Please explain how to work through this problem in detail. No actual calculations are neccessary. A packed tower is being used to scrub ammonia out of a stream containing only 3% of that gas. The tower contains 1-cm Raschig rings; it is 50 cm in diameter and 4.3 m high. The gas flow of 0.93 kg/sec is at 30 degrees C and is largely air at 100% relative humidity and 1,100 mm Hg; it leaves the tower with only 2.2x10^-6 % NH_3. The liquid flow of 6.7 kg/sec is also at 30 degrees C. The Henry's law constant under these conditions is y_NH3 = 0.85x_NH3. What is the mass transfer coefficient K_G in this tower?

Question
Asked Oct 18, 2019

Please explain how to work through this problem in detail. No actual calculations are neccessary. 

A packed tower is being used to scrub ammonia out of a stream containing only 3% of that gas. The tower contains 1-cm Raschig rings; it is 50 cm in diameter and 4.3 m high. The gas flow of 0.93 kg/sec is at 30 degrees C and is largely air at 100% relative humidity and 1,100 mm Hg; it leaves the tower with only 2.2x10^-6 % NH_3. The liquid flow of 6.7 kg/sec is also at 30 degrees C. The Henry's law constant under these conditions is y_NH3 = 0.85x_NH3. What is the mass transfer coefficient K_G in this tower?

check_circleExpert Solution
Step 1

In the given problem there is a packed tower consist of Raschig rings as packing material which acts as theoretical plate to bring the two different streams (phases) in contact which results into the scrub of NH3 from gas stream to liquid stream under given condition.

Step 2

Design based on individual mass transfer coefficient:

mo
2
Packed
h-h...
dh
' Section
h 0
Differential section of packed column
help_outline

Image Transcriptionclose

mo 2 Packed h-h... dh ' Section h 0 Differential section of packed column

fullscreen
Step 3

Mass balance over the differentia...

(a)(dh)(N)-d(Gy)
=Gdy -ydG
-dG(a)dh)(N
N-k,(yy
when the carrier gas is not soluble
After substitution get the following equation:
-Gdy
dh =
k,yy)ay)
Gdy
К, (у- у)а(1- у)
Gdy
k,(yy)a-y
k, KP
Gdy
KоP. (у - у)а(1—у)
help_outline

Image Transcriptionclose

(a)(dh)(N)-d(Gy) =Gdy -ydG -dG(a)dh)(N N-k,(yy when the carrier gas is not soluble After substitution get the following equation: -Gdy dh = k,yy)ay) Gdy К, (у- у)а(1- у) Gdy k,(yy)a-y k, KP Gdy KоP. (у - у)а(1—у)

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour*

See Solution
*Response times may vary by subject and question
Tagged in

Engineering

Chemical Engineering

Related Chemical Engineering Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: 34.4 gallon of toluene, 85.4 lbm of ethyl acetate, and 3.26 ft cubic of ethanol is poured into a tan...

A: Given information:Volume of Toluene (vt)= 34.4 gallonMass of Ethyl acetate (me) = 85.4 lbmVolume of ...

question_answer

Q: This problem is (8.18) from a book  "Thermodynamics and Statistical Mechanics An Integrated Approach...

A: Compressibility (β) of a substance is the fractional differential change in its volume with respect ...

question_answer

Q: 2. Sugar cane can be assumed to consist of 15% sugars, 15% fiber (Solids) and 70% water (all based i...

A: Let the basis of the calculation be 1 kg of the sugarcane fed to produce non-crystallized sugar.Suga...

question_answer

Q: A process is carried out in which a mixture containing 25.0 wt% methanol, 42.5% ethanol, and the bal...

A: Part (a)The flowchart for the given process is drawn below.Let ‘M’ represent methanol, ‘E’ represent...

question_answer

Q: This problem is (6.21) from a book  "Thermodynamics and Statistical Mechanics An Integrated Approach...

A: Efficiency of refrigerator is measured by coefficient of performanceCOP  of a refrigerator is writte...

question_answer

Q: with degree of freedom analysis

A: Given information in the problem:Feed mass flow rate = 300 kg/hr

question_answer

Q: This problem is (7.13) from a book  "Thermodynamics and Statistical Mechanics An Integrated Approach...

A: Note that the given expression for the intensive Gibbs energy in a binary mixture of A and B is corr...

question_answer

Q: PLEASE ANSWER (D) ONLY.

A: Since questions have too many parts, we are only answering first three parts.Part (a)For tank A,Mass...

question_answer

Q: In 2018, US gold production was 210 metric ton. One morning last week, the price of gold on the N.Y....

A: The mass (m) of the gold produced in US, in year 2018, is 210 metric ton.The density of gold (ρ) is ...