TY - JOUR
T1 - Hydrolysis of semi-industrial aqueous extracted xylan from birch (Betula pendula) employing commercial catalysts
T2 - kinetics and modelling
AU - Lu, Xiaojia
AU - Junghans, Paula
AU - Wärnå, Johan
AU - Hilpmann, Gerd
AU - Lange, Rüdiger
AU - Trajano, Heather
AU - Eränen, Kari
AU - Estel, Lionel
AU - Leveneur, Sebastien
AU - Grénman, Henrik
N1 - Funding Information:
The current study has been performed in the framework of the AMED project financed with the support from the European Union within the European Regional Development Fund (ERDF) and from the Regional Council of Normandie. The China Scholarship Council: Cooperation Program with the UTs and INSAs (France) is gratefully acknowledged for financial support, as is the Åbo Akademi University strategic profiling area Technologies for a Sustainable Future. Additionally, the authors are grateful for CH‐Bioforce for supplying the hemicellulose. k −1 k 0 −1 β X α k ∞ −1 c xylan –1 c xylose –1 c degr. –1 c 0 i i –1 c H+ + –1 k 01/02 −1 −1 E a –1 R –1 θ T T mean Q c exp –1 c est –1 R 2
Publisher Copyright:
© 2021 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).
PY - 2022/1
Y1 - 2022/1
N2 - BACKGROUND: Acidic hydrolysis of a birch (Betula pendula) xylan produced by a novel semi-industrial-scale aqueous-based and highly sustainable method was studied in a batch reactor. Five commercial acidic heterogeneous catalysts were screened and significant differences in their performance were observed. Dowex 50WX2-100 was selected for further studies and the influence of the reaction parameters, including stirring speed, pH (0.5–1.5), temperature (115–145 °C) and catalyst particle size (50–400 mesh) were studied. The goal was to maximize xylose yield by balancing between the kinetics of hydrolysis and the undesired degradation of monosaccharides. RESULTS: The results show that the maximum achieved yield of xylose was 76%, but higher yields were hindered by the consecutive dehydration of sugars. It was also observed that the hydrolysis and dehydration reactions do not follow the same dependence on the experimental parameters, which leaves room for optimization of the yield. A kinetic model was developed based on the data, which takes into account the consecutive reaction pathway and the influence of the experimental conditions, and a very good fit of the model to the experimental data was achieved. An activation energy of 119 and 88 kJ mol–1 was obtained for the hydrolysis and dehydration steps, respectively. CONCLUSION: Hydrolysis results of this novel, well-characterized hemicellulose extract have not been published previously, and they contribute significantly to the understanding of the hydrolysis and dehydration of real feedstock, instead of highly purified and typically very deacetylated model compounds with different characteristics and behaviour in hydrolysis.
AB - BACKGROUND: Acidic hydrolysis of a birch (Betula pendula) xylan produced by a novel semi-industrial-scale aqueous-based and highly sustainable method was studied in a batch reactor. Five commercial acidic heterogeneous catalysts were screened and significant differences in their performance were observed. Dowex 50WX2-100 was selected for further studies and the influence of the reaction parameters, including stirring speed, pH (0.5–1.5), temperature (115–145 °C) and catalyst particle size (50–400 mesh) were studied. The goal was to maximize xylose yield by balancing between the kinetics of hydrolysis and the undesired degradation of monosaccharides. RESULTS: The results show that the maximum achieved yield of xylose was 76%, but higher yields were hindered by the consecutive dehydration of sugars. It was also observed that the hydrolysis and dehydration reactions do not follow the same dependence on the experimental parameters, which leaves room for optimization of the yield. A kinetic model was developed based on the data, which takes into account the consecutive reaction pathway and the influence of the experimental conditions, and a very good fit of the model to the experimental data was achieved. An activation energy of 119 and 88 kJ mol–1 was obtained for the hydrolysis and dehydration steps, respectively. CONCLUSION: Hydrolysis results of this novel, well-characterized hemicellulose extract have not been published previously, and they contribute significantly to the understanding of the hydrolysis and dehydration of real feedstock, instead of highly purified and typically very deacetylated model compounds with different characteristics and behaviour in hydrolysis.
KW - hemicelluloses
KW - heterogeneous catalyst
KW - hydrolysis
KW - industrial feedstock
KW - modelling
KW - xylan
UR - http://www.scopus.com/inward/record.url?scp=85114295671&partnerID=8YFLogxK
U2 - 10.1002/jctb.6918
DO - 10.1002/jctb.6918
M3 - Article
AN - SCOPUS:85114295671
SN - 0268-2575
VL - 97
SP - 130
EP - 139
JO - Journal of Chemical Technology and Biotechnology
JF - Journal of Chemical Technology and Biotechnology
IS - 1
ER -