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1 Polish Journal of Chemical Technology

1 2006

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Influence of methanol and ethanol on vitamin C crystallization temperature - neural network model

Piotrowski K., Wierzbowska B., Koralewska J., Matynia A.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 4

23-26

Addition of aliphatic alcohol improves the yield of the technical vitamin C (L(+)-ascorbic acid) purification process via batch crystallization. Simultaneous presence of two alcohols (methanol and ethanol) in the system, in respect of complex physicochemical interactions, modifies the metastable zone width more effectively than it could be achieved by adding these alcohols individually. This essentially influences batch crystallization process time, as well as the supersaturation discharge dynamics (limiting of excessive primary nucleation and agglomeration). Existence of complex, nonlinear relations in L(+)-ascorbic acid-MeOH-EtOH-H2O system inclined the authors towards the elaboration of its neural network's model.