Thermal and thermomechanical analyses of lignin

Moustaqim, Mehdi El; Kaihal, Abderrahmane El; Marouani, Maryam El; Men-La-Yakhaf, Samir; Taïbi, M.; Sebbahi, Saloua; Hajjaji, Souad El; Kifani‐Sahban, Fatima

doi:10.1016/j.scp.2018.06.002

Cited by 78 publications

(33 citation statements)

References 23 publications

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“…The weight loss in lignin did not exceed 2.7% up to 214 • C, whereas in lignin + PVP it did not exceed 3.9% up to 192 • C (see DGT curve, solid lines). These results are very similar to the data provided by Moustaqim et al (2018) [35] in their latest study on thermal analyses of lignin.…”

Section: Thermal Analysissupporting

confidence: 90%

“…Reference publications confirm the fact that PVP is significant for the thermal stabilisation of other materials, including platinum nanoparticles [36]. Moustaqim et al (2018) [35] also found differences in the thermomechanical behaviour of lignin and noted that they may have been caused by internal frictions characteristic of the thermally stressed material.…”

Section: Thermal Analysismentioning

confidence: 86%

“…According to available sources of information [35], the main exothermal degradation stage takes place within 250-570 • C. This stage is divided into three substages associated with the release of various volatile compounds: Phenolic compounds with an aromatic ring, hydroxyl and alkyl groups (~270 • C), and the release of methanol and methane (starting at about 380 • C and 530 • C, respectively).…”

Section: Thermal Analysismentioning

confidence: 99%

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Kraft Lignin Grafted with Polyvinylpyrrolidone as a Novel Microbial Carrier in Biogas Production

2018

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The objective of this study was to verify the effect of kraft lignin as a microbial carrier on biogas/methane yield. An anaerobic co-digestion test process was carried out, in which confectionery waste was used with sewage sludge. At the first stage of the study pure lignin and lignin combined with polyvinylpyrrolidone (PVP) were subjected to an extensive physicochemical analysis. Their morphology, dispersion and adsorption properties were determined. The two materials were also subjected to thermal, spectroscopic and elementary analysis. The anaerobic digestion of the two substrates was carried out with and without the addition of the carrier, under mesophilic conditions and in periodic operation. The monitoring and analysis of the two essential parameters, i.e., pH and volatile fatty acids/total alkalinity (VFA/TA) ratio, revealed that the process was stable in both tests. Microbial and biochemical analyses showed intensified proliferation of eubacteria and increased dehydrogenase activity in samples prepared with the lignin + PVP material. The cell count increased by 46% in the stuffed wafers (WAF) + sewage sludge (SS) variant with the carrier, whereas the enzyme activity increased by 43%. Cell immobilisation noticeably improved the process efficiency. The biogas production increased from 722 m3 Mg−1 VS to 850 m3 Mg−1 VS (VS – volatile solids), whereas the methane production increased from 428 m3 Mg−1 VS to 503 m3 Mg−1 VS (by about 18%). The research proved that lignin could be used as a very effective microbial carrier in anaerobic digestion (AD).

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Section: Thermal Analysissupporting

confidence: 90%

Section: Thermal Analysismentioning

confidence: 86%

Section: Thermal Analysismentioning

confidence: 99%

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Kraft Lignin Grafted with Polyvinylpyrrolidone as a Novel Microbial Carrier in Biogas Production

2018

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“…More crystalline structures of cellulose are decomposing at higher temperature, on a range comprised roughly between 300 • C and 400 • C (Yang et al, 2007). Degradation of lignin occurs on a wide temperature range, between 250 • C and 600 • C. Low temperature degradation (up to 300 • C) is reported as the cleavage of β-O-4 bonds while more stable bonds, namely C-C and β-β, are cleaved from 500 to 600 • C (Moustaqim et al, 2018). A small degradation beyond this point is likely to be attributed to condensed lignin.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Single and Mixed Feedstocks Biorefining: Comparison of Primary Metabolites Recovery and Lignin Recombination During an Alkaline Process

et al. 2020

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Cannabis sp. and Euphorbia sp. are potential candidates as indoor culture for the extraction of their high value-added metabolites for pharmaceutical applications. Both residual lignocellulosic materials recovered after extraction are studied in the present article as single or mixed feedstocks for a closed-loop bioprocesses cascade. An alkaline process (NaOH 3%, 30 min 160 • C) is performed to separate the studied biomasses into their main components: lignin and cellulose. Results highlight the advantages of the multi-feedstocks approach over the single biomass in term of lignin yield and purity. Since the structural characteristics of lignin affect the potential applications, a particular attention is drawn on the comprehension of lignin structure alteration and the possible interaction between them during single or mixed feedstocks treatment. FTIR and 2D-NMR spectra revealed similar profiles in term of chemical functions and structure rather than novel chemical bonds formation inexistent in the original biomasses. In addition, thermal properties and molecular mass distribution are conserved whether hemp or euphorbia are single treated or in combination. A second treatment was applied to investigate the effect of prolonged treatment on extracted lignins and the possible interactions. Aggregation, resulting in higher molecular mass, is observed whatever the feedstocks combination. However, mixing biomass does not affect chemical structures of the end product. Therefore, our paper suggests the possibility of gathering lignocellulosic residues during alkali process for lignin extraction and valorization, allowing to forecast lignin structure and make assumptions regarding potential valorization pathway.

