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Chemical engineering design involves design of plants, processes and
equipment for production of chemicals on a large scale. Design projects
could be for setting up new plants or modification of existing ones.

Engineers perform calculations, analysis and use engineering software
for design activities.

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Let's start with the basics of
designing in chemical
engineering

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Welcome! This company provides chemical engineering design services to chemical manufacturers.
Now you will be working on assignments with their team to understand how designing is done.

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Design requirement

A client of the company is planning to add a new section in their plant for producing 4400 kg/hr of ethyl acetate. Your team has to design the process for production.

(Ethyl acetate is a colourless liquid. It is used as a solvent, in nail
polish removers, in paints and perfumes.)

Steps in designing

Step 1: Process flow

Determining stages in production process, quantity of raw material
and equipment required

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We will now go through designing step by step, first understanding the theory then implementing it on the requirement

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Process flow

Ethyl acetate production process

Feed Stream Preparation

(Ethanol and Acetic Acid)

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Reaction

(Ethanol + Acetic Acid -> Ethyl Acetate + Water )

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Separation

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Ethyl Acetate Storage
and Shipping

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Water Treatment

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Your team has decided that the major stages in ethyl acetate production process will be as above

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Assignment

Now your team has started determining equipment required for the different stages, like which type of reactor will be used in reaction stage.
It is decided that ethyl acetate will be produced in the reactor by following reaction:

CH3CH2OH + CH3COOH -> CH3COOCH2CH3 + H2O

(Ethanol)

(Acetic Acid)

(Ethyl Acetate)

(Water)

You need to find kilograms of ethanol and acetic acid that need to be supplied to the reactor per hour to produce 4400 kilograms of ethyl acetate per hour using the above reaction. Also find kilograms of water that would be produced per hour.

(Assume all the reactants get converted to products. This is a continuous process so kg/hr is used to indicate amount of reactants entering and products leaving the reactor per hour)

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How to find amount of reactants?
view-instruction-icon View Instructions
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Let’s get to work! Instructions above will explain how to solve this assignment. On proceeding you will be taken to your workspace to work on this.

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Start Working

You will now begin working on the calculations for reactants. This assignment should ideally take 10 minutes.

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How to find amount of reactants?

Step 1

Find moles/hr of ethyl acetate corresponding to 4400 kg/hr, using

molar mass

molar mass

Mass of one mole of a substance

 

Step 2

From moles/hr of ethyl acetate find corresponding moles/hr of ethanol and acetic acid required and water produced, using

reaction stoichiometry

reaction stoichiometry

Relationship between quantity of reactants and products given by a balanced chemical reaction

 

Step 3

From moles/hr find kg/hr of ethanol and acetic acid required and water produced, using molar mass

Got it!

Report

Determining the amount of reactants required

CH3CH2OH + CH3COOH -> CH3COOCH2CH3 + H2O

(Ethanol)

(Acetic Acid)

(Ethyl Acetate)

(Water)

Molar masses:

Ethanol = 0.046kg/mole

Acetic Acid = 0.06kg/mole

Ethyl Acetate = 0.088kg/mole

Water = 0.018kg/mole

Condition given:

Amount of ethyl acetate to be produced : 4400 kg/hr

  • step 1
  • step 2
  • step 3

Submitted answer is incorrect.

Try Again View Correct Answer

Incorrect answer. Try again! Use a hint if required.

Your answer is correct. Well done!

Determine moles/hr of ethyl acetate

Amount of ethyl acetate to be produced

=

moles/hr

Enter Value

*Numeric Value Required

Use a hint? Submit right-arrow

Correct Answer

Moles/hr of ethyl acetate to be produced

= (kg/hr of ethyl acetate to be produced)

(molar mass of ethyl acetate in kg/mole)

= 4400

0.088

= 50,000

Proceed right-arrow

Submitted answer is incorrect.

Try Again View Correct Answer

Incorrect answer. Try again! Use a hint if required.

Your answer is correct. Well done!

Amount of ethyl acetate to be produced : 50,000 moles/hr

Determine moles/hr of water, ethanol and acetic acid

Amount of water produced

=

50,000

moles/hr

Enter Value

*Numeric Value Required

Amount of ethanol required

=

50,000

moles/hr

Enter Value

*Numeric Value Required

Amount of acetic acid required

=

50,000

moles/hr

Enter Value

*Numeric Value Required

Use a hint? Submit right-arrow

Correct Answer

As per the reaction, 1 mole of ethanol and 1 mole of acetic acid are required to produce 1 mole of ethyl acetate and 1 mole of water

So, moles/hr of ethanol required

= moles/hr of acetic acid required

= moles/hr of ethyl acetate to be produced

= moles/hr of water to be produced

= 50,000

Proceed right-arrow

Submitted answer is incorrect.

Try Again View Correct Answer

Incorrect answer. Try again! Use a hint if required.

Your answer is correct. Well done!

Amount of water to be produced, and ethanol and acetic acid required : 50,000 moles/hr (each)

Determine kg/hr of water, ethanol and acetic acid

Amount of water to be produced

=

900

kg/hr

Enter Value

*Numeric Value Required

Amount of ethanol required

=

2300

kg/hr

Enter Value

*Numeric Value Required

Amount of acetic acid required

=

3000

kg/hr

Enter Value

*Numeric Value Required

Use a hint? Submit right-arrow

Correct Answer

Kg/hr of water to be produced

= (moles/hr of water to be produced) x (molar mass of water in kg/mole)

= 50,000 x 0.018

= 900

Kg/hr of ethanol required

= (moles/hr of ethanol required) x (molar mass of ethanol in kg/mole)

= 50,000 x 0.046

= 2300

Kg/hr of acetic acid required

= (moles/hr of acetic acid required) x (molar mass of acetic acid in kg/mole)

= 50,000 x 0.06

= 3000

Proceed right-arrow
7 8 9 / C
4 5 6 * π
=
1 2 3 - 0 . + √
( )
How to find amount of reactants?
view-instruction-icon View Instructions

hint-icon Hint

Moles/hr of ethyl acetate to be produced

= (kg/hr of ethyl acetate to be produced) / (molar mass of ethyl acetate in kg/mole)

Got it!

hint-icon Hint

 

As per the reaction, 1 mole of ethanol and 1 mole of acetic acid are required to produce 1 mole of ethyl acetate and 1 mole of water

Got it!

hint-icon Hint

 

Kg/hr of ethanol required

= (moles/hr of ethanol required) x (molar mass of ethanol in kg/mole)

Got it!

Time is up!

This assignment could have been solved in 10 minutes. You can still continue to work on it, though deadlines are important in industry.

Continue Working right-arrow

How to find amount of reactants?

Step 1

Find moles/hr of ethyl acetate corresponding to 4400 kg/hr, using

molar mass

molar mass

Mass of one mole of a substance

Step 2

From moles/hr of ethyl acetate find corresponding moles/hr of ethanol and acetic acid required and water produced, using

reaction stoichiometry

reaction stoichiometry

Relationship between quantity of reactants and products given by a balanced chemical reaction

Step 3

From moles/hr find kg/hr of ethanol and acetic acid required and water produced, using molar mass

Got it!

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