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Scale-up of high-solid enzymatic hydrolysis of steam-pretreated softwood: the effects of reactor flow conditions

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Abstract

The importance of flow conditions during scale-up of high-solid enzymatic hydrolysis of steam-pretreated spruce was demonstrated by comparing hydrolysis rates between laboratory (2 L) and demonstration (4 m3) scale. A positive effect of increased agitation speed on the rate of enzymatic hydrolysis was found regardless of scale. Importantly, the hydrolysis rate was higher at the larger scale when compared at similar specific power inputs. Changes in the rheological properties of the pretreated material during the hydrolysis were followed by off-line measurements of apparent viscosity. This information was used to estimate the flow conditions in the reactors, i.e., average Reynolds numbers, which together with measured mixing power consumptions enabled a more detailed comparison between the scales. The hydrolysis yields correlated better with average Reynolds numbers than specific power input over the different scales. This indicates that mass transport limitations, caused by insufficient bulk flow, likely play a decisive role in determining the rate of enzymatic hydrolysis.

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Funding

This study was funded by the Swedish Energy Agency (grant numbers 37896–1 and 35353–1).

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Author notes

  1. Benny Palmqvist

    Present address: Novozymes A/S, Krogshoejvej 36, 2880, Bagsvaerd, Denmark

Authors and Affiliations

  1. Department of Chemical Engineering, Lund University, Box 124, 221 00, Lund, Sweden

    Benny Palmqvist, Adnan Kadić & Gunnar Lidén

  2. SEKAB E-Technology AB, Box 286, 891 26, Örnsköldsvik, Sweden

    Karin Hägglund

  3. SP Technical Research Institute of Sweden, Ideon, 223 70, Lund, Sweden

    Anneli Petersson

Authors
  1. Benny Palmqvist
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  2. Adnan Kadić
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  4. Anneli Petersson
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  5. Gunnar Lidén
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Correspondence to Adnan Kadić.

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Palmqvist, B., Kadić, A., Hägglund, K. et al. Scale-up of high-solid enzymatic hydrolysis of steam-pretreated softwood: the effects of reactor flow conditions. Biomass Conv. Bioref. 6, 173–180 (2016). https://doi.org/10.1007/s13399-015-0177-3

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  • DOI: https://doi.org/10.1007/s13399-015-0177-3

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