Multicomponent Distillation Design - Full Short Cut Method

🚀 Looking to design a multicomponent distillation column by hand or without software? This is why you need the Short Cut Method! 💯
⚙️ In this full design tutorial we will discuss the various equations required, before tackling a full column design. The key parameters we will determine are...
- Minimum Number of Stages
- Actual Number of Stages
- Minimum Reflux Ratio
- Actual Reflux Ratio
- Feed Entry Point
🎉 We will also do some preliminary analysis to show the relationship between the reflux ratio and the number of trays.
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[@alexdenny7339]

Never fails to deliver, can we get sharing this mans videos, more people need to see them!!

[@TheChemEngStudent]

Thank you for your kind words!

[@derekneil9870]

This has been super useful for me! Thank you Callum 👏

[@TheChemEngStudent]

Thank you for your kind words, glad you found it useful!

[@MikeyBro5728]

Thanks, its really hard to find comprehensive breakdowns like this for ChemE, and I greatly appreciate it, it is much need in our community.

[@TheChemEngStudent]

Thank you for your kind words, much apprecaited! I am glad you found it useful.

[@user-tv4ck3qj6e]

Really good explanation sir

[@TheChemEngStudent]

Thank you for your kind words!

[@HolyCairney]

Your something else Callum

[@TheChemEngStudent]

Thank you for your kind words!

[@jordinwelsh7018]

Everyone who comments are legends!

[@Alear_0]

Your video was really good, but I have a question. Sorry if it sounds stupid, but can this method be used for a packed bed Distillation Column?

[@TheChemEngStudent]

Thank you for your kind words, in the case of a packed bed Distillation Column the best design method would be Equilibrium-Stage modelling, or Mass Transfer Rate-Based modelling as in the Short Cut method is based on the number of trays, whereas packed beds don't use trays. I hope this helps, thanks for watching!

[@nephalamakulisani4858]

Well explained, very useful. Thank you very much Sir. But I really thought Colburn method will also be covered in this video, I am struggling to understand it. Thank you

[@TheChemEngStudent]

Thank you for your kind words! We can certainly look at making a video specifically on the Colburn method! Thank you for your suggestion!

[@jamesdavid9390]

this is a realy really good explaination. I do hove also a few questions, about the method, can I put them here ?

[@TheChemEngStudent]

Thank you for your kind words, sure please feel free either to comment your questions or you can get in toiuch directly via email.

[@jamesdavid9390]

@TheChemEngStudent I have a question. I need to design a distillation column as small as possible. I do not need very Hight purity of the distilate. What parameter would have the biggest impact on the size of the column (height reduction if possible)

[@TheChemEngStudent]

@@jamesdavid9390 The key parameters that determine the overall "size" of the column is really the final product purity, and the feed composition. Since the more pure the product the higher/more number of stages you will require. It is also worth considering the types of plates as their efficiency will play a part in the amount you will need. Aditionally, the thermodynamics of the system is also key as you can manipulate the temeprature and pressure to facilitate a quicker separation. Those are the ones I would focus on first and optimise from there. I hope this helps!

[@jamesdavid9390]

@TheChemEngStudent A thousand thanks for your answer. This explains a lot. Also I am quite well verse with excel, if there are part of the spreadsheet you would like me to help with in order to make it easy for you please do not hesitate. I would be more than happy to help

[@haz195]

hi, great video. just wondering, you said the feed is saturated vapour so wouldn't q = 0? meaning the underwood equation = 1?

[@TheChemEngStudent]

Thank you for your kind words. Yes you are correct, I miss-spoke during this tutorial and made a slight error in the wording of the question. Thank you for highlighting this and for watching, much appreciated!

[@andrewsenzo6677]

Hi, i really wish you have outlined how the top and bottom temperatures where obtained and actually shown by example how the relative volatilities where obtained from the depreister charts . most examples do not really explain these points.

[@TheChemEngStudent]

Thank you for your suggestion, we will look at creating a depreister chart specific video. We do have a relative volatility tutorial from an equation and modelling perspective. Thanks again for watching!

[@sophiefidell9124]

Hi, this video has been really helpful, but how do I get my relative volatilities when my system doesn't involve hydrocarbons as I am trying to design a distillation column to separate CO2 from hydrogen/syngas?

[@TheChemEngStudent]

The process for obtaining the relative volatilities is generally the same, with the exception of a few. In the case of CO2 separation from syngas, the key thing to make sure is that there is no reaction taking place as this process won't work, similarly if there is a large deviation from non-ideal systems. The easiest method of determining relative volatilities is through the Hengstebeack's method and using the De Priester chart for equilibrium constants. I hope this helps, thank you for watching!

[@bongandimande490]

yes please can we have a downloadable spreadsheet

[@TheChemEngStudent]

Certainly, I will let you know once its available. Thank you for watching!

[@jamesdavid9390]

thanks so so much. @@TheChemEngStudent

[@samathikorala4841]

How do we do this calculation on an Excel sheet? Can you please provide a template

[@TheChemEngStudent]

The Excel template is now available to download in the description. Thank you for watching!

[@gonhog4445]

I may be wrong, but it looks like you linked the wrong spreadsheet! The one you linked is for a binary separation. @@TheChemEngStudent

[@TheChemEngStudent]

@@gonhog4445 My apologies, we don't currently have an Excel Template for Multi-Component Systems. We will look into creating one.