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Crystallization-induced deracemization offers a simpler batch process for obtaining pure enantiomers. Optimizing seed mass and cooling profiles enhances purity, providing an alternative to temperature cycling methods.

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Area of Science:

  • Chemical Engineering
  • Crystallization Science
  • Chiral Chemistry

Background:

  • Deracemization via temperature cycling is established for enantiomer separation.
  • This method involves temperature fluctuations to isolate desired enantiomers from racemic mixtures.
  • Challenges include throughput limitations related to suspension density.

Purpose of the Study:

  • To investigate crystallization-induced deracemization as an alternative batch process.
  • To analyze the performance and limitations of this method experimentally and through modeling.
  • To identify strategies for enhancing enantiomeric purity in this process.

Main Methods:

  • Experimental analysis of cooling crystallization coupled with liquid-phase racemization.
  • Model-based analysis to understand process dynamics.
  • Investigation of parameters like seed mass, cooling profile, and catalyst concentration.

Main Results:

  • Deracemization via temperature cycles provides high enantiomeric purity but has limited throughput.
  • Crystallization-induced deracemization is simple if the distomer has low nucleation tendency, but solubility limits performance.
  • Purity can be improved using larger seed mass, optimized cooling, or catalyst concentration.

Conclusions:

  • Crystallization-induced deracemization is a viable, simpler alternative to temperature cycling for enantiomer separation.
  • Process performance is influenced by factors including solubility, nucleation, seed mass, and cooling strategy.
  • Purity enhancement strategies involve optimizing operational parameters and potentially partial seed dissolution.