Thermal Cracking in Petroleum Refining Quiz
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Questions and Answers

What is the primary objective of visbreaking?

  • To increase the amount of light heating oil required
  • To convert heavy ends to gas and distillates
  • To reduce viscosity of the residue (correct)
  • To produce gasoline with higher octane rating
  • What is the typical conversion percentage of heavy ends to gas, gasoline, and distillates in catalytically cracked products?

  • 5–8%
  • 10–25% (correct)
  • 30–40%
  • 50–60%
  • What is the main cause of high pour point and viscosity for paraffinic base residue?

  • Presence of sulfur compounds
  • Long paraffinic side chains attached to aromatic rings (correct)
  • Excessive heat during refining process
  • High levels of nitrogen content
  • In addition to reducing viscosity, what else can visbreaking be used for?

    <p>Converting fuel oil into lighter distillates</p> Signup and view all the answers

    What does the visbreaking process favor in terms of the paraffinic side chains?

    <p>Breaking of the side chains and subsequent cracking</p> Signup and view all the answers

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