Asked Oct 8, 2019

 gas stream contains 15.0 mole% hexane and the remainder nitrogen. The stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied. The hexane mole percent in the gas stream leaving the condenser is 6.00. Liquid hexane condensate is recovered at a rate of 1.00 L/min. You may take the specific gravity of liquid hexane to be 0.6548.

What is the flow rate of the gas stream leaving the condenser in mol/min?  mol/min

What percentage of hexane entering the condenser is removed as a liquid? %

Gas Out
Liquid Condensate
CgH14 (liq)

Image Transcriptionclose

Gas Out Feed CONDENSER N2 CeH14 N2 CeH14 Liquid Condensate CgH14 (liq)


Expert Answer

Step 1

Condenser is a device which is used to condense the vapors  into liquid state by reducing the temperature  (transferring heat).

Let molar flow rate of stream 1( feed stream ) = 100mol/min

Mole percent  of hexane = 15 %

Therefore , mole percent of nitrogen becomes = 85 %



Image Transcriptionclose

stream (2) stream (1): 100 mol/min F P CONDENSER N2 N2 C&H14 C H14 stream (3) C&H14 (liq) W

Step 2

Mole percent of hexane in stream (2) = 6%

Therefore, mole percent of nitrogen in stream (2) = 94%

In stream (3) only hexane is present and volumetric flow rate of hexane is given 1 liter/min

Specific gravity of hexane is given 0.6548

Specific gravity = density of substance /density of water

Density of water = 1000 kg/m3

1 m3 = 1000 liter

Therefore, density of hexane is calculated as:


Image Transcriptionclose

Phexane 0.6548= (kg 1000 m Phexane 1000 Kgx0.6548 m kg =654.8 m (m) kg 654.8 1000(liter) m2 0.6548 kg liter

Step 3

Flow rate of gas stream leaving the condenser is calculated as follows:

Applying component balance on nitrogen

Let  F denotes feed stream (stream 1) , P denotes  flow rate of str...


Image Transcriptionclose

FXXNPXXN 100 molx0.85=Px0.94 min P=90.425 mol min


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


Chemical Engineering

Process Calculations

Related Chemical Engineering Q&A

Find answers to questions asked by student like you
Show more Q&A

Q: This problem is (5.9) from a book  "Thermodynamics and Statistical Mechanics An Integrated Approach ...

A: Internal energy: internal energy is the energy which is stored within the system. It is  the sum of ...


Q: 2. The absorption tower is often used for absorbing gases. The gas is introduced at the bottom of th...

A: Part (a)Let,The mass of inlet gas be m1 kg.The mass of outlet gas be m2 kg.The mass of inlet water(a...


Q: Determine the specific potential energy change that water undergoes when a mass of water is raised 4...

A: Specific potential energy is the potential energy of 1 unit mass of the object. Change in specific p...


Q: Problem 4 You have developed a genetically engineered strain of a methanotroph bacteria (a bacteria ...

A: Let n1 to n5 represent the molar flowrate of components in outlet stream.The reactions taking place ...


Q: Please answer parts (d), (e), and (f).

A: Part (d)For the input, U(s) = 4/s, the output Y(s) is written as shown below.


Q: What are some enviromental, social, and economic risks of polystyrene watse.  How can recycling help...

A: Polystyrene is formed by polymerization process of monomer styrene. It is an aromatic hydrocarbon.Re...


Q: All details in question, please show all steps

A: Part (a)Michaelis-Menten equation to be used is written as equation (1).The reciprocal equation of (...


Q: 4.8 A surge tank in Fig. E4.8 is designed with a slotted weir so that the outflow rate, w, is propor...

A: Apply material balance on the given system as:


Q: A stream of high pressure saturated liquid water at 100 bar flowing through an insulated 2-inch pipe...

A: Saturated liquid means liquid which can be vaporize if heat is supplied further. For water 1000 c is...