Liquefaction o Kraft Lignin at Atmospheric Pressure

Silva, Silvia Helena Fuentes da; Santos, Patrícia Soares Bilhalva dos; Gatto, Darci Alberto; Angeles, Maria; Res,; Egs, Itziar

doi:10.32604/jrm.2019.04291

Cited by 5 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The raw lignocellulosic material used in this work was pinewood sawdust and its lignin content was initially estimated to be 27.36% ± 7.93, which is in agreement with the literature [1,33,34].…”

Section: Optimization Of the Lignin Extraction Conditionssupporting

confidence: 85%

Lignin Extraction from Waste Pine Sawdust Using a Biomass Derived Binary Solvent System

Magalhães

Filipe

Melro

et al. 2021

Preprint

View full text Add to dashboard Cite

Lignocellulosic biomass fractionation is typically performed using methods that are somehow harsh to the environment, such as in the case of the kraft pulping. In recent years, the development of new sustainable and environmentally friendly alternatives has grown significantly. Among the developed systems, bio-based solvents emerge as promising alternatives for biomass processing. Therefore, in the present work, the bio-based and renewable chemicals, levulinic acid (LA) and formic acid (FA), were combined to fractionate lignocellulosic waste (i.e., Maritime pine sawdust) and isolate lignin. Different parameters, such as LA/FA ratio, temperature, and extraction time, were optimized to boost the yield and purity of extracted lignin. The LA/FA ratio was found to be crucial regarding the superior lignin extraction from the waste biomass. Moreover, the increase in temperature and extraction time enhances the amount of extracted residue but compromises the lignin purity and reduces its molecular weight. The electron microscopy images revealed that biomass samples suffer significant structural and morphological changes, which further suggests the suitability of the new developed bio-fractionation process. Same was concluded by the FTIR analysis, in which no remaining lignin was detected in the cellulose-rich fraction. Overall, the novel combination of bio-sourced FA and LA has shown to be a very promising system for lignin extraction of high purity from biomass waste, thus contributing to extend the opportunities of lignin manipulation and valorisation into novel added-value biomaterials.

show abstract

Section: Optimization Of the Lignin Extraction Conditionssupporting

confidence: 85%

Lignin Extraction from Waste Pine Sawdust Using a Biomass Derived Binary Solvent System

Magalhães

Filipe

Melro

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…12 s to ca. 26 s, for untreated and treated samples, respectively [99]. The flame and ember times increased, whereas the weight loss decreased from ca.…”

Section: Potential Of Lignin and Chitosan In Cellulose-based Fr Coatingsmentioning

confidence: 94%

Progress in Achieving Fire-Retarding Cellulose-Derived Nano/Micromaterial-Based Thin Films/Coatings and Aerogels: A Review

Turku,

Rohumaa,

Tirri

et al. 2023

Preprint

View full text Add to dashboard Cite

The enormous potential of renewable bioresources is expected to play a key role in the development of the EU’s sustainable circular economy. In this context, inexhaustible, biodegradable, non-toxic and carbon-neutral forest-origin resources are very attractive for the development of novel sustainable products. The main structural component of wood is cellulose, which, in turn, is the feedstock of nanocellulose, one of the most explored nanomaterials. Different applications of nanocellulose have been proposed, including packaging, functional coatings, insulating materials, nanocomposite fields among others. However, the intrinsic flammability of nanocellulose restricts its use in some industries where fire risk is a concern. This paper overviews the most recent studies of the fire resistance of nanocellulose-based materials, focusing on thin films, coatings and aerogels. Along with effectiveness, increased attention to sustainable approaches is considered in developing novel fire-resistant coatings. The great potential of bio-based fire-resistant materials, combined with conventional non-halogenated fire retardants FRs, has been established. The formulation methods, types of fire retardants and their action modes, and methods used for analysing fire retardancy are discussed in the frame of this overview.

show abstract

“…Among the available biomasses, lignin is the second-most abundant [1]. Lignin has a large, complex, and amorphous structure consisting of three central units: coniferyl, p-coumaryl, and sinapyl alcohols [2][3][4]. This structure is composed of smaller parts connected by ethers or carbon-carbon bonds and high-value substances such as vanillin [5].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Vanillin Production from Lignin Using Catalytic Depolymerization over a CuO/Al2O3Catalyst

Sangnak

Neramittagapong

et al. 2023

App. Envi. Res.

View full text Add to dashboard Cite

The optimal conditions for vanillin production from lignin depolymerization using CuO/Al2O3 catalysts were determined by combining Box-Behnken design (BBD) and response surface methodology (RSM). Independent variables, including temperature (80–140 °C), NaOH loading (0.5–1.5 g), time (30–90 min), and catalyst weight (0.5–1.5 g), were investigated to determine the optimal conditions, with the concentration of vanillin being the dependent variable. A CuO/Al2O3 catalyst was prepared by impregnation method. The vanillin obtained from the reaction was analyzed using high-performance liquid chromatography (HPLC). The maximum obtained vanillin concentration of 59.14 mg·L-1 was achieved with a temperature of 80 °C, a reaction time of 90 min, NaOH loading of 1.5 g, and 1.5 g of catalyst. The amount of NaOH was the most influential factor governing the obtained vanillin concentration. Regression analysis was performed to determine the formula describing the vanillin concentration in terms of the independent variables with a reasonable degree of accuracy (R2 = 0.87). This study shows that the optimal conditions for the depolymerization of lignin to vanillin over a CuO/Al2O3 catalyst can be achieved under milder conditions than those reported previously.

show abstract

Liquefaction o Kraft Lignin at Atmospheric Pressure

Cited by 5 publications

References 15 publications

Lignin Extraction from Waste Pine Sawdust Using a Biomass Derived Binary Solvent System

Lignin Extraction from Waste Pine Sawdust Using a Biomass Derived Binary Solvent System

Progress in Achieving Fire-Retarding Cellulose-Derived Nano/Micromaterial-Based Thin Films/Coatings and Aerogels: A Review

Optimization of Vanillin Production from Lignin Using Catalytic Depolymerization over a CuO/Al2O3Catalyst

Contact Info

Product

Resources

About