Potential of hot water extraction of birch wood to produce high-purity dissolving pulp after alkaline pulping

Borrega, Marc; Tolonen, Lasse; Bardot, Fanny; Testova, Lidia; Sixta, Herbert

doi:10.1016/j.biortech.2012.11.107

Cited by 98 publications

(86 citation statements)

References 25 publications

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“…The mass fraction of molecules with a DP lower than 100 decreased at first, due to the degradation of the xylan, but increased at extended extraction times, due to the degradation and shortening of cellulose chains. Increasing the intensity of HWE of wood prior to soda-AQ pulping has been reported to have similar effects on the MMD of pulp (Borrega et al 2013a). …”

Section: Effects Of Hot Water Extraction On the Cellulose Fractionmentioning

confidence: 86%

“…In the last years, several research efforts have been directed towards producing dissolving pulp by applying a hot water extraction (HWE) to the lignocellulosic material before alkaline pulping (Borrega et al 2013a;Li et al 2010;Reguant et al 1997;Ribas Batalha et al 2011;Schild and Sixta 2011). This approach is similar to the existing industrial PHK process, but the vapor phase is replaced by a liquid water prehydrolysis, and Kraft pulping is often replaced by a non-sulphur sodaanthraquinone (SAQ) pulping.…”

Section: Introductionmentioning

confidence: 99%

“…A reduction in cellulose DP appears to occur even when mild extraction conditions are applied (Duarte et al 2011). In a subsequent alkaline pulping process, particularly following an intense HWE, the yield of cellulose dramatically decreases due to peeling reactions that start at the reducing ends (Borrega et al 2013a;Testova et al 2013). Therefore, a combined HWE and alkaline pulping appears to be suitable to produce dissolving pulps for viscose applications, but other specialty products like cellulose acetate may only be produced from lignocellulosic materials with a low hemicellulosic content.…”

Section: Introductionmentioning

confidence: 99%

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Purification of cellulosic pulp by hot water extraction

Borrega

Sixta

2013

Cellulose

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Hot water extraction (HWE) of pulp in a flow-through reactor was evaluated as a method to purify paper-grade pulps. About 50-80 % of the xylan and up to 50 % of the lignin in unbleached birch Kraft pulp was extracted by the HWE without losses in cellulose yield. The residual xylan content in the extracted pulps was predominantly too high for dissolving-grade applications, but some of the pulps with a xylan content of 5-7 % might still be suitable as rayon-grade pulps. Increasing extraction temperature lowered the xylan content at which cellulose yield started to decrease. Furthermore, at any given xylan content, increasing extraction temperature resulted in cellulosic pulp with higher degree of polymerization. The extracted xylan was recovered almost quantitatively as xylo-oligosaccharides. The results suggest that HWEs at elevated temperatures may be applied to purify cellulosic pulps, preferably containing a low xylan content, and to recover the extracted sugars.

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Section: Effects Of Hot Water Extraction On the Cellulose Fractionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Purification of cellulosic pulp by hot water extraction

Borrega

Sixta

2013

Cellulose

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“…This goal can be achieved by a hot water extraction (also called autohydrolysis, hydrothermal treatment, or water prehydrolysis) (Yáñez et al 2009;Helmerius et al 2010;Gullón et al 2011;Vila et al 2012), which is considered to be an environmentally friendly technology and enables a selective separation of soluble hemicellulose-derived saccharides, while the solid phase residue is enriched in cellulose and lignin. The latter can be further fractionated via autohydrolysis, for example, to produce pulp (Helmerius et al 2010), dissolve pulp (Borrega et al 2013;Testova et al 2014), microcrystalline cellulose (Vila et al 2014), or sugar solutions suitable as fermentation media for the biotechnological manufacture of chemicals or fuels (Garrote et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Furfural production from birch hemicelluloses by two-step processing: a potential technology for biorefineries

et al. 2016

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Birch samples were subjected to non-isothermal autohydrolysis to obtain a solution of hemicellulosic saccharides and a solid phase mainly made up of cellulose and lignin. Based on kinetic modeling, operational conditions were identified which give rise to soluble saccharides and furfural derived from xylan in a yield of 80.5%. The soluble mixture was supplemented with 1% sulfuric acid and heated (directly or in the presence of methyl isobutyl ketone, MIBK) for furfural production. MIBK is used as an extraction agent to limit furfural consumption by side reactions. Operating in single phase at 170°C, up to 44.8% of the potential substrates were converted into furfural. In experiments performed in biphasic media, the effects of MIBK were assessed by empirical modeling and about 75% of the potential substrates were converted under selected conditions.

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“…In addition to the varying chemical composition of the produced aqueous pretreatment liquors, pretreatments have an effect on the chemical and morphological composition of the pretreated wood and also on the subsequent delignification behavior of the pretreated material (Duarte et al 2011;Borrega et al 2013;dos Santos Muguet et al 2013;Huang and Ragauskas 2013a,b). In particular, hot-water extraction and dilute acid pretreatments have been proposed to enhance the delignification rates compared with untreated feedstocks (Yoon and van Heiningen 2008;Lu et al 2012;Chirat et al 2013;Hamaguchi et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Organic Material Dissolved During Oxygen-Alkali Pulping of Hot-Water-Extracted Spruce Sawdust

Lehto¹,

Alén²

2016

BioResources

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Untreated and hot-water-extracted (HWE) Norway spruce (Picea abies) sawdust was cooked using the sulfur-free oxygen-alkali (OA) method under the following conditions: temperature, 170 °C; liquor-to-wood ratio, 5:1 L/kg; and NaOH charge, 19% on the oven-dry sawdust. In comparison with earlier studies conducted with birch sawdust, the spruce cooking yield data, together with the amount of the pulp rejects (78% to 86% for reference pulps from the initial feedstock and 73% to 83% for pulps from the HWE feedstock), revealed that the pretreatment stage prior to spruce OA pulping caused different effects on pulping performance. The analyses of the three main compound groups (i.e., lignin, volatile acids, and hydroxy acids) in black liquor indicated that slightly higher contents (25.5 to 45.9 g/L) of dissolved lignin were detected in black liquors originating from the HWE sawdust than in the black liquors from the reference material (27.2 to 39.6 g/L). In contrast, considerably lower (~20% decrease) volatile acid contents and similar or slightly decreased hydroxy acids contents were detected in the black liquors from the HWE sawdust.

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Potential of hot water extraction of birch wood to produce high-purity dissolving pulp after alkaline pulping

Cited by 98 publications

References 25 publications

Purification of cellulosic pulp by hot water extraction

Purification of cellulosic pulp by hot water extraction

Furfural production from birch hemicelluloses by two-step processing: a potential technology for biorefineries

Organic Material Dissolved During Oxygen-Alkali Pulping of Hot-Water-Extracted Spruce Sawdust

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