Recycled acidic water evaporation / condensation

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Discussion Overview

The discussion revolves around the recycling of contaminated water from a powdercoating process, specifically focusing on the feasibility of evaporating the water and condensing it to achieve purity. Participants explore the implications of acid and other chemicals potentially being carried over during this process.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires whether evaporating contaminated water and condensing it would yield pure water or if contaminants would carry over.
  • Another participant suggests that the inquiry resembles designing a fractional distillation apparatus and questions the parameters affecting its performance.
  • A participant expresses the intention to evaporate the water without separating components, hoping that acids would remain behind during condensation.
  • It is noted that acid vapors are likely to condense along with water vapor, contradicting the initial hope for purity.
  • One participant questions whether acid vapors condense at a significantly different temperature than water, suggesting the possibility of using cooling coils for separation.
  • Another participant raises the idea of neutralizing the acid before evaporation, but acknowledges uncertainty regarding the specific acid and neutralizing agent.
  • Concerns are expressed about the difficulty of determining the best approach without knowing the specific acid or base involved in the neutralization process.
  • A participant admits to feeling uncertain about the chemistry involved and indicates a need for further research.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the effectiveness of the proposed methods for achieving purity in the recycled water. Multiple competing views regarding the behavior of acid vapors and the potential for neutralization remain unresolved.

Contextual Notes

Limitations include the lack of specific information about the type of acid present, the concentrations involved, and the parameters necessary for effective separation or neutralization.

neil63
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I would like to recycle a source of used water at work. The water is contaminated with an acid solution and other chemicals used in a powdercoating process. My question is -- if I were to evaporate the water and then turn it back to condensate, would the water be pure? or would the acid and other chemicals be carried over?
thanks in anticipation of a learned response.
 
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neil63 said:
I would like to recycle a source of used water at work. The water is contaminated with an acid solution and other chemicals used in a powdercoating process. My question is -- if I were to evaporate the water and then turn it back to condensate, would the water be pure? or would the acid and other chemicals be carried over?
thanks in anticipation of a learned response.
"Pure?" Sounds as though you want to design a "fractional distillation apparatus" but aren't certain what parameters determine the performance of said apparatus;
https://en.wikipedia.org/wiki/Fractional_distillation
.
 
Hi thanks for the reply. I'm not trying to separate the component parts, I am hoping merely to evaporate the "dirty" water and then condense it in the hope that any acid would be left behind. My plan involves pumping the liquid up to a thin tank mounted in the roof space where the temperature is 100' C with the aid of a small vacuum pump drop the pressure and then condense the resulting steam ready for re-use . ?
 
This is very process specific, but in general, yes, the acid vapors will condense too.
 
thanks Russ not the answer I was hoping for but much appreciated non the less
 
Just a thought seeing as bystander mentioned it. Would the acid vapors condense at a substantially different temperature to the water? or would it be easier to neutralize the acid first by dosing?
 
neil63 said:
Just a thought seeing as bystander mentioned it. Would the acid vapors condense at a substantially different temperature to the water?
They could, yes, but typically you only have ambient temperatures available unless you intend to put a cooling coil (or several) in the duct.
...or would it be easier to neutralize the acid first by dosing?
Not sure what that means -- weak on the chemistry...
 
neil63 said:
would it be easier to neutralize the acid first by dosing?
Without knowing the specific acid, or base selected to neutralize it, or concentrations, it's really difficult to say. You may be "protecting" a proprietary process, or you may be groping about in the dark.
 
Groping is probably nearest the mark, thanks again, think I will do some more research and I'll be back ... cheers
 

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