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“…A lignina do bagaço de cana-de-açúcar extraída através do método acetossolve apresentou características de um material com maior pureza quando comparado aos dados encontrados na literatura para outras investigações a partir de lignina extraídas através do método Kraft. 52,53 Portanto, era esperado que não ocorresse uma perda de massa acentuada nessa faixa de temperatura, conforme observado por Martín-Sampedro et al, em diferentes trabalhos de avaliação do comportamento térmico de ligninas organossolve extraídas de Robinia pseudoacacia L. e Populus alba L. 28,32 Houve uma pequena perda de massa no patamar de 290°C a 330°C de aproximadamente 3,5% que pode ser atribuído à degradação da lignina na quebra das ligações β-O-4, conforme apresentado por Kim 54 no estudo da degradação térmica da lignina obtida da madeira de álamo (Populus albaglandulosa).…”

Section: Análise Termogravimétricaunclassified

Isolation and Characterization of Acetosolv Lignin Present in Sugarcane Bagasse

Rodrigues¹,

Carmo²,

Freitas³

et al. 2020

Rev. Virtual Quim.

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The lignin present in the vegetal tissues of the sugarcane bagasse is an interesting material due to its aromatic characteristics. Particularly in Brazil, studies involving the extraction of lignin from sugarcane bagasse have been widely researched due to the high volume of bagasse generated in our country. Recent studies have shown that after isolation, lignin is a raw material that can be used as a pesticide, solution stabilizer and particularly for the production of phenolic resin partially replacing phenol. The present study aimed to isolate and characterize the lignin present in sugarcane bagasse by the acetosolv pulping method. The sugarcane bagasse was pre-treated to remove organic and hot water-soluble extracts, and then acetic (solvent) and hydrochloric (catalyst) acids and water at the temperature were used. boiling point for the isolation of lignin by the acetossolve process. The obtained lignin was characterized by chemical performance analysis, Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC) and thermogravimetry (TGA). The extraction yield of lignin acetosolv was 19.95 % under total sugarcane bagasse. In the lignin FTIR spectrum the stretch range between 1594 and 1511 cm-1 confirm the preservation of the aromatic structure. GPC analysis demonstrated a low polydispersity of lignin acetosolv. TGA analysis showed no residues above 600°C, indicating high content of organic material, confirming the purity of the extracted sample. It is concluded, therefore, that the acetossolve pulping method for lignin extraction may be an efficient alternative, in view of the processes traditionally employed if fibers, not wood (sugarcane bagasse) are used. The fact that it is a process that does not use pressure combined with the possibility of recovering inputs by simple evaporation, makes the acetosolv competitive and with less environmental damage than other traditional processes. A lignina presente nos tecidos vegetais do bagaço da cana é um material interessante devido às suas características aromáticas. Particularmente no Brasil, estudos envolvendo a extração de lignina do bagaço de cana têm sido amplamente pesquisados devido ao alto volume de bagaço gerado em nosso país. Estudos recentes demonstraram que, após o isolamento, a lignina é uma matéria-prima que pode ser usada como pesticida, estabilizador de solução e particularmente para a produção de resina fenólica, substituindo parcialmente o fenol. O presente estudo teve como objetivo isolar e caracterizar a lignina presente no bagaço de cana-de-açúcar pelo método de polpação acetossolve. O bagaço de cana-de-açúcar foi submetido a um pré-tratamento para a remoção de extrativos orgânicos e extrativos solúveis em água quente, e posteriormente, utilizaram-se os ácidos acético (solvente) e clorídrico (catalisador), e água na temperatura de ebulição, para o isolamento da lignina, pelo processo acetossolve. A lignina obtida foi caracterizada por análise química de rendimento, espectroscopia na região do infravermelho com transforma...

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Thermal and thermomechanical analyses of lignin

Cited by 78 publications

References 23 publications

Kraft Lignin Grafted with Polyvinylpyrrolidone as a Novel Microbial Carrier in Biogas Production

Kraft Lignin Grafted with Polyvinylpyrrolidone as a Novel Microbial Carrier in Biogas Production

Single and Mixed Feedstocks Biorefining: Comparison of Primary Metabolites Recovery and Lignin Recombination During an Alkaline Process

Isolation and Characterization of Acetosolv Lignin Present in Sugarcane Bagasse

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