Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about ________________ mm Hg absolute?
Correct answer: B. 30 to 80
- A. 1 to 5
- B. 30 to 80
- C. 250 to 350
- D. 450 to 500
Explanation
Vacuum distillation commonly operates at roughly 30 to 80 mm Hg absolute, reducing boiling temperatures and preventing excessive thermal cracking of heavy oil fractions. The other ranges are either too low or too high for the usual column pressure.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Chemical Process Principles
2,710 free Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Chemical Process Principles questions
Petroleum liquid fuels having flash point greater than 66°C is considered as safe during storage and handling. Which of the following has flash point > 66°C ?
Hydrogen percentage (by weight) in crude petroleum may be about __________________?
Flash point of an oil is determined by the _____________________?
With increase in the molecular weight of aromatic present in kerosene, its smoking tendency ?
Which of the following factors does not govern the mechanism of petroleum formation from organic sources ?
Maximum viscosity of tar/PCM/fuel oil for easy and efficient atomisation in conventional burner is _______________ centistokes (or 100 Redwood I seconds) ?