O2 as initiator of autocatalytic degradation of hemicelluloses and monosaccharides in hydrothermal treatment of spruce

Jussi V. Rissanen; Lucas Lagerquist; Kari Eränen; Jarl Hemming; Patrik Eklund; Henrik Grènman

doi:10.1016/j.carbpol.2022.119740

O₂ as initiator of autocatalytic degradation of hemicelluloses and monosaccharides in hydrothermal treatment of spruce

Jussi V. Rissanen
, Lucas Lagerquist
, Kari Eränen
, Jarl Hemming
, Patrik Eklund
, Henrik Grènman^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

6 Citations (Scopus)

258 Downloads (Pure)

Abstract

The influence of oxygen (0–50 bar) on the molar mass and composition of hemicelluloses after hydrothermal treatment of spruce chips was studied in a batch reactor setup at 130 °C–160 °C. Purified galactoglucomannan was studied as a reference. The dissolved oxygen enhanced significantly the depolymerization of hemicelluloses from over 15,000 g/mol to 180 g/mol (monomers) as well as promoted acids formation from the monosaccharides. About 2–3 times faster depolymerization was observed already with rather low amounts of oxygen (2–8 bar), while the kinetics of depolymerization was significantly slower in inert atmosphere. The decrease in pH from neutral to as low as 2.5 lead to an autocatalytic effect on the polysaccharide hydrolysis and the consecutive reactions of monosaccharides. The results emphasize the importance of performing hydrothermal treatment under inert atmosphere if large polymeric hemicellulsoses are desired or if monosaccharides are targeted in hydrolysis of hemicelluloses. If autocatalysis begins, it is difficult to stop.

Original language	English
Article number	119740
Journal	Carbohydrate Polymers
Volume	293
DOIs	https://doi.org/10.1016/j.carbpol.2022.119740
Publication status	Published - 1 Oct 2022
MoE publication type	A1 Journal article-refereed

Funding

This work is a part of the activities of the Johan Gadolin Process Chemistry Centre at Åbo Akademi University. The authors gratefully acknowledge the financial support from the Academy of Finland (Grant number 310652 ). Additionally, the authors are grateful for CH-Bioforce for supplying the hemicellulose concentrate and, Dr. Otto Långvik and Dr. Andrey Pranovich for precipitating and performing analysis on the GGM-sample. This work is a part of the activities of the Johan Gadolin Process Chemistry Centre at Åbo Akademi University. The authors gratefully acknowledge the financial support from the Academy of Finland (Grant number 310652). Additionally, the authors are grateful for CH-Bioforce for supplying the hemicellulose concentrate and, Dr. Otto Långvik and Dr. Andrey Pranovich for precipitating and performing analysis on the GGM-sample.

Keywords

Depolymerization
Galactoglucomannan
Hemicelluloses
Hydrothermal extraction
Kinetics
Oxygen

Access to Document

10.1016/j.carbpol.2022.119740Licence: CC BY

1-s2.0-S0144861722006452-mainFinal published version, 4.97 MBLicence: CC BY

https://urn.fi/URN:NBN:fi-fe2023020926410

Cite this

@article{35b307146b5347a091e6d92abd8821cf,

title = "O2 as initiator of autocatalytic degradation of hemicelluloses and monosaccharides in hydrothermal treatment of spruce",

abstract = "The influence of oxygen (0{\textendash}50 bar) on the molar mass and composition of hemicelluloses after hydrothermal treatment of spruce chips was studied in a batch reactor setup at 130 °C{\textendash}160 °C. Purified galactoglucomannan was studied as a reference. The dissolved oxygen enhanced significantly the depolymerization of hemicelluloses from over 15,000 g/mol to 180 g/mol (monomers) as well as promoted acids formation from the monosaccharides. About 2{\textendash}3 times faster depolymerization was observed already with rather low amounts of oxygen (2{\textendash}8 bar), while the kinetics of depolymerization was significantly slower in inert atmosphere. The decrease in pH from neutral to as low as 2.5 lead to an autocatalytic effect on the polysaccharide hydrolysis and the consecutive reactions of monosaccharides. The results emphasize the importance of performing hydrothermal treatment under inert atmosphere if large polymeric hemicellulsoses are desired or if monosaccharides are targeted in hydrolysis of hemicelluloses. If autocatalysis begins, it is difficult to stop.",

