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Reducing dissolving time

Q: We are using a mixing system including v=40000lit,d=1m rpm=56 visc=120-800cst mixer type=pitched turbine kw=2.4. We want to reduce dissolving time by upgrading mixer diameter or rpm. Which one is the best selection for this viscous liquid? What about the other required changes followed selected upgrading? What about the amount of increasing diameter or rpm?

A:

Based on this information,  viscosity and mixing intensity should be sufficient to suspend particles being  dissolved.  Assuming particles are in suspension, increased mixing  intensity is not likely to reduce dissolving time.  Mixing intensity has  little effect on dissolving time, once all particles are suspended.   Reduced dissolving time will probably require increased temperature or reduced  particle sizes.
 
If you doubt these  recommendations, test the effect of increased mixing intensity by reducing  batch size to 35,000 liters. 

Same Mixer & Reduced  Volume  =  Increased Mixing Intensity
 

If operating at a reduced batch size (increased  mixing intensity) reduces dissolving time, then consider mixer  modifications.  Otherwise consider other process changes.