Environmentally friendly pulping and bleaching of bagasse

Khristova, P.; Kordsachia, O.; Patt, R.; Karar, I.; Khider, Tarig Osman

doi:10.1016/j.indcrop.2005.05.002

Cited by 83 publications

(48 citation statements)

References 3 publications

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“…Because the shortage of wood materials is also a global problem, some non-wood materials, especially bamboo, have been used due to their advantages of a short growing period and abundant supply (Khristova et al 2006;Kenealy et al 2007;Lei et al 2010). The preparation of bamboo chemical pulp or chemi-mechanical pulp has attracted much recent attention.…”

Section: Introductionmentioning

confidence: 99%

The Effects of NaOH-Urea Aqueous Solution on the Strength and Softness Properties of Bamboo Ligno-cellulosic Fibers

Zhai¹,

Ma²,

Hu³

et al. 2017

BioResources

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APMP (alkaline peroxide mechanical pulp) of bamboo was treated in NaOH-urea aqueous solution to modify the fiber properties. The effects of soaking time, fiber concentration, alkali dosage, freezing temperature, and freezing time were evaluated by single-factor experiments. The optimal conditions were determined as a soaking time of 10 min, a fiber concentration of 15%, an alkali dosage of 6%, a freezing temperature of -7 °C, and a freezing time of 40 min. Compared with the properties of untreated APMP, the tensile index of the treated APMP was increased by 64%, and the burst index was increased by 82%. The bulk was reduced by 15%, and the softness was increased by 18%. There was no obvious variation on the folding strength. According to the instrumental analysis, there were no significant effects on the structure in terms of functional groups, the crystalline region, or the fiber surface morphology; however, the variation on the fiber quality was more significant.

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Section: Introductionmentioning

confidence: 99%

The Effects of NaOH-Urea Aqueous Solution on the Strength and Softness Properties of Bamboo Ligno-cellulosic Fibers

Zhai¹,

Ma²,

Hu³

et al. 2017

BioResources

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“…Hedjazi et al (2008) used OQ(PO) bleaching sequence to delignify and bleach an alkaline sulfite-anthraquinone (ASAQ) bagasse pulp to a brightness of 80% ISO. Totally chlorine-free bleaching with the Q1(OP)Q2P sequence of the unbleached ASAQ bagasse pulps yielded bleached pulps with 76.9% ISO brightness, which is suitable for producing writing and printing grades of paper (Khristova et al 2006). Nie et al (2014) studied the kinetics of AOX formation in chlorine dioxide bleaching of bagasse pulp.…”

Section: Introductionmentioning

confidence: 99%

Clean Bleaching Engineering Practice for Bagasse Pulp: Totally Chlorine-Free and Elemental Chlorine-Free Bleaching Realized with the Same Production Line

et al. 2015

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The experimental research, process design principles, and engineering practice of a bagasse pulp production line that could run both totally chlorine-free (OP)Q(PO) and elemental chlorine-free (OP)D(EOP) bleaching sequences are discussed in this paper. Under specified process conditions, the oxygen delignification rate was up to 50% and the brightness of unbleached pulp increased. The (OP)Q(PO) sequence bleached pulp had a brightness of 83.1% ISO and an intrinsic viscosity of 888 mL/g, and the (OP)D(EOP) sequence bleached pulp had a brightness of 85.7% ISO and an intrinsic viscosity of 905 mL/g. Pulp quality produced from both bleaching sequences was better than pulp bleached by the chlorination, alkaline extraction, and hypochlorite (CEH) sequence. The wastewater was discharged only from the Q or D stage, and the chemical oxygen demand (COD) of Q or D stage was about 650 mg/L or 1100 mg/L, respectively. It was easy to alternate between these two bleaching sequences, and the bleached pulp quality from these sequences was stable.