keywords = "Depolymerization, Galactoglucomannan, Hemicelluloses, Hydrothermal extraction, Kinetics, Oxygen, -",

author = "Rissanen, \{Jussi V.\} and Lucas Lagerquist and Kari Er{\"a}nen and Jarl Hemming and Patrik Eklund and Henrik Gr{\`e}nman",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2022",

month = oct,

day = "1",

doi = "10.1016/j.carbpol.2022.119740",

language = "English",

volume = "293",

journal = "Carbohydrate Polymers",

issn = "0144-8617",

publisher = "Elsevier",

}

TY - JOUR

T1 - O2 as initiator of autocatalytic degradation of hemicelluloses and monosaccharides in hydrothermal treatment of spruce

AU - Rissanen, Jussi V.

AU - Lagerquist, Lucas

AU - Eränen, Kari

AU - Hemming, Jarl

AU - Eklund, Patrik

AU - Grènman, Henrik

PY - 2022/10/1

Y1 - 2022/10/1

N2 - The influence of oxygen (0–50 bar) on the molar mass and composition of hemicelluloses after hydrothermal treatment of spruce chips was studied in a batch reactor setup at 130 °C–160 °C. Purified galactoglucomannan was studied as a reference. The dissolved oxygen enhanced significantly the depolymerization of hemicelluloses from over 15,000 g/mol to 180 g/mol (monomers) as well as promoted acids formation from the monosaccharides. About 2–3 times faster depolymerization was observed already with rather low amounts of oxygen (2–8 bar), while the kinetics of depolymerization was significantly slower in inert atmosphere. The decrease in pH from neutral to as low as 2.5 lead to an autocatalytic effect on the polysaccharide hydrolysis and the consecutive reactions of monosaccharides. The results emphasize the importance of performing hydrothermal treatment under inert atmosphere if large polymeric hemicellulsoses are desired or if monosaccharides are targeted in hydrolysis of hemicelluloses. If autocatalysis begins, it is difficult to stop.

AB - The influence of oxygen (0–50 bar) on the molar mass and composition of hemicelluloses after hydrothermal treatment of spruce chips was studied in a batch reactor setup at 130 °C–160 °C. Purified galactoglucomannan was studied as a reference. The dissolved oxygen enhanced significantly the depolymerization of hemicelluloses from over 15,000 g/mol to 180 g/mol (monomers) as well as promoted acids formation from the monosaccharides. About 2–3 times faster depolymerization was observed already with rather low amounts of oxygen (2–8 bar), while the kinetics of depolymerization was significantly slower in inert atmosphere. The decrease in pH from neutral to as low as 2.5 lead to an autocatalytic effect on the polysaccharide hydrolysis and the consecutive reactions of monosaccharides. The results emphasize the importance of performing hydrothermal treatment under inert atmosphere if large polymeric hemicellulsoses are desired or if monosaccharides are targeted in hydrolysis of hemicelluloses. If autocatalysis begins, it is difficult to stop.

KW - Depolymerization

KW - Galactoglucomannan

KW - Hemicelluloses

KW - Hydrothermal extraction

KW - Kinetics

KW - Oxygen

KW - -

UR - https://www.scopus.com/pages/publications/85132526658

U2 - 10.1016/j.carbpol.2022.119740

DO - 10.1016/j.carbpol.2022.119740

M3 - Article

C2 - 35798433

AN - SCOPUS:85132526658

SN - 0144-8617

VL - 293

JO - Carbohydrate Polymers

JF - Carbohydrate Polymers

M1 - 119740

ER -