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- W1604940963 abstract "Abstract The paper discusses the modelling of xylose hydrogenation kinetics over Raney nickel in aqueous solutions, the determination of the hydrogen solubility in the reaction mixture as well as evaluation of mass-transfer effects in the reaction system. The hydrogenation experiments were carried out batchwise in an automatic laboratory scale reactor operating at 40 – 70 bar and at between 80 and 140 °C. The catalyst-to-xylose ratio was approximately 5 wt-% of the xylose weight. The reactor contents were analysed off-line with a high performance liquid chromatograph. The solubility of hydrogen in the reaction medium was determined with a gas-chromatographic system. The solubility was found to remain fairly constant during the hydrogenation. Only a slight increase in the hydrogen solubility was detected as xylose was hydrogenated to xylitol. The main hydrogenation product was xylitol, but small amounts of xylulose and arabinitol were detected as by-products. A semi-competitive kinetic model, based on hydrogen and xylose adsorption was developed. The parameters of the kinetic model were determined with non-linear regression analysis. It turned out that the kinetic model is able to describe the formation of both xylitol and the by-products. The mass-transfer effects in the batch hydrogenation were evaluated by using measured viscosities and estimated diffusion and mass-transfer coefficients. A process simulator, utilizing the kinetic and mass transfer effects, was developed to predict the behaviour of industrial reactors." @default.
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- W1604940963 date "1999-01-01" @default.
- W1604940963 modified "2023-10-16" @default.
- W1604940963 title "Kinetic and mass-transfer effects in the hydrogenation of xylose to xylitol" @default.
- W1604940963 cites W1987219169 @default.
- W1604940963 cites W2002702944 @default.
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- W1604940963 doi "https://doi.org/10.1016/s0167-2991(99)80166-9" @default.
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