Supercritical water hydrolysis : a green pathway for producing low-molecular-weight cellulose

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http://hdl.handle.net/10138/224413

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Buffiere , J , Ahvenainen , P , Borrega , M , Svedström , K & Sixta , H 2016 , ' Supercritical water hydrolysis : a green pathway for producing low-molecular-weight cellulose ' , Green Chemistry , vol. 18 , no. 24 , pp. 6516-6525 . https://doi.org/10.1039/c6gc02544g

Title: Supercritical water hydrolysis : a green pathway for producing low-molecular-weight cellulose
Author: Buffiere, Jean; Ahvenainen, Patrik; Borrega, Marc; Svedström, Kirsi; Sixta, Herbert
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2016
Language: eng
Number of pages: 10
Belongs to series: Green Chemistry
ISSN: 1463-9262
URI: http://hdl.handle.net/10138/224413
Abstract: This work discusses the suitability of supercritical water treatment (SCWT) for depolymerising microcrystalline cellulose in a controlled way. The SCWT partially hydrolysed cellulose down to a mixture of three valuable products: water-insoluble low-molecular-weight cellulose (WI-LMWC) precipitate, water-soluble low-molecular-weight cellulose (WS-LMWC) oligomers, and glucose. The conditions under which the energy demand for obtaining these products is minimised were identified by adjusting the reaction time inside the continuous reactor and the temperature around the critical point. The optimum conditions were 370 degrees C and 0.4 seconds for producing WI-LMWC and 360 degrees C and 0.5 seconds for producing WS-LMWC, with maximum yields of 19 wt% and 50 wt%, respectively. This work also shows that the water-insoluble product precipitates into crystalline cellulose II arrangements. This precipitation phenomenon enabled isolation of cellulose chains of different lengths according to their respective solubilities in ambient water. The results show that SCWT is a relevant process for producing narrowly distributed fractions of low-molecular-weight cellulose using water and heat only.
Subject: SYNCHROTRON X-RAY
MICROCRYSTALLINE CELLULOSE
ACID
CRYSTALLINITY
TEMPERATURE
DIFFRACTION
CONVERSION
KINETICS
PLATFORM
WOOD
114 Physical sciences
116 Chemical sciences
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