GATE CH · 2026 · CH
Question 48: Mass Transfer
Give it a try, then reveal the answer to check your work.
Question 48
CHMCQ2 marksNeeds review
A gas stream with 2.01 mol % ammonia is to be scrubbed in a counter-current isothermal packed bed absorber using pure water to reduce its concentration to 0.01 mol %. Assume that dilute conditions apply, operating line is linear and the mass transfer coefficients are constant throughout the column. The liquid and the gas flows inside the absorber (in kmol m
h
) are 1000 and 200, respectively. The equilibrium relationship is
, where,
is the mole-fraction of ammonia in the gas phase and
is that in the liquid. Under these conditions, the height of overall gas transfer unit (
) is 0.8 m and the number of overall transfer units (
) is given by the following integral.
The integration is performed between the two ends of the column, and
is the equilibrium mole fraction in the gas phase, corresponding to the composition of the liquid at corresponding location. Which one of the following is the minimum length of the packing (in m) necessary to achieve the desired scrubbing?Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerEXPLORE & PRACTISE
Paper and topic context
See where this question comes from and choose what to practise next.
2026CH
GATE CH 2026 · Paper 1
Chemical Engineering · Original paper archive
- Section
- Chemical Engineering
- Question type
- Multiple choice (MCQ)
- Marks
- 2 marks
Practise related topics
Explore more previous year questions using this question’s imported topic tags.
chemical engineering
GATE CH previous year questions
process engineering
GATE CH previous year questions
chemical processes
GATE CH previous year questions
mass transfer
GATE CH previous year questions
mass transfer coefficients
GATE CH previous year questions
Comments
Ask a question, share your approach, or help someone understand.
Log in to view the discussion
You’re not logged in. Log in or create an account to see discussions and add comments.