Sulphite Pulping

Evtuguin, Dmitry V.

doi:10.1002/9781118773727.ch8

Cited by 18 publications

(36 citation statements)

References 23 publications

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“…The reason for such disparity of the sensing properties can be attributed to the difference in chemical structure and composition between lignins obtained from different cooking processes, i.e., kraft lignin and LS, or isolation procedures, such as conventional kraft and LignoBoost ® kraft, and LS used previously and in this study [ 5 , 62 ]. LS contains phenolic groups with lower pKa than those in kraft lignin due to the strong electron-withdrawing moieties on the side chain (sulphonic groups at the benzylic carbon and conjugated double bonds) [ 63 ]. In addition to the sulphonic groups, the LS structures with phenolic hydroxyls have a high capacity for chelation of metal cations, thus acting as ionophores.…”

Section: Resultsmentioning

confidence: 99%

Lignosulfonate-Based Conducting Flexible Polymeric Membranes for Liquid Sensing Applications

et al. 2021

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In this study, lignosulfonate (LS) from the acid sulfite pulping of eucalypt wood was used to synthesize LS-based polyurethanes (PUs) doped with multiwalled carbon nanotubes (MWCNTs) within the range of 0.1–1.4% w/w, yielding a unique conducting copolymer composite, which was employed as a sensitive material for all-solid-state potentiometric chemical sensors. LS-based PUs doped with 1.0% w/w MWCNTs exhibited relevant electrical conductivity suitable for sensor applications. The LS-based potentiometric sensor displayed a near-Nernstian or super-Nernstian response to a wide range of transition metals, including Cu(II), Zn(II), Cd(II), Cr(III), Cr(VI), Hg(II), and Ag(I) at pH 7 and Cr(VI) at pH 2. It also exhibited a redox response to the Fe(II)/(III) redox pair at pH 2. Unlike other lignin-based potentiometric sensors in similar composite materials, this LS-based flexible polymeric membrane did not show irreversible complexation with Hg(II). Only a weak response toward ionic liquids, [C2mim]Cl and ChCl, was registered. Unlike LS-based composites comprising MWCNTs, those doped with graphene oxide (GO), reduced GO (rGO), and graphite (Gr) did not reveal the same electrical conductivity, even with loads up to 10% (w/w), in the polymer composite. This fact is associated, at least partially, with the different filler dispersion abilities within the polymeric matrix.

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Section: Resultsmentioning

confidence: 99%

Lignosulfonate-Based Conducting Flexible Polymeric Membranes for Liquid Sensing Applications

et al. 2021

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“…These extractives are known to interfere with the lignin during the sulphite pulping process [56]. There are different sulphite pulping processes namely acid sulphite pulping,bisulfite pulping, neutral sulphite pulping, alkaline sulphite pulping, multistage sulphite pulping, and anthraquinonecatalyzed sulphite pulping [60].…”

Section: Sulphite Pulpingmentioning

confidence: 99%

Agricultural Residues as an Alternative Source of Fibre for the Production of Paper in Kenya-A Review

Otieno

Okumu

Adalla

et al. 2021

AJOCS

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The pulp and paper industry is primarily dependent on fibrous wood for pulp and paper production. However, this over-dependence on fibrous wood poses serious environmental challenges such as the diminishing of the fibrous wood stocks, deforestation, emission of greenhouse gases, and global warming. Therefore, to mitigate these environmental challenges associated with its utilization for paper and pulp production, other sustainable raw material sources can also be considered for the production of paper and pulp. There are enormous benefits associated with the utilization of non-wood fibres as an alternative and sustainable raw materials source for the production of paper and pulp. These benefits have in the recent past prompted millers in China, India, Brazil, and the USA to consider the utilization of non-wood fibres in paper and pulp production. In Kenya, the pulp and paper industry is very much dependent on fibrous wood for production and the industry is yet to fully embrace the utilization of nonwood fibres for paper and pulp production. Further, the dependence on fibrous wood has contributed significantly to the decline of paper pulp and paper production, deforestation, and rise in paper importations due to insufficient raw material supplies. The importation of paper and pulp products has further led to the collapse of the paper industry in Kenya. The sector stands a chance of revival and vibrancy through the utilization of the abundant agricultural residues and feedstocks lying in the agricultural fields across the country. Similar experiences elsewhere have proved that the abundance of agricultural waste can be utilized for the production of paper and pulp due to their excellent fibre content for specialty papers, and easy pulpability. The agricultural residues are therefore considered a quintessential alternative and sustainable source of raw materials for the pulp and paper industry. Moreover, their utilization will mitigate environmental impacts such as deforestation, climate change, and pollution .

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“…This process involves the heating of wooden chips in the presence of sulphur dioxide (SO 2 ) and water. Bisulphite ions are generated, which react with the lignin polymer, and through this process, the wood is delignified and lignosulphonates form (Evtuguin 2016 ). Three categories of substrates can be used for the production of SSL: hardwood (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Monosaccharides, i.e. hexose and pentose sugars, are generated through acid hydrolysis of cellulose and hemicellulose, respectively (Evtuguin 2016 ; Pereira et al 2013 ). The monosaccharides are successively converted to aldehydes and aliphatic acids.…”

Section: Introductionmentioning

confidence: 99%

Growth of wood-inhabiting yeasts of the Faroe Islands in the presence of spent sulphite liquor

Rönnander

Wright

2021

Antonie van Leeuwenhoek

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In the microbial community of decaying wood, yeasts are important for the recycling of nutrients. Nevertheless, information on their biodiversity in this niche in the Northern hemisphere is limited. Wood-colonising yeasts encounter identical and similar growth-inhibitory compounds as those in spent sulphite liquor (SSL), an energy-rich, acid hydrolysate and waste product from the paper industry, which may render them well-suited for cultivation in SSL. In the present study, yeasts were isolated from decaying wood on the Faroe Islands and identified based on sequence homology of the ITS and D1/D2 regions. Among the yeasts isolated, Candida argentea, Cystofilobasidium infirmominiatum, Naganishia albidosimilis, Naganishia onofrii, Holtermanniella takashimae and Goffeauzyma gastrica were new to decaying wood in cold and temperate climates. C. argentea and Rhodotorula are rarely-isolated species, with no previous documentation from cold and maritime climates. The isolates were further tested for growth in a medium with increasing concentrations of softwood SSL. Most grew in the presence of 10% SSL. Isolates of Debaryomyces sp., C. argentea and Rhodotorula sp. were the most tolerant. Representatives of Debaryomyces and Rhodotorula have previously been found in decaying wood. In contrast, the least tolerant isolates belonged to species that are rarely reported from decaying wood. The relative importance of individual inhibitors to yeast growth is discussed. To our knowledge, none of the present yeast species have previously been cultivated in SSL medium. Decaying wood can be a useful future source of yeasts for valorisation of various hydrolysates to industrial chemicals and biofuels.

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Sulphite Pulping

Cited by 18 publications

References 23 publications

Lignosulfonate-Based Conducting Flexible Polymeric Membranes for Liquid Sensing Applications

Lignosulfonate-Based Conducting Flexible Polymeric Membranes for Liquid Sensing Applications

Agricultural Residues as an Alternative Source of Fibre for the Production of Paper in Kenya-A Review

Growth of wood-inhabiting yeasts of the Faroe Islands in the presence of spent sulphite liquor

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