Kinetics of organosolv delignification of fibre crop Arundo donax L

Shatalov, Anatoly A.; Pereira, Helena

doi:10.1016/j.indcrop.2004.04.010

Cited by 59 publications

(40 citation statements)

References 13 publications

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“…This activation energy is within the range 64 -96 kJ/mol found correspondingly for the initial, bulk and residual lignin fractions (Shatalov and Pereira 2005). This value is in line with the range of 40 -80 kJ/mol reported for wood kraft delignification (Santos et al 1997) and of 66 -78 kJ/mol reported for acetic acid pulping of E. globulus (Va´zquez et al 1995).…”

Section: Model Parameters For the Delignification Kineticssupporting

confidence: 89%

“…Pulping experiments of giant reed were carried out in batchwise operations (Shatalov and Pereira 2005). The cooks were performed under the same ethanol-alkali mixture concentration with a high liquor-to-wood ratio of 6:1.…”

Section: Pulping Conditionsmentioning

confidence: 99%

“…It is anticipated that this model can also characterise the delignification kinetics of other lignocellulosic materials because the heterogeneous nature of the relevant reactions are similar. In this study this Nuclei Growth model will be tested against published data which were obtained from alkaline delignification of thin hemp woody core in isothermal flow-through reactors (De Groot et al 1995), ethanol-alkali organosolv delignification of fibre crop giant reed (Shatalov and Pereira 2005), acid-catalysed organosolv fractionation of wheat straw (Siridas and Koukios 2004), organosolv delignification of cottonwood in batch and flowthrough reactors (Tirtowidjojo et al 1988), kraft delignification of bamboo (Vu et al 2004) and alkaline delignification of flax fibres (Petrova et al 2004). We will attempt to identify the model parameters taking into account the effects of the type of lignocellulosic material and pulping processes.…”

Section: Introductionmentioning

confidence: 99%

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A universal kinetic equation for characterising the fractal nature of delignification of lignocellulosic materials

Dang

Nguyen

2006

Cellulose

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A kinetic model was developed, based on the power law of growth and Avrami's nuclei growth concepts, to describe the heterogeneous nature of pulping kinetics, taking into account the effects of chemical concentration and temperature. The general form of the kinetic equation is first order with a timedependent rate coefficient. The model was statistically tested using published data obtained from delignification of lignocellulosic materials (hemp woody core, giant reed, wheat straw, cottonwood, bamboo and flax fibres). The activation energies of the delignification range from 71 to 136 kJ/mol. The p-values obtained from the regression analysis are significantly small indicating that all the estimates of the model parameters were significant with very high levels of confidence. The correlation coefficients R 2 for these models range from 0.76 to 0.98.

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Section: Model Parameters For the Delignification Kineticssupporting

confidence: 89%

Section: Pulping Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A universal kinetic equation for characterising the fractal nature of delignification of lignocellulosic materials

Dang

Nguyen

2006

Cellulose

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“…The lignin content in the whole stalk is 21.1% [139] with 16-22% in the internodes and 15-20% in nodes [140]. The lignin is of HGS-type mainly constituted by guaiacyl and syringyl units with some p-hydroxyphenyl units [141].…”

Section: Arundo Donaxmentioning

confidence: 99%

Compositional Variability of Lignin in Biomass

Lourenço¹,

Pereira²

2018

Lignin - Trends and Applications

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The objective of this chapter is to provide a concise overview of lignin composition and structure in different species and materials (wood, barks and nonwood plants). It includes a brief review on the lignin precursors and their polymerization as well as of the analytical tools used for lignin characterization from wet chemical to spectroscopic methods. Wood of gymnosperms is characterized by high lignin content (25-35%) and a HG-type of lignin with more guaiacyl (G) units and a small portion of p-hydroxyphenyl (H) units. Wood of angiosperms has a lignin content of 15-28%, with a GS-lignin having different proportions of syringyl (S) units. Nonwoody monocotyledon species have different lignin content (9-20%) and a HGS type of lignin, characterized by a high proportion of H units. Bark lignin content ranges from 13 to 43% and is of HGS-type with species-specific composition and different in the bark components, phloem and cork. Lignin composition and macromolecular structure are key issues to understand the properties of lignocellulosic materials and to design a lignin-based pathway within biomass biorefineries. The available information on lignin composition is still limited to a few species and plant components. This is certainly an area where more research is needed.

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“…Besides this, in the last decade, a great attention of the European agricultural research was focused on the search of new non-food and high-yield short-rotations crops with perspective for industrial utilisation [3]. Thus, fast-growing high-yield fiber farms offer enormous potential to provide a productive new resource for the pulp and fiber manufacturing sector [4].…”

Section: Introductionmentioning

confidence: 99%

Cellulosic pulp from Leucaena diversifolia by soda–ethanol pulping process

López¹,

Pérez²,

García³

et al. 2011

Chemical Engineering Journal

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A selection of the best wood raw materials for cellulose pulp and papermaking from five varieties of the Leucaena has been made (Leucaena diversifolia, Leucaena colinsii and three varieties of Leucaena leucocepha) with growth periods of one, two and three years. In accordance with biomass production and the features of the raw materials and cellulose pulp obtained, Leucaena diversifolia in its second year of growth was selected as the most suitable material for pulp and papermaking. Pulping of L. diversifolia by soda-ethanol was studied using an experimental design in order to investigate the effects of cooking variables: temperature, time, soda concentration, ethanol concentration and washdisintegrate temperature on the chemical composition of the obtained pulps (yield, kappa number, viscosity, solubles substances, lignin, holocellulose and α-cellulose contents) and the physico-chemical characteristics of paper sheets (tensile index). The results were evaluated using the response surface methodology. The optimum pulping conditions were established for this lignocellulosic material, using the model predictions. The pulp obtained at these conditions has suitable chemical (pulp) and physical (paper sheets) characteristics: yield (46.5%), 1%NaOH solubles (3.04%), hot water solubles (0.63%), ethanol-benzene extractives (0.44%), holocellulose contents (96.7%), α-cellulose contents (75.8%), lignin contents (0.85%), viscosity (1367) kappa number (15.2) and tensile index (19.2 kN m/kg).

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Kinetics of organosolv delignification of fibre crop Arundo donax L

Cited by 59 publications

References 13 publications

A universal kinetic equation for characterising the fractal nature of delignification of lignocellulosic materials

A universal kinetic equation for characterising the fractal nature of delignification of lignocellulosic materials

Compositional Variability of Lignin in Biomass

Cellulosic pulp from Leucaena diversifolia by soda–ethanol pulping process

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