I have a quiz on Material and Energy Balances (Chemical Engineering)

11/8/2017 Quiz: HW6.P1.C - Canvas - CSU

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HW6.P1.C

Started: Nov 8 at 7:27pm

Quiz Instruc ons

A gas stream contains 40 mol% isopropanol in air and flows at 240 mol/min, 70 C, and 1 atm. You are to use a condenser operating at a lower temperature to liquefy and recover isopropanol for reuse in the process.

The condenser uses a chilled water coil to cool the gas stream to 25 C and produces a liquid condensate stream that is in equilibrium with the exiting gas stream.

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2 ptsQuestion 1

Sketch a process flow sheet for this condenser, assuming air has negligible solubility in the liquid output stream.

Select from the following list the mass balances for both isopropanol (IPA) and air.

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Mohamed Almeraikhi

11/8/2017 Quiz: HW6.P1.C - Canvas - CSU

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2 ptsQuestion 2

Solve for the mole fraction of IPA in the exiting gas stream.

Hint: The two mass balances above aren't enough to solve for this mole fraction. There is another equation you can use

to directly solve!

Keep four decimal places in your answer (e.g.: X.XXXX)

2 ptsQuestion 3

Solve for the total flow rate of exiting gas stream in mol/min.

Round to the nearest tenth and do not include units

2 ptsQuestion 4

Calculate the mole percent recovery of isopropanol in the condensate stream.

11/8/2017 Quiz: HW6.P1.C - Canvas - CSU

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Round to the nearest hundredth and do not include the % symbol

2 ptsQuestion 5

Now you wish to change the condenser operating temperature in order to recover 98% of the isopropanol.

Work backward to find the new mole percent air in the exiting gas stream.

Keep three decimal places in your answer and do not include units.

4 ptsQuestion 6

Download the provided MATLAB template (HW6_1_template.m (https://colostate.instructure.com/files/7153600/download? verifier=0eDB6ZPdOLGFKW9NYahivu0PuYHMgf9JDmMzmCkz&wrap=1) (https://colostate.instructure.com/files/7153600/download? verifier=0eDB6ZPdOLGFKW9NYahivu0PuYHMgf9JDmMzmCkz&wrap=1) (https://colostate.instructure.com/files/7153600/download?

11/8/2017 Quiz: HW6.P1.C - Canvas - CSU

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verifier=0eDB6ZPdOLGFKW9NYahivu0PuYHMgf9JDmMzmCkz&wrap=1) ) and fill in the script to re-solve for the percent recovery of isopropanol while allowing O and N in the air to dissolve into the isopropanol liquid stream.

Assume the 25 C Henry's Law constants of 43,800 atm for O and 86,400 atm for N .

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1 ptsQuestion 7

True

False

Accounting for solubility of air significantly changes the percent recovery of isopropanol.

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