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“…[64][65][66] Além disso, perácidos têm sido empregados com sucesso em sequências de deslignificação-branqueamento de alto rendimento junto a tratamento alcalino, especialmente com NaOH, KOH ou NH 4 OH. [67][68][69][70] Khristova e colaboradores, 71 empregando sulfito em meio alcalino (NaOH/Na 2 SO 3 ) em uma sequência de deslignificação-branqueamento TCF para a obtenção da polpa celulósica, demonstraram que a qualidade da polpa de celulose, utilizando o método do sulfito, é superior aos métodos que utilizam apenas meio alcalino na deslignificação.…”

Section: Ligninaunclassified

Aplicações de fibras lignocelulósicas na química de polímeros e em compósitos

2009

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Recebido em 19/1/09; aceito em 25/3/09; publicado na web em 2/4/09 APPLICATIONS OF LIGNOCELLULOSIC FIBERS IN POLYMER CHEMISTRY AND IN COMPOSITES. The use of lignocellulosic fibers and their constituents, as raw materials in the production of polymeric and composite materials, represent an exceptional opportunity of sustainable technological development. In the present report works that discuss promising alternatives of obtaining and use of materials such as cellulose, hemicellulose, lignin, cellulose nanocrystals and biocomposites were revised. The advance in the use of biomass can be, in a near future, capable of going beyond the application difficulties of these vast materials, especially in relation to the economical unviability, by the production of high performance polymeric and composite materials. This advance would represent a higher profitability to some areas of agrobusiness, especially the sector of biofuels, which produces elevated amounts of biomass waste.Keywords: lignocellulosic fibers; nanowhiskers; biocomposites. introduçÃoNos últimos anos tem surgido um grande interesse mundial no desenvolvimento de tecnologias "verdes" que possibilitem a utilização de produtos de menor impacto ambiental.1-4 A química "verde", como um todo, implica no desenvolvimento de processos químicos e produtos que levem a um ambiente mais limpo, saudável e sustentável. Neste contexto, os materiais plásticos sintéticos têm recebido especial atenção por conter em seus métodos de preparação questões que devem ser priorizadas. As questões que devem ser priorizadas são a não-biodegradabilidade dos plásticos sintéticos e por serem oriundos de fontes não-renováveis. 5-8Na busca pela sustentabilidade, várias pesquisas e trabalhos na área de materiais poliméricos e compósitos foram, e estão sendo, realizados para garantir a preservação ambiental e proporcionar um melhor padrão de vida à sociedade.9-13 Dentre as pesquisas nesta área, as que buscam a aplicação de recursos naturais na preparação dos materiais vêm crescendo, podendo-se destacar o uso de fibras naturais. [14][15][16][17][18][19][20][21][22] A Organização das Nações Unidas para a Agricultura e a Alimentação (FAO-ONU -Food and Agriculture Organization of the United Nations) declarou o ano de 2009 como o ano internacional das fibras naturais.23 A medida visa conscientizar e estimular a utilização de fibras naturais, encorajando políticas governamentais de incentivo ao setor e às ações empresariais sustentáveis, para a exploração dessas matérias-primas.Destaque ainda maior deve ser dado à utilização de fibras naturais de origem vegetal, em razão da enorme variedade de espécies passí-veis de serem pesquisadas. Diversas fibras vegetais são produzidas em praticamente todos os países e usualmente são designadas como materiais lignocelulósicos. Algumas fibras ocorrem espontaneamente na natureza, outras são cultivadas como atividade agrícola e ainda há aquelas que são resíduos gerados, principalmente, pela agroindústria. Na Tabela 1 pode ser verificada a produção anual das princ...

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Environmentally friendly pulping and bleaching of bagasse

Cited by 83 publications

References 3 publications

The Effects of NaOH-Urea Aqueous Solution on the Strength and Softness Properties of Bamboo Ligno-cellulosic Fibers

The Effects of NaOH-Urea Aqueous Solution on the Strength and Softness Properties of Bamboo Ligno-cellulosic Fibers

Clean Bleaching Engineering Practice for Bagasse Pulp: Totally Chlorine-Free and Elemental Chlorine-Free Bleaching Realized with the Same Production Line

Aplicações de fibras lignocelulósicas na química de polímeros e em compósitos

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