## Solution Library

# Determination of Minimum Gas Flow Rate

**Question**

A packed tower is to be designed to remove ammonia from an aqueous liquid stream by stripping with air. The entering liquid has an NH_{3} mole fraction of 0.0425 and a flow rate of 0.4 kmol/min; the gas is pure air, 80% of the ammonia is to be removed from the liquid. The figure below shows the equilibrium concentrations at 40^{0} C, 1.0 atm.

** **

- Plot a point on the diagram corresponding to the stream entering and leaving the bottom of the column.
- What is the minimum gas flow rate for this situation?
- If the gas leaving has a mole fraction of 0.048 moles NH
_{3}/mol , what is the gas flow rate ? - Using the log-mean concentration difference method, estimate the number of overall, gas phase transfer units required to produce the gas with a mole fraction of 0.048. discuss whether you think the actual number needed would be higher or lower than this value. Based on your observations of the given diagram.
- Determine the height and diameter needed for the column to operate at 80% of the flooding velocity, using values of: H
_{y}= 1.3 meters, H_{x}= 0.9 meters, flooding velocity is 2.5 m/s.

**Summary: **This question belongs to heat transfer and discusses about a packed tower which is designed to remove ammonia from an aqueous liquid. Determines minimum gas flow rate for this situation and height and diameter needed for the column to operate at given percentage of the flooding velocity.

**Answer is in image format**

Download Full Solution

## Comments

Rashathis is a very good website

maaniI have 50 questions for the same test your page is showing only 28

joeannehi can you please help or guide me to answer my assignments. thanks

joeannehi can anyone help or guide me to my assignments. thanks

MonikCristinaThis solution is perfect ...thanks

JaneteHello Allison,I love the 2nd image that you did! I also, had never heard of SumoPaint, is something that I will have to exolpre a bit! I understand completely the 52 (or so) youtube videos that you probably watched. Sometimes they have what you want, sometimes they don't! However, it is always satisfying when you are able to produce something that you have taught yourself. Great job!Debra 0 likes

SandeepPerfect bank of solution.

Oxanagreat !

Paul Brandon-Fritziusthanks for the quick response. the solution looks good. :)

tina Johnsonthnx for the answer. it was perfect. just the way i wanted it.

Giuseppeworks fine.