Combined Production of Polymeric Birch Xylan and Paper Pulp by Alkaline Pre-extraction Followed by Alkaline Cooking

Testova, Lidia; Roselli, Annariikka; Costabel, Luciana María; Kovasin, K.; Tenkanen, Maija; Sixta, Herbert

doi:10.1021/ie500694c

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…Hemicelluloses in rapeseed straw consist of xylan and glucomannan . A common method to extract hemicelluloses is through hydrothermal extraction. − Possible applications of hemicelluloses include oxygen barrier films, hydrogels, and reinforcement fillers in plastics. − …”

Section: Introductionmentioning

confidence: 99%

Rapeseed Straw Biorefinery Process

Svärd

Moriana

Brännvall

et al. 2018

ACS Sustainable Chem. Eng.

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A rapeseed straw biorefinery process was demonstrated with more than 50% of the straw recovered as products. Xylan with a weight-average molecular weight of 56 760 g/mol was extracted in an alkaline step. The straw residue was subjected to soda pulping, resulting in cellulose-rich fibers and a lignin-rich liquid fraction. The lignin contained syringyl and guaiacyl aromatic structural units in a 1/0.75 ratio. The cellulose pulp was bleached, resulting in a cellulose fraction of 85% purity and a crystallinity index (CI) of 83%. Two grades of nanocellulose, CNF and CNC, were isolated from the bleached pulp. The CNF was very heterogeneous in size with an average diameter of 4 nm and an average length of 1177 nm. The CNC had an average diameter of 6 nm and an average particle length of 193 nm. CNF and CNC had good thermal stability and an aspect ratio of 294 and 32, respectively.

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Section: Introductionmentioning

confidence: 99%

Rapeseed Straw Biorefinery Process

Svärd

Moriana

Brännvall

et al. 2018

ACS Sustainable Chem. Eng.

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“…Based on the studies referred above, an extensive modeling work has been recently conducted by Nieminen et al (2014a,b) . To benefit from the increased polysaccharide retention at elevated alkalinity in kraft cooking, dissolved hemicelluloses should be recovered through enhanced readsorption onto the fibers ( Yllner and Enstr ö m 1956 ;Aurell 1965 ;Meller 1968 ;Ribe et al 2010 ) or through separate isolation purification methods by membrane separation ( Arkell et al 2014 ;Testova et al 2014 ) followed by precipitation ( Liu et al 2011 ).…”

Section: Introductionmentioning

confidence: 99%

Stabilization, degradation, and dissolution behavior of Scots pine polysaccharides during polysulfide (K-PS) and polysulfide anthraquinone (K-PSAQ) pulping

et al. 2015

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The behavior of Scots pine (Pinus sylvestris L.) polysaccharides was studied during modified kraft pulping processes of wood meal by polysulfide (K-PS) and polysulfide anthraquinone (K-PSAQ) at the hydroxide ion concentrations of 0.50 and 1.55 M [OH -] with a high liquorto-wood (L/W) ratio of 200. The high L/W ratio was selected for avoiding diffusion phenomena and to be able to focus on the chemistry of polysaccharides. A comparison with the kraft process reference at 160 ° C revealed a substantial increase in pulp yield (6 -7% in K-PS pulping and 7.5 -10.5% in K-PSAQ pulping) mainly attributed to galactoglucomannan (GGM) stabilization. Due to the rapid delignification rate at 1.55 M [OH -] concentration, the temperature could be lowered from 160 ° C to 130 ° C without a notable prolongation of cooking time. In K-PS pulping at 130 ° C, no additional GGM stability was observed compared to 160 ° C, whereas cellulose and arabinoxylan preservation was improved. In K-PSAQ pulping, GGM preservation was also significantly improved. At 130 ° C, pulp yield increase of approximately 8% in PS pulping and more than 11% in PSAQ pulping was observed. The amount of dissolved softwood hemicelluloses in black liquor was significantly increased at the higher [OH -] level and even further in the presence of PS and AQ. Simultaneously, the formation of hydroxy acids was decreased, indicating a significant stabilization of the dissolved polysaccharide fraction parallel to the pulp polysaccharides.

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“…For alkali hemicellulose extraction from birch wood, Testova et al [32] reported that a high level of recovering can be obtained since only 2% of the residual sodium hydroxide remained in the concentrated fraction after sequential nano-and diafiltration. Schild et al [33] also reported an efficient separation of xylan from strong alkaline solutions through ultrafiltration in bench-scale experiments.…”

Section: Hemicellulose Extraction and Precipitation Yieldsmentioning

confidence: 99%

Alkali-peroxide treatment of sugar cane bagasse. Effect of chemical charges on the efficiency of xylan isolation and susceptibility of bagasse to saccharification

Solier

Mocchiutti

Cabrera

et al. 2020

Biomass Conv. Bioref.

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Sugar cane is a promising raw material for the extraction of hemicelluloses. An alkali treatment of sugar cane bagasse under proper conditions followed by a precipitation using a reasonable quantity of ethanol can be an effective method to isolate these polysaccharides. In this work, bagasse is treated to obtain two products: (a) polymeric hemicellulose and (b) an enzymatic hydrolysate from the treated bagasse after hemicellulose extraction. The effects of charges of sodium hydroxide (10, 20, 40% w/w) and hydrogen peroxide (0, 10, 20% w/w) in the alkali treatment were evaluated. A 3 2 experimental design was considered under control of metal ions and inert atmosphere during alkaline treatment. An acceptable proportion of xylose plus arabinose could be extracted from bagasse (up to 18.4 g/100 g of bagasse). Both the alkali and peroxide showed strong effects on the yield of the extraction, as well as on the yield of the precipitation in ethanol-water solution. Besides, the susceptibility of bagasse for cellulolytic enzymatic hydrolysis is improved. The highest hemicellulose precipitation yield was 85% which corresponded to the treatment with the highest alkali charge without peroxide. The highest yield of enzymatic hydrolysis was obtained for the highest alkali and peroxide charges.

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Combined Production of Polymeric Birch Xylan and Paper Pulp by Alkaline Pre-extraction Followed by Alkaline Cooking

Cited by 11 publications

References 24 publications

Rapeseed Straw Biorefinery Process

Rapeseed Straw Biorefinery Process

Stabilization, degradation, and dissolution behavior of Scots pine polysaccharides during polysulfide (K-PS) and polysulfide anthraquinone (K-PSAQ) pulping

Alkali-peroxide treatment of sugar cane bagasse. Effect of chemical charges on the efficiency of xylan isolation and susceptibility of bagasse to saccharification

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