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

• Autorzy: Piotrowski K. , Wierzbowska B. , Koralewska J. , Matynia A.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

vitamin C; batch crystallization; neural networks; crystallization temperature

PL

witamina C; krystalizacja okresowa; sieć neuronowa; temperatura krystalizacji

• Wydawca: West Pomeranian University of Technology. Publishing House
• Czasopismo: Polish Journal of Chemical Technology
• Rocznik: 2006
• Tom: Vol. 8, nr 4
• Strony: 23--26
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Piotrowski K.

autor

Wierzbowska B.

autor

Koralewska J.

autor

Matynia A.

• Silesian University of Technology, Department of Chemical & Process Engineering, ul. Strzody 7, 44-101 Gliwice,

Bibliografia

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• (2) Boudrant J.: Microbial processes for ascorbic acid biosynthesis: a review, Enzyme Microb. Technol., 1990, 12, 322.
• (3) Šnajdman L. O.: Proizvodstvo vitaminov, Piščevaja promyšlennost, Moskva, 1973.
• (4) Matynia A., Wierzbowska B., Bechtold Z., Kozak E.: Nucleation of vitamin C, in: Proceedings of the 14th Symposium on Industrial Crystallization, CD-ROM, No. 0090, Inst. Chem. Eng., UK, 1999.
• (5) Freitas A. M. B., Giulietti M.: Crystallization of L-ascorbic acid from aqueous solutions, in: Proceedings of the 15th Symposium on Industrial Crystallization, Vol. 1, No. 232, Edited by Angelo Chianese, Sorrento, Italy, 2002.
• (6) Matynia A., Wierzbowska B., Bechtold Z.: Crystal growth of L(+)-ascorbic acid in batch crystallizer, Pol. J. Chem. Technol., 2000, 2, 1, 14.
• (7) Wierzbowska B., Matynia A., Bechtold Z., Małasińska M.: Crystallization capacity in the L(+)-ascorbic acid-methanol-ethanol-water system, Inż. Chem. Proc, 2004, 25, 1771.
• (8) Tambe S. S., Kulkarni B. D., Deshpande P. B.: Elements of Artificial Neural Networks with selected applications in Chemical Engineering and Chemical & Biological Sciences, Simulation & Advanced Controls, Inc., Louisville, KY, USA, 1992