Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

Mass Balance Problem


This topic has been archived. This means that you cannot reply to this topic.
1 reply to this topic
Share this topic:
| More

#1 Charles Peterson

Charles Peterson

    Brand New Member

  • Validating
  • Pip
  • 1 posts

Posted 22 April 2014 - 02:57 AM

Hi there,

I have been struggling with a problem which I have found while studying mass balances.

I feel like some guidence with this problem will help better my understanding of the subject.

I am first year chemical engineering so I do not have much knowledge as of yet.

The question is as follows:

 

Na2CO3 is reacted with Ca(OH)2 in the calciner via the reaction:

Na2CO3 + Ca(OH)2 -> 2NaOH + CaCO3

The CaCO3 washed in a thickener and converted to CaO in a kiln via the reaction:

CaCO3 -> CaO + CO2

The resulting lime (CaO) is hydrated in the slaker to again obtain Ca(OH)2:

CaO + H2O -> Ca(OH)2

 

The compositions are as shown on the flowsheet (which is attached)

In addition, m5 = 4 x m3, and m10 = amount of water in stream 1 (m meaning mass flow rate)

Assume all reactions have 100% conversion. Compositions are in wt%.

 

Using a1000 kg/hr basis, determine the number of kilograms of CaCO3 required per kilograms of Na2CO3 processed.

 

I do not even know where to start.

Any help would be greatly appreciated

 

Attached Files

  • Attached File  a.jpg   31.77KB   3 downloads


#2 Art Montemayor

Art Montemayor

    Gold Member

  • Admin
  • 5,780 posts

Posted 22 April 2014 - 07:29 AM

Charlie:

 

I’ll help you by walking you through this simple, stoichiometric problem.  However, I’ll do it only under the following agreed-upon stipulations:

  1. This problem, as you state, is something that you are working on for practice.  It is not an assignment and will not be handed in for credit.
  2. You will read and follow the organization and step-wise solution (and recommendations) cited on the attached Excel workbook that is the engineering tool to be used in resolving this type of problem and calculation.  Note that this first version is Rev 0; all subsequent revisions will be numbered sequentially as I upload them.  If you have any remarks, corrections, revisions to the workbook, by all means do them – but update the Rev number in the title.
  3. Tell us what Chemical Engineering text book you are using and what university you are attending.
  4. Tell us if you have taken 2 years of chemistry in high school before entering university.  Also tell us what Chemical Engineering courses you have taken and are currently enrolled in.

I await your agreement to the above and I will respond with my Rev1 of the workbook where you will find the method used to arrive at the answer(s).

Attached File  Calcium Carbonate Production Rev0.xlsx   67.02KB   37 downloads






Similar Topics