Tailoring the Structure and Morphology of Low-Molecular-Weight Cellulose Produced during Supercritical Water Hydrolysis

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http://hdl.handle.net/10138/308201

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Buffiere , J , Abad , N , Ahvenainen , P , Dou , J , Jose Cocero , M & Sixta , H 2018 , ' Tailoring the Structure and Morphology of Low-Molecular-Weight Cellulose Produced during Supercritical Water Hydrolysis ' , ACS Sustainable Chemistry & Engineering , vol. 6 , no. 12 , pp. 16959-16967 . https://doi.org/10.1021/acssuschemeng.8b04296

Title: Tailoring the Structure and Morphology of Low-Molecular-Weight Cellulose Produced during Supercritical Water Hydrolysis
Author: Buffiere, Jean; Abad, Nerea; Ahvenainen, Patrik; Dou, Jinze; Jose Cocero, Maria; Sixta, Herbert
Contributor: University of Helsinki, Department of Physics
Date: 2018-12
Language: eng
Number of pages: 17
Belongs to series: ACS Sustainable Chemistry & Engineering
ISSN: 2168-0485
URI: http://hdl.handle.net/10138/308201
Abstract: This paper discusses the influence of reactor design and initial consistency when partially hydrolyzing microcrystalline cellulose (MCC) in supercritical water. Experiments conducted on two pilot reactors located in Finland and in Spain showed that stopping the reaction using depressurization instead of quenching, combined with a sufficiently high MCC consistency, led to significant change in reaction kinetics. A complete particle size reduction was achieved after 50 ms only due to additional shear induced degradation, with a low-molecular-weight product yield above 50 wt % and an average DP of 25. In addition, gradually increasing the MCC consistency triggered precipitation under higher apparent temperature, which affected both the morphology and structure of the product. A range of particles from ribbon-like cellulose II to shish-kebab structures to lamellar cellulose IVII crystals was obtained. Furthermore, heat requirements as low as 66 kJ.g(-1) of product confirm the high potential and versatility of this process for refining MCC into colloidal low-molecular-weight cellulose with different particle shapes and structural properties.
Subject: Carbohydrates
Cellulose
Hydrolysis
Hydrothermal treatment
Supercritical water
Water chemistry
SYNCHROTRON X-RAY
MICROCRYSTALLINE CELLULOSE
SINGLE-CRYSTALS
REGENERATED CELLULOSE
MECHANICAL-PROPERTIES
KINETICS
DISSOLUTION
116 Chemical sciences
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