Effect of pulping conditions on lignin structure from maritime pine kraft pulps

Baptista, Cecília; Robert, D.; Duarte, Ana Paula

doi:10.1016/j.cej.2006.05.002

Cited by 39 publications

(20 citation statements)

References 13 publications

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“…The condensation of lignin is accompanied by an increase in molecular weight, which results in precipitation during the process and subsequently lignin is recovered in the regenerated material. Moreover, inhibition of lignin dissolution after condensation is another issue that contribute to the higher percentage of lignin recovered in the regenerated material [81,82]. Nevertheless, if higher temperatures were complemented with long dissolution times, the condensed lignin could start to decompose and subsequently dissolve [83].…”

Section: Temperature Effectmentioning

confidence: 99%

Ionic liquids as a tool for lignocellulosic biomass fractionation

Lopes

João

Morais

et al. 2013

sustain chem process

198

124

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Lignocellulosic biomass composes a diversity of feedstock raw materials representing an abundant and renewable carbon source. In majority lignocellulose is constituted by carbohydrate macromolecules, namely cellulose and hemicellulose, and by lignin, a polyphenilpropanoid macromolecule. Between these biomacromolecules, there are several covalent and non-covalent interactions defining an intricate, complex and rigid structure of lignocellulose. The deconstruction of the lignocellulosic biomass makes these fractions susceptible for easier transformation to large number of commodities including energy, chemicals and material within the concept of biorefinery. Generally, the biomass pre-treatment depends on the final goal in the biomass processing. The recalcitrance of lignocellulose materials is the main limitation of its processing once the inherent costs are excessively high for the conventional pre-treatments. Furthermore, none of the currently known processes is highly selective and efficient for the satisfactory and versatile use, thus, new methodologies are still studied broadly. The ionic liquid technology on biomass processing is relatively recent and first studies were focused on the lignocellulosic biomass dissolution in different ionic liquids (ILs). The dissolution in IL drives to the structural changes in the regenerated biomass by reduction of cellulose crystallinity and lignin content contrasting to the original biomass. These findings provided ILs as tools to perform biomass pre-treatment and the advantageous use of their specific properties over the conventional pre-treatment processes. This review shows the critical outlook on the study of biomass dissolution and changes occurred in the biomass during this process as well as on the influence of several crucial parameters that govern the dissolution and further pre-treatment process. The review of currently known methods of biomass fractionation in IL and aqueous-IL mixtures is also discussed here and perspectives regarding these topics are given as well.

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Section: Temperature Effectmentioning

confidence: 99%

Ionic liquids as a tool for lignocellulosic biomass fractionation

Lopes

João

Morais

et al. 2013

sustain chem process

198

124

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“…In addition to the advantages presented in Table 1, organosolv pre-treatment has the following benefits: 1) organic solvents are easily recovered by distillation and can be recycled back to the pre-treatment process; 2) after pre-treatment, the recovered lignin can be used for various coproducts (vanillic acid, vanillin and p-coumaryl); and 3) pre-treatment contemplates the use of all components of the biomass, making it viable for biorefinery of lignocellulosic biomass. The ethanosolv process is currently one of the best pre-treatments of biomass residues from an environmental perspective [14][15][16][17][18][19][20][21].…”

Section: Materials Of Cellulosic Origin: Pre-treatment and New Treatmmentioning

confidence: 99%

Biopolymers from Waste Biomass — Extraction, Modification and Ulterior Uses

Ballinas-Casarrubias¹,

Camacho‐Dávila²,

NestorGutierrez-Méndez³

et al. 2016

Recent Advances in Biopolymers

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The residues coming from woodlands and agricultural exploitation constitute the most abundant biomass available on earth. Its importance as a source of renewable energy has grown in addition to the environmental impact. Biomass waste is a lignocellulosic feedstock which contains three main biopolymers cellulose, hemicellulose and lignin. It could be utilized for the production of a number of value-added products due to their chemical composition, but it is necessary to efficiently recover the valuable biopolymer as intact as possible by different processing techniques.For different applications, the principal objective of pre-treatment is to keep the cellulose intact, meanwhile hemicellulose and lignin are removed. The yields of the fractions depend on the pre-treatment method, which is the most expensive step in biomass conversion. Traditionally, cellulose is obtained by kraft, sulphite and soda treatments. These methods are non-environmentally friendly and generate huge quantities of toxic wastes. Recently developed models considering the environmental laws encourage the sustainable processing of biomass into value-added products. The use of ionic liquids as new solvents for biomass waste and organosolv processes is reviewed, which are used to obtain cellulose. One of the possible applications of cellulose is membrane synthesis, which has been reported for other biomass materials, such as sugarcane bagasse, mango seed and newspaper. In this chapter, some green pre-treatment methods, different sustainable routes for cellulose modification and some of the results obtained on membrane development based on waste biomass are discussed.

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“…In these processes (as in many other cases), the chemical structure of wastewater is scarcely established, which makes the design of an effluent treatment system very difficult. Since this effluent is recalcitrant to biological degradation and it might be toxic to aquatic species , conventional treatment systems are not enough and pulp and paper mills are forced to adopt technologically advanced treatments .…”

Section: Introductionmentioning

confidence: 99%

Removal of Recalcitrant Organic Compounds From an Industrial Complex Effluent by Heterogeneous Fenton‐Type Treatment

Covinich

Felissia

Fenoglio

et al. 2017

CLEAN Soil Air Water

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Because of their chemical complexity, industrial chemi-mechanical pulping effluents are evaporated and burned, in spite of the high associated cost involved in these processes. The aim of this study was to remove recalcitrant compounds from this kind of wastewater using a Fenton-type treatment. The main parameters involved in the process and their influence on the results were determined. Homemade catalysts based on CuO, Fe 2 O 3 , NiO, and ZnO, supported on g-Al 2 O 3 have been tested for catalytic oxidation, and the CuO/g-Al 2 O 3 catalysts showed the greatest effect on total organic carbon (TOC) reduction (52.7%). A series of two-level factorial experiments was subsequently applied to evaluate the most favorable range of conditions for CuO/g-Al 2 O 3 application. The studied variables were hydrogen peroxide concentration ([H 2 O 2 ], g/L), active phase content (metal oxide supported on alumina,%), mass of catalyst (metal oxide/alumina system, g), and reaction temperature (°C). The highest reduction of all parameters was obtained at the superior level of all variables with CuO/g-Al 2 O 3 , achieving reductions of chemical oxygen demand (COD) and TOC between 40 and 50%. Increasing catalyst mass did not produce additional benefit. This variable has a significant effect only on the reduction of aromatic compounds. At its low level, reduction in aromatic content exceeded 80%. Color reduction was influenced only by temperature (maximum reduction of 90%).

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Effect of pulping conditions on lignin structure from maritime pine kraft pulps

Cited by 39 publications

References 13 publications

Ionic liquids as a tool for lignocellulosic biomass fractionation

Ionic liquids as a tool for lignocellulosic biomass fractionation

Biopolymers from Waste Biomass — Extraction, Modification and Ulterior Uses

Removal of Recalcitrant Organic Compounds From an Industrial Complex Effluent by Heterogeneous Fenton‐Type Treatment

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