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Effect of acetic acid addition on chemical conversion of woods as treated by semi-flow hot-compressed water
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Published/Copyright:
February 25, 2011
Abstract
Effect of acetic acid (AcOH) addition on chemical conversion of Japanese beech (Fagus crenata), as a hardwood, and Japanese cedar (Cryptomeria japonica), as a softwood, was investigated in the course of treatment in a semi-flow reactor with hot-compressed water (H-CW). One-step treatment of Japanese beech was preliminarily performed to examine the effect of AcOH concentrations on the decomposition behavior at 150–290°C/10 MPa/30 min. Based on the obtained results, two-step semi-flow H-CW treatment with 1 wt% AcOH at 210°C/10 MPa/15 min (1st stage) and 260°C/10 MPa/15 min (2nd stage) was thus selected as the most appropriate treatment and a comparative study of the two woods was accordingly conducted. The differences in decomposition behavior observed between the two woods clearly proved that the addition of AcOH played an important role in enhancing the hydrolysis and decomposition of cell wall components in Japanese cedar due to the lesser amount of acetyl residue in softwood hemicelluloses and its lignin structure.
Keywords: acetic acid; chemical conversion; hardwood; hot-compressed water; hydrolysis; Japanese beech; Japanese cedar; softwood
Received: 2010-9-2
Accepted: 2011-1-11
Published Online: 2011-02-25
Published Online: 2011-02-25
Published in Print: 2011-08-01
©2011 by Walter de Gruyter Berlin Boston
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Keywords for this article
acetic acid;
chemical conversion;
hardwood;
hot-compressed water;
hydrolysis;
Japanese beech;
Japanese cedar;
softwood
Articles in the same Issue
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- Lignocellulosic biorefinery: process integration of hydrolysis and fermentation (SSF process)
- Study of stilbene and resin acid content of Scots pine heartwood by electrical impedance spectroscopy (EIS)
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- Two-step hydrolysis of nipa (Nypa fruticans) frond as treated by semi-flow hot-compressed water
- Effect of acetic acid addition on chemical conversion of woods as treated by semi-flow hot-compressed water
- Oxidative cleavage of non-phenolic β-O-4 lignin model dimers by an extracellular aromatic peroxygenase
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