6 replies to this topic

[James Clerk Maxwell]

Hello ChemEs,

 

I have a flow with 23 kg/h of ammonia (gas) and 56 kg/h of steam (gas water) all at 1 atm and 90 ºC. Im using a heat exchanger in order to condensate the water, dropping the temperature to 25 ºC.

 

How can i calculate the amount of ammonia dissolved in the liquid water after the condensation?

 

Thanks in advance

[latexman]

Perry's handbook has some water/ammonia equilibrium data that might be useful to you.

[breizh]

Hi,

The easiest way should use a simulator.

Note: @ 90 C 1 ATM water is liquid!

Exothermic reaction.

Solubility of NH3 in water is 32 g/100 ml water @ 25C

https://www.engineer...ter-d_1148.html

 

My experience with Brine is NH3 about 90 g/l in solution and NH4OH aqueous solution @ 12 mole/l.

My 2 cents

Breizh

[shvet1]

I personnaly have such experinece with ammonia dissolution in water.

 

We had to utilize ~100 40L NH3 cylinders. We welded a cylinder-sized pool and filled it with water so a cylinder valve was ~30cm deep. Me personally emptied first ~5 bottles adjusting valve opening by hand and saw as NH3 bubbles are coming out and disappearing being dissolved in water.

Moreover we had a sporadic practice emptying NH3 kettle shell&tube vaporizer by sending to a sparger in an 50m3 open process vessel filled with water and reported no NH3 breackthroughs to atm

 

So my answer is - do not believe them. In yours concentration range NH3 is totally dissolved in water. The proper mixing is the only issue.

Edited by shvet1, 10 September 2024 - 03:38 AM.

[latexman]

How can i calculate the amount of ammonia dissolved in the liquid water after the condensation?

30% ammonium hydroxide is commercially available, so my first guess would be almost all the ammonia is dissolved in the water, it depends on the mixing, however the ammonia will still be quite pungent! Ammonia and water have quite the affinity for each other.

[breizh]

Shvet1,

Have you ever read a MSDS about NH3? 

Your knowledge about the risk associated with NH3 has worried me very much. Be cautious when you reply to post from student. 

Based on 10 years' experience as technical manager in a soda ash plant in Europe. 

Breizh  

 

 

Attached Files

•  Anhydrous_Ammonia_EN_tcm371-282474.pdf   104.76KB   8 downloads

[shvet1]

Have you ever read a MSDS about NH3? 

Your knowledge about the risk associated with NH3 has worried me very much. Be cautious when you reply to post from student. 

 

Yes, I have. And I am able to tell more about NH3 safety than has been written in datasheets and most handbooks.

For example I can tell about the near-miss: NH3 tank sudden rupture that leads to evacuation of middle size town and ban of construction of large single volume NH3 tanks at territory of a continent.

 

Do you consider I should not share a private experience the real facilities are practicing? Are fairy tales of excellent elves riding white horses at green hills of Middle-earth preferred?

Attached Files

•  Jonova 1989.pdf   90.41KB   8 downloads

Edited by shvet1, 16 September 2024 - 07:15 AM.