Without much in the way of details, I don't really know whether or not this is safe. I think it needs a thorough hazard analysis with participation by a chemist who understands how much heat is generated, and engineers who know something about the equipment capabilities. You would have to do some temperature rise calculations, and then also worry about the lack of mixing and the potential for local heating to a temperature higher than you would predict from something that was completely mixed. We had a splashing incident when diluting caustic in water where the calculated maximum temperature was well below the boiling point. However, the mixing was poor and the local temperature where the caustic and water contacted each other was high enough to cause boiling and some caustic erupted from the tank opening (it was a small tank) and splashed somebody.
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