Selecting the Desired
Solid Form by Membrane Crystallizers:
Crystals or Cocrystals
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Abstract
This work aims to describe a systematic study on the
conditions
promoting the selective formation of carbamazepine-saccharin cocrystals
or single component crystals from water/ethanol solvent mixtures,
by using a membrane crystallization process. Results revealed the
ability to operate in the proper zone of the phase diagram of the
system when opportunely choosing the initial solution conditions and
limiting the maximum level of supersaturation by using the membrane-based
technology. Control in the selective crystallization of a specific
solid form can be achieved by adjusting the solvent evaporation through
the micropores of the membrane. Furthermore, the direct correlation
between transmembrane flow and polymorphic composition in the case
of carbamazepine precipitation confirmed the possibility to produce
particular metastable phases upon increasing the supersaturation rate