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Thank you for your help. I didn't realize the density measurement could be made without removing a sample from the evaporator but it makes sense since the pressure of the system has no effect on it's mass. I agree with your comment of simple and robust. Those features are very important.

How can the concentration of NaOH, in water solution, be measured while the solution is in a vacuum evaporator? The goal is to take the concentration to say 28% to cause the precipitation of a crystalline material. My list of potentials include pH, Conductivity, Density and Viscosity. I...

How can the concentration of NaOH, in water solution, be measured while the solution is in a vacuum evaporator? The goal is to take the concentration to say 28% to cause the precipitation of a crystalline material. My list of potentials include pH, Conductivity, Density and Viscosity. I...

Matt, Thanks for the information. I will get a copy of Coulson and Richardson's book on order tomorrow. I had initially thought a continuous concentrator would be too complex, but now I look forward to learning more of the details. I appreciate your patience with me on this request. Lew

mbt22, Thank you for the safety reminder. I have been involved in water purification systems for 35 years now and outside of electrical issues, the main issue of concern has been wet feet. I was unaware of OSHA's program. I will certainly study that and keep safety at the front of the...

Thanks MJCronin for your reply. I apologize for the question, but I can assure you it is not a homework problem and I have not been assigned the project by anyone. I only have myself to blame. There is an inorganic dissolved in the solution, but it is not germane to the problem. I am aware...

I am investigating a process that includes concentrating 5,000 gallons of a 25% NaOH, 75% water mixture to 40% NaOH, 60% water mixture. I will have 24 hours to process a batch. It will have to be done with no operator in attendance. The system will be monitored as needed remotely...