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Interconversion of Lactose to Lactulose in Alkaline Environment: Comparison of Different Catalysis Concepts

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Abstract

Interconversion of lactulose to lactulose with the aim to determine and optimize the yield of ketose was carried out. Various homogenous and heterogeneous alkaline catalysts were applied (NaOH, MgO, hydrotalcite etc.). The selectivity and activity of the catalysts were compared. The results gave insight to the performance differences among the screened catalysts under the various reaction conditions. From the activity performance point of view, the conversion was limited by the formation of acidic end-products. In general, the selectivity decreased with conversion and the conversion-selectivity pattern was independent of the catalyst.

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Acknowledgments

This work is a part of Åbo Akademi University Process Chemistry Centre activities within the Academy of Finland, Finnish Centre of Excellence programmes (200–-2011). The authors gratefully acknowledge the support of the Finnish Funding Agency for Technology and Innovation (TEKES) and cooperating industrial partners to URAKAMU project (TEKES BioRefine, No. 2326/31/07). In Sweden, the Bio4Energy programme is acknowledged.

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Authors and Affiliations

  1. Laboratory of Industrial Chemistry and Reaction Engineering, Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, 20500, Turku, Finland

    Jan Hajek, Dmitry Yu. Murzin, Tapio Salmi & Jyri-Pekka Mikkola

  2. Technical Chemistry, Department of Chemistry, Chemical–Biological Center, Umeå University, 90187, Umeå, Sweden

    Jyri-Pekka Mikkola

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  1. Jan Hajek
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  2. Dmitry Yu. Murzin
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  3. Tapio Salmi
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  4. Jyri-Pekka Mikkola
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Correspondence to Jan Hajek.

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Hajek, J., Murzin, D.Y., Salmi, T. et al. Interconversion of Lactose to Lactulose in Alkaline Environment: Comparison of Different Catalysis Concepts. Top Catal 56, 839–845 (2013). https://doi.org/10.1007/s11244-013-0044-z

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