Acid hydrolysis of O-acetyl-galactoglucomannan in a continuous tube reactor: a new approach to sugar monomer production

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Andrea Pérez Nebreda, Henrik Grénman, Päivi Mäki-Arvela, Kari Eränen, Jarl Hemming, Stefan Willför, Dmitry Yu. Murzin, Tapio Salmi
Publication year: 2016
Journal: Holzforschung
Volume number: 70
Issue number: 3
Start page: 187
End page: 194
eISSN: 1437-434X


Abstract

Hemicellulose O-acetyl-galactoglucomannan (GGM) is the main noncellulosic water-soluble polysaccharidein the coniferous softwood Norway spruce, consisting of anhydro-galactose, -glucose, and -mannose. Acid hydrolysis of GGM has been studied in a continuous tube reactor to obtain these sugars under industrially relevant conditions. The reaction was performed under atmospheric pressure at 90°C and 95°C, and hydrochloric acid (HCl) served as catalyst. The influence of the reaction parameters, such as acid concentration (pH), temperature, concentration of the substrate, as well as catalyst and reactant flow rates, has been studied on the conversion efficiency and product distribution. Continuous production of monomeric sugars was achieved without formation of low-molecular by-products. The GGM conversion was high with HCl as catalyst, at 95°C, and a pH of 0.3. The main hydrolysis products were mannose, glucose, and galactose monomers. Minor amounts of sugar dimers were detected among the products. The experimental results are described with a laminar flow model for the continuous reactor.

Last updated on 2019-21-07 at 06:52