Evaporation crystallization of sodium sulfate – how long can 316L be used?
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Sodium sulfate is evaporated and crystallized; the concentration of sodium sulfate is 20%, chloride ions are at 60 ppm, the pH is 7, and the evaporation temperature is 90°C. How long can 316L be used?
It’s hard to say how long. But there must be preservatives. Recommendation: Apply a PTFE coating to the parts in contact with the material. Spraying of PTFE ETFE can be carried out based on material, temperature, and pH. Excellent corrosion resistance.
A graphite heat exchanger can be used as the heater.
We all use 316L; duplex stainless steel is also an option
Chloride ions at 60 PPM at 90°C – according to the tables, this is the limit value; it won’t last long
It is related to the residual stress resulting from equipment heat treatment, turbulence oscillations, and Cl- concentration. This device poses usage risks and has inherent safety issues.
317 will work; if the temperature might be even higher, then 318 will suffice!
At this concentration and temperature, it might be possible to conduct a test first; I believe it won’t take much time :)
316 won’t work, and 2205 is also a problem.