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Heat Of Dilution - Resulting Temperature

heat of dilution caustic soda naoh

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#1 A.Kangaris


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Posted 11 April 2017 - 08:15 AM

Hello all,


I need some guidance in finding the resulting temperature for diluting a specific NaOH solution.


I have a stream of 23%w/w of NaOH with a flowrate of 0.042kg/s getting mixed with a stream of 0.445kg/s water, both streams being at 35oC. The resulting diluted solution has a mass fraction of 2%. How can I calculate the resulting temperature of this resulting stream?


I can work it out using a graph that I got from oxychem. However I would like to do it accurately using calcs. Can someone help me out how I can do it?





#2 MrShorty


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Posted 12 April 2017 - 03:11 PM

Post #2 of this thread: https://www.cheresou...erature-change/describes a calculation procedure where the relative enthalpies of NaOH solutions is read off of a graph (from Perry's, I believe). The post mostly describes a relative simple heat/mass balance type calculation. In order to make it "accurate using calcs" one would need an accurate mathematical expression for the relative enthalpy of NaOH solutions as a function of temperature and concentration.


See if that helps get you started.

#3 breizh


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Posted 13 April 2017 - 07:29 AM

hi ,

Go through the document.


#4 A.Kangaris


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Posted 18 April 2017 - 11:04 AM

Thanks a lot Gents!

I managed to work this out!

#5 jadhavsn


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Posted 27 February 2018 - 01:12 PM

I want expression for relative enthalpy of NaOH as function of temperature and concentration.
Or can anyone provide Enthalpy concentration temperature data of NaOH in tabular form ???.
I have chart of enthalpy concentration but using chart is reduces accuracy

Edited by jadhavsn, 27 February 2018 - 01:14 PM.

#6 breizh


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Posted 27 February 2018 - 06:08 PM

Hi ,

Consider these table and Graph.

Good luck,


#7 colby.cleavenger@merrick.c


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Posted 02 June 2020 - 01:25 PM

Hello, I'm trying to do a similar calculation to figure out the final temperature when diluting a batch of water to 7.5% hydrogen peroxide using 25% hydrogen peroxide. Is there a similar document for H2O2 that relates heat of dilution to different concentrations and different temperatures? 

#8 breizh


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Posted 02 June 2020 - 06:47 PM






Consider these resources.

Good luck


Edited by breizh, 03 June 2020 - 07:49 PM.

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