup and view all the answers

What is the typical feedstock temperature range for an FCC unit?

<p>662–932 °F (350– 500 °C)</p> Signup and view all the answers

What positive-pressure differential is required to make the catalyst flow in the desired direction?

<p>0.35 atm</p> Signup and view all the answers

At what gas velocities does the bed of cracking catalyst undergo fluidization in the fluid cracking process?

<p>60–100 cm/s</p> Signup and view all the answers

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