Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are ?
Correct answer: C. 9
- A. 4
- B. 8
- C. 9
- D. 10
Explanation
For 98% recovery, the outlet acetone fraction is 2% of 0.05, or 0.001. Thus N + 2 = 6 log10(0.05/0.001) ≈ 10.19, giving N ≈ 8.19, so 9 whole trays are required.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Mass Transfer Operations
669 free Mass Transfer Operations 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 Mass Transfer Operations questions
The falling rate period in the drying of a solid is characterised by__________________?
Schmidt number and Lewis number for pure air at atmospheric conditions are respectively__________________?
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the_________________?
Binary distillation involves the mass transfer by ______________________ at the gas-liquid interface?
Which of the following adsorbent is used to decolourise yellow glycerine ?
Surface renewal model of mass transfer was enunciated by___________________?