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Novel insight in carbohydrate degradation during alkaline treatment

  • Kaarlo Nieminen EMAIL logo , Lidia Testova , Markus Paananen and Herbert Sixta
Published/Copyright: March 4, 2015
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Abstract

A mathematical model is presented, in which the yield loss (YL) and the decline in polymerization of carbohydrates is comprehended. The model is applicable to the treatment of cellulose and hemicelluloses in alkaline media, and it features the actions of peeling, stopping, and alkaline hydrolysis of the polymer chains. The peeling reaction is further subdivided into primary and secondary peeling depending on whether it originates from an initial reducing end-group (REG) or from an REG created by alkaline hydrolysis. Fitting the model to experimental data provides estimates of the various reaction rate constants. When available, simultaneous observations of the YL and the decrease in chain length contribute to the evaluation of the parameters. Alternatively, if the data are limited to the YL, the obtained parameter estimates allow for a projection of the time development of chain length. The model has been applied on data from two types of experiments: soda-anthraquinone treatment of cotton linters and kraft treatment of Scots pine. It was possible to evaluate the impact of the different processes on degradation as well as the portions of polymer chains possessing active or stabilized REGs.


Corresponding author: Kaarlo Nieminen, Aalto University, P.O. Box 16400, 00076 Aalto, Finland, e-mail:

Acknowledgments

The authors acknowledge the Finnish Bioeconomy Cluster Oy (FIBIC), The Finnish Funding Agency for Technology and Innovation (Tekes), Andritz Oy, Danisco Sweeteners Oy, Metsä Fibre Oy, Stora Enso Oyj, UPM, and the International Doctoral Programme in Bioproducts Technology for financial support.

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Received: 2014-10-15
Accepted: 2015-2-4
Published Online: 2015-3-4
Published in Print: 2015-8-1

©2015 by De Gruyter

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