Abstract
From birch wood, it is possible to obtain both acetic acid and 2-furaldehyde as valuable value-added products. The main objective of this study was to develop a new wasteless technology for obtaining 2-furaldehyde, acetic acid, and lignocellulose (LC) residue usable as feedstock in further processing such as thermomechanical (TMP), alkaline peroxide mechanical (APMP), and sulfate pulping processes. To achieve this objective several screening tests were performed, and a further experimental plan was developed using DesignExpert11. Process yields were analyzed both in terms of total yield and at individual time increments. In addition, the obtained LC residue was also characterized. A unique bench-scale reactor system was used to obtain an LC material without pentoses and with maximum preservation of cellulose fiber for further research. Studies on the deacetylation and dehydration of birch wood hemicelluloses of pentose monosaccharides to 2-furaldehyde and acetic acid using orthophosphoric acid as a catalyst were carried out. Results showed that, depending on the used pre-treatment conditions, the 2-furaldehyde yield was from 0.04% to 10.84% oven dry mass (o.d.m.), the acetic acid yield was from 0.51% to 6.50% o.d.m., and the LC residue yield was from 68.13% to 98.07% o.d.m. with minimal content of admixtures. Process optimization using DesignExpert11 revealed that the main pre-treatment process parameters that influenced the yield of 2-furaldehyde in the pre-treatment process were process temperature (53.3%) and process duration (29.8%).
Highlights
As oil plays a significant role in the global economy, the rapidly growing consumption of fossil energy resources and the overall decline in oil reserves led to the global energy crisis [1]
The scientific goal of this study was to carry out interdisciplinary research for the processing of birch wood in 2-furaldehyde and acetic acid, while simultaneously preserving the LC residue so that it can be used in pulp production
Xylose is a feedstock in the catalyzed pre-treatment process to obtain 2-furaldehyde and acetic acid, while the glucose-containing LC residue can be used in further processing into fiber materials
Summary
As oil plays a significant role in the global economy, the rapidly growing consumption of fossil energy resources and the overall decline in oil reserves led to the global energy crisis [1]. The scientific goal of this study was to carry out interdisciplinary research for the processing of birch wood in 2-furaldehyde and acetic acid, while simultaneously preserving the LC residue so that it can be used in pulp production. This would show that these two different technological processes can be combined into one biorefinery technology chain that has not been possible so far. The technology will comprise a deciduous wood pre-treatment process, as a result of which valuable products (2-furaldehyde, acetic acid, and LC) will be obtained. GlucosOer, t(h≥o9p5h%o)s,pDh-o(+ri)c-xaycliodse(8(5≥%9)9,%su),lLfu-(r+ic)-aacraidbi(n9o5s–e9(7≥%9)9, %D)-,(+D)--(c+e)ll-ogbaliaocsteos(≥e9(9≥%9)9,%D)-,(D+)-(+gl)u-mcoasnen, o(≥se95(≥%9),9D%-)(,+2)--fxuyrlaolsdeeh(≥y9d9e%(≥), 9L9-%(+)),-aarcaebtiicnaocsied((≥≥999%9%),),D5--(h+y)-dgraolxaycmtoeseth(y≥l9fu9%rfu),raDl((≥+9)-9m%a)n, nleovsueli(n≥i9c9a%c)i,d2(-≥fu9r8a%ld)e, haynddefo(≥rm99i%c )a,caidce(t≥ic9a5c%id) w(≥e9r9e%p)u, r5c-hhaysderdoxfryommetMhyelrfcukrfaunrdal used without further purification
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