GIK Institute of Engineering Sciences & Technology
Hello Haider Ali,
My first question is why are you studying this industrial crystallization process?
If you are studying it for a grade in school. Find out why the overall heat transfer coefficient and viscosity are important to your professor. Then find out this person's recommended way to measure these things. I am not the best one to help you. In academia, your professor is the person to learn from as to what they really want from you.
If you are studying it for a client that seeks better calcium nitrate crystals. Find out what 'better' means to your client (Purer crystals, Lower cost, Faster output)? What instruments do you currently have on their existing crystallizer? Are they seeking to get crystals by evaporation or by cooling a supersaturated solution?
With evaporation, when you add too much heat too fast to drive evaporation the calcium nitrate decomposes.
With supersaturated solutions, you leave most of the product in the crystallizer as a liquid, and may not get all the crystals you seek.
Step 1 for me is to plot the desired parameters (amount of 'better' crystals) against the variables you can easily measure. (time, volume, remaining mass, temperature, rate of temperature change, energy input <amps if electric> <volume of condensate if steam>
This is easily collected data, which you may already have from past production runs or you may have to collect some of it going forward with future production.
If this a future process, you can gather the answers in glass on a small scale and make the decisions you need for scale-up and investment from the glass data.
With a few simple plots, the answers you are seeking should become obvious to you.
With these plots in hand, I doubt you will need to come back to this forum, but if that is not the case, I will gladly help you interpret the data you have and suggest your next step.
TO: Haider Ali
If you are in an academic setting, I suggest you refer to Mullin, J.W. (2001) Crystallization 4th edn. Butterworth-Heinenmann, Oxford.
William B. Woods
Retired Chemical Engineer
Weyers Cave, VA
Sent from Mail for Windows 10