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Dissolution kinetics of Ca-maleate crystals: Evaluation for biotransformation reactor design by Marco J. F. Michielsen; Karin A. Reijenga; René H. Wijffels; Hans Tramper; Rik H. Beeftink is a Engineering article available to read on EtoBox.

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In order to develop a bioreactor for solid to solid conversions the biocatalytic conversion of solid Ca-maleate to solid Ca-D-malate is studied. The dissolution of Ca-maleate is the Ðrst step in this process and is described here. A kinetic model, based on the interfacial-barrier theory and the di †usion-layer theory, was developed which describes the increase in Ca-maleate concentration due to dissolution with the help of the time-dependent parameters. According to the model two processes contribute to the dissolution of crys-Ca-maleate É H 2 O tals : (1) the dissolution (and dissociation) reaction of Ca-maleate at the solidÈ liquid interface, characterized by a time-independent reaction rate coefficient, and (2) the transport of Ca2`and maleate2~across a boundary liquid Ðlm, characterized by a time-dependent mass-transfer rate coefficient. In addition, the surface of a crystal and the driving force are time-dependent variables. Since crystals are not uniform, a crystal-size distribution was also Ca-maleate É H 2 O used in the model. The e †ects of stirring speed, temperature, pH, and initial Ca2c oncentration on the dissolution rate of crystals were deter-Ca-maleate É H 2 O mined

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Author

Marco J. F. Michielsen; Karin A. Reijenga; René H. Wijffels; Hans Tramper; Rik H. Beeftink

Publisher

Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0268-2575)

Published

1998

Language

EN

Field

Engineering (Physical Sciences)