Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of ____________________?
Correct answer: C. Coking
- A. Thermal cracking
- B. Gum formation
- C. Coking
- D. Discoloration
Explanation
Vacuum lowers boiling temperatures so heavy fractions can be distilled without severe thermal damage. At higher temperatures, residue increasingly undergoes carbon-forming reactions that produce coke.
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