Parameters determining the agglomeration behavior of anhydrous L-ornithine-L-aspartate (LOLA) crystals prepared by drowning out crystallization |
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Authors: | Yehoon Kim Seungjoo Haam Woo-Sik Kim Kee-Kahb Koo |
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Affiliation: | (1) Department of Chemical Engineering, Yonsei University, 120-749 Seoul, Korea;(2) Department of Chemical Engineering, Sogang University, 121-742 Seoul, Korea |
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Abstract: | Crystallization of L-ornithine-L-aspartate (LOLA) by drowning out was performed for the production of the anhydrous form of
LOLA. The needle-like LOLA crystals were formed and spherically agglomerated during precipitation in a semibatch crystallizer.
The primary crystal size in the agglomerate remains unchanged after completion of the crystallization. Therefore, the agglomeration
process of primary crystals played an important role for controlling LOLA crystal size. The agglomeration of LOLA crystals
was governed by not only the physico-chemical parameters such as the temperature and feed concentration, but also the hydrodynamic
parameters such as agitation speed and feeding rate. The crystal size and the shape have been shown to be important factors
in product impurity and flowability. Thus, the optimum condition of LOLA crystallization process by drowning-out could be
obtained. |
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Keywords: | Drowning-out L-ornithine-L-aspartate Pseudopolymorph Agglomeration Impurity |
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