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

  • Andrea Pérez Nebreda , Henrik Grénman EMAIL logo , Päivi Mäki-Arvela , Kari Eränen , Jarl Hemming , Stefan Willför , Dmitry Yu. Murzin EMAIL logo and Tapio Salmi
Published/Copyright: June 1, 2015
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Abstract

Hemicellulose O-acetyl-galactoglucomannan (GGM) is the main noncellulosic water-soluble polysaccharide in 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.


Corresponding authors: Henrik Grénman and Dmitry Yu. Murzin, Laboratory of Industrial Chemistry and Reaction Engineering, Laboratory of Wood and Paper Chemistry, Process Chemistry Centre, Åbo Akademi University, FI-20500 Turku/Åbo Finland, e-mail: (H. Grénman), (D.Y. Murzin)

Acknowledgments

This work is a part of the activities of Process Chemistry Centre, a center of excellence financed by Åbo Akademi University. Financial support from the Academy of Finland (T. Salmi) and Raision Tutkimussäätiö (A. Pérez Nebreda) is gratefully acknowledged.

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Received: 2014-10-22
Accepted: 2015-4-21
Published Online: 2015-6-1
Published in Print: 2016-3-1

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