Influence of TEMPO-mediated oxidation on the lignin of thermomechanical pulp

Ma, Pu; Fu, Shaoling; Zhai, Huamin; Law, K. N.; Daneault, Claude

doi:10.1016/j.biortech.2012.05.037

Cited by 49 publications

(47 citation statements)

References 11 publications

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“…Previous studies on the chemical modification of lignin containing pulp (thermomechanical pulp, TMP) using TEMPONaBr oxidation system together with 7.5 mmol/g of NaClO resulted in formation of lignocellulosic pulp with a carboxylic acid content of 1.2 mmol/g. 29 The method also led to delignification of the pulp and when using significantly high content of NaClO (13 -26 mmol/g) almost complete delignification occurred (the carboxylic acid of content of the oxidized pulps were between 1 and 1.5 mmol/g). 30 Therefore, the current method is more suitable for producing carboxylated lignocellulose pulp with high carboxylic acid content, yield, and minimal lignin loss.…”

Section: Resultsmentioning

confidence: 99%

Anionic wood nanofibers produced from unbleached mechanical pulp by highly efficient chemical modification

Sirviö

Visanko

2017

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

Anionic wood nanofibers produced from unbleached mechanical pulp by highly efficient chemical modification

Sirviö

Visanko

2017

J. Mater. Chem. A

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“…The 4-AT-mediated oxidation of extracted eucalyptus pulp was carried out as a starting point, by taking previously reported methods (Ma et al 2010(Ma et al , 2012Okita et al 2010;Saito et al 2010). The oxidation adds negative charges to the surface of the fibers which open up their structure and promote swelling and the possibility of isolating LCNF.…”

Section: -Acetamido-tempo (4-at) Mediated Oxidationmentioning

confidence: 99%

Preparation and evaluation of high-lignin content cellulose nanofibrils from eucalyptus pulp

et al. 2018

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High Klason lignin content (23 wt%) cellulose nanofibrils (LCNF) were successfully isolated from eucalyptus pulp through catalyzed chemical oxidation, followed by high-pressure homogenization. LCNFs had a diameter of ca. 13 nm according to AFM evaluation. Dense films were obtained through vacuum filtration (nanopaper) and subjected to different drying methods. When drying under heat and mild vacuum (93°C, 95 kPa) a higher water contact angle, lower roughness and oxygen transmission rate were observed, compared to those drying at room temperature under compression conditions. DSC experiments showed difference in signals associated to T g of LCNF compared to CNF produced from spruce bleached pulp through enzymatic pre-treatment. The LCNF-based nanopaper showed mechanical properties slightly lower than for those made from cellulose nanofibrils, yet with increased hydrophobicity. In summary, the high-lignin content cellulose nanofibrils proved to be a suitable material for the production of low oxygen permeability nanopaper, with chemical composition close to native wood.

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“…These pulps contain much more lignin than kraft pulps and their chemical composition is almost the same as that of woodchips (Ma et al 2012). Apart from cellulose, hemicelluloses and lignin, TMPs contain proteins (Hafren 2007) and fatty acids (Fleet and Breuil 1998).…”

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confidence: 99%

Comparison of digestibility of wood pulps produced by the sulfate and TMP methods and woodchips of various botanical origins and sizes

et al. 2015

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Poplar and pine cellulosic pulps derived by the sulfate process (Kappa numbers of 15.4 and 31.4, respectively) and a poplar thermomechanical pulp (TMP, Kappa number of 124.7) as well as 0.43-0.8 mm woodchips of various botanical origins (poplar, birch, lime, oak, beech, pine, and spruce) and poplar chips of five different average particle sizes, ranging from 1.6-2.0 to\0.43 mm, were digested by a commercial preparation of cellulases and xylanases (NS-22086 from Novozymes). Yields of reducing sugars derived by enzymatic hydrolysis of the poplar and pine pulps that were obtained by the sulfate method achieved 100 and 89 % on a dry weight basis (52.3 and 35.9 % d.w. wood, respectively) while glucose yields reached 79 and 70.7 % d.w. pulp (41.3 and 28.6 % d.w. wood), respectively. Enzymatic hydrolysis of the pine TMP resulted in glucose and reducing sugars yields of only 14.0 and 36.7 % d.w. pulp (around 13 and 34 % d.w. wood, respectively). Yields of glucose and soluble reducing sugars released from the poplar chips were inversely proportional to their size and varied between around 5.3-7.8, and 15.7-22.4 % d.w., respectively. Reducing sugars yields from beech, birch and lime chips were slightly higher than from the poplar chips of the same size while pine, spruce and oak chips were less susceptible to enzymatic digestion. The dominating sugars in the hydrolysates of woodchips were glucose and cellobiose (70-90 % w/w of the sum of 5 detected sugars) while mannose, xylose and arabinose concentrations were relatively low.

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Influence of TEMPO-mediated oxidation on the lignin of thermomechanical pulp

Cited by 49 publications

References 11 publications

Anionic wood nanofibers produced from unbleached mechanical pulp by highly efficient chemical modification

Anionic wood nanofibers produced from unbleached mechanical pulp by highly efficient chemical modification

Preparation and evaluation of high-lignin content cellulose nanofibrils from eucalyptus pulp

Comparison of digestibility of wood pulps produced by the sulfate and TMP methods and woodchips of various botanical origins and sizes

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