High-temperature pH measuring during hot-water extraction of hemicelluloses from wood

Krogell, Jens; Eränen, Kari; Granholm, Kim; Pranovich, Andrey; Willför, Stefan

doi:10.1016/j.indcrop.2014.06.046

Cited by 15 publications

(4 citation statements)

References 24 publications

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“…A feasible pathway to isolate hemicellulose and consequently reduce the hemicellulose content in the initial LCF is by hot water extraction (Krogell et al 2014). Typically, hot water extraction is done at temperatures above the normal boiling point of water, which allows for a better solubilization of the hemicellulose and depolymerization of polysaccharides (e.g.…”

Section: Introductionmentioning

confidence: 99%

Formic acid aided hot water extraction of hemicellulose from European silver birch ( Betula pendula ) sawdust

Goldmann

Ahola

Mikola

et al. 2017

Bioresource Technology

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Hemicellulose has been extracted from birch (Betula pendula) sawdust by formic acid aided hot water extraction. The maximum amount of hemicellulose extracted was about 70mol% of the total hemicellulose content at 170°C, measured as the combined yield of xylose and furfural. Lower temperatures (130 and 140°C) favored hemicellulose hydrolysis rather than cellulose hydrolysis, even though the total hemicellulose yield was less than at 170°C. It was found that formic acid greatly increased the hydrolysis of hemicellulose to xylose and furfural at the experimental temperatures. The amount of lignin in the extract remained below the detection limit of the analysis (3g/L) in all cases. Formic acid aided hot water extraction is a promising technique for extracting hemicellulose from woody biomass, while leaving a solid residue with low hemicellulose content, which can be delignified to culminate in the three main isolated lignocellulosic fractions: cellulose, hemicellulose, and lignin.

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Section: Introductionmentioning

confidence: 99%

Formic acid aided hot water extraction of hemicellulose from European silver birch ( Betula pendula ) sawdust

Goldmann

Ahola

Mikola

et al. 2017

Bioresource Technology

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“…5 Large quantities of hemicellulose are produced in industries such as pulp mills every year; however, it remains relatively underutilized. 6,7 It consists of heteropolysaccharides that contain a mixture of C6 and C5 sugar units and sugar acids linked together through glycosidic bonds. 5,7 The most important hardwood hemicellulose is xylan, especially O-acetyl-4-O-methylglucuronoxylan, amounting to about 80-90% of the hardwood hemicelluloses.…”

Section: Introductionmentioning

confidence: 99%

Hydrolysis of semi‐industrial aqueous extracted xylan from birch (Betula pendula) employing commercial catalysts: kinetics and modelling

Junghans

Wärnå

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Acidic hydrolysis of a birch (Betula pendula) xylan produced by a novel semi-industrial-scale aqueous-based and highly sustainable method was studied in a batch reactor. Five commercial acidic heterogeneous catalysts were screened and significant differences in their performance were observed. Dowex 50WX2-100 was selected for further studies and the influence of the reaction parameters, including stirring speed, pH (0.5-1.5), temperature (115-145 °C) and catalyst particle size (50-400 mesh) were studied. The goal was to maximize xylose yield by balancing between the kinetics of hydrolysis and the undesired degradation of monosaccharides. RESULTS:The results show that the maximum achieved yield of xylose was 76%, but higher yields were hindered by the consecutive dehydration of sugars. It was also observed that the hydrolysis and dehydration reactions do not follow the same dependence on the experimental parameters, which leaves room for optimization of the yield. A kinetic model was developed based on the data, which takes into account the consecutive reaction pathway and the influence of the experimental conditions, and a very good fit of the model to the experimental data was achieved. An activation energy of 119 and 88 kJ mol -1 was obtained for the hydrolysis and dehydration steps, respectively. CONCLUSION: Hydrolysis results of this novel, well-characterized hemicellulose extract have not been published previously, and they contribute significantly to the understanding of the hydrolysis and dehydration of real feedstock, instead of highly purified and typically very deacetylated model compounds with different characteristics and behaviour in hydrolysis.

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“…Except for the HWT liquor, Table 4 shows relatively similar values for the end pH of studied liquid samples, aside from the BL obtained from the SP1 experimental situation. The relatively low acidic pH value of HWT liquor is a consequence of the formation of residual acids formation [ 73 ]. Although not completely linked to NaOH concentration, an examination of the conductivity values showed that a considerable conductivity drop occurs during the AE and also the pulping stage.…”

Section: Resultsmentioning

confidence: 99%

The Potential Valorization of Corn Stalks by Alkaline Sequential Fractionation to Obtain Papermaking Fibers, Hemicelluloses, and Lignin—A Comprehensive Mass Balance Approach

Puițel,

Bălușescu,

Balan

et al. 2024

Polymers

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The current study deals with an examination of strategies for the sequential treatment of corn stalks (CSs) in an integrated manner aiming to obtain papermaking fibers and to recover both lignin and hemicelluloses (HCs). Several pathways of valorization were experimentally trialed, focusing on getting information from mass balance analysis in an attempt to reveal the potential outcomes in terms of pulp yield, chemical composition, and papermaking properties such as tensile and burst strength. The raw lignin amounts and purity as well as separated hemicelluloses were also characterized. In this work, pulp yields in the range of 44–50% were obtained from CSs, while lignin and hemicelluloses yielded maximum values of 10 g/100 g of CS and 6.2 g/100 g of CS, respectively. Other findings of mass balance analysis evidenced that besides the papermaking pulp, the lignin and HCs also have interesting output values. The recovered lignin yield values were shown to be less than 50% in general, meaning that even if 67 to 90% of it is removed from CSs, only about half is recovered. The removal rates of hemicelluloses were found to be in the range of approx. 30 to 60%. About 15 to 25% of the original HCs could be recovered, and polysaccharides-based products with 67 to 75% xylan content could be obtained. Some key opinions were developed regarding how the mass balance could turn as a result of the chosen CS valorization set-up. The determined antioxidant activity showed that both lignin and hemicelluloses had interesting values for IC50.

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High-temperature pH measuring during hot-water extraction of hemicelluloses from wood

Cited by 15 publications

References 24 publications

Formic acid aided hot water extraction of hemicellulose from European silver birch ( Betula pendula ) sawdust

Formic acid aided hot water extraction of hemicellulose from European silver birch ( Betula pendula ) sawdust

Hydrolysis of semi‐industrial aqueous extracted xylan from birch (Betula pendula) employing commercial catalysts: kinetics and modelling

The Potential Valorization of Corn Stalks by Alkaline Sequential Fractionation to Obtain Papermaking Fibers, Hemicelluloses, and Lignin—A Comprehensive Mass Balance Approach

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