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TUD - Crystal Growth in an Airlift Crystallizer

Last updated 992 days ago by Albert Verver


NL GUTS Group of Users of Technology for Separation in the Netherlands


20121204 TUD (Technical University Delft) - Mrs. Anamaria Soare – Optimizing Crystal Growth in an Airlift Crystallizer

The VVVVVV Group of TUD investigates the features of a crystallizer using airlift to reduse the shear stress on crystals normally observed in stirred crystallizers as part of the Task Based design Approach program. Work was executed in a concentrated (NH4)2SO4 solution in water, using laser induced cavitation to generate rather uniform nuclei.

The work indicates that air sparger configuration, gas entrainment, air bubble disengagement, air flow rate and seed load affect the final crystal size and crystal size distribution. It was demonstrated that the airlift crystallizer produces crystals near the ideal crystal size-seed load line. Growth was not limited by diffusion.

Further research is on-going to identify process optima. www.tud.nl


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