Solvent fractionation of organosolv lignin to improve lignin homogeneity: Structural characterization

Ramakoti, Bharadwaj; Dhanagopal, Harishwar; Deepa, K.; Rajesh, Mathur; Ramaswamy, Shri; Tamilarasan, K.

doi:10.1016/j.biteb.2019.100293

Cited by 30 publications

(21 citation statements)

References 42 publications

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“…The second stage was observed around 100 °C-260 °C, which indicated the decomposition of polysaccharides, aliphatic alcohols, and acids 48 . At pH ranging from 10 to 4, the mass loss was less than 6 wt%, which confirms www.nature.com/scientificreports/ the negligible presence of non-lignin compounds co-precipitating with silica, whereas 10-14% of weight loss was reported from samples recovered at pH 3 to pH 1.…”

Section: Clarification Of Chemical Structure Ft-ir Analysismentioning

confidence: 99%

The novel method to reduce the silica content in lignin recovered from black liquor originating from rice straw

Nghị

Pham

et al. 2020

Sci Rep

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Difficulties in the production of lignin from rice straw because of high silica content in the recovered lignin reduce its recovery yield and applications as bio-fuel and aromatic chemicals. Therefore, the objective of this study is to develop a novel method to reduce the silica content in lignin from rice straw more effectively and selectively. The method is established by monitoring the precipitation behavior as well as the chemical structure of precipitate by single-stage acidification at different pH values of black liquor collected from the alkaline treatment of rice straw. The result illustrates the significant influence of pH on the physical and chemical properties of the precipitate and the supernatant. The simple two-step acidification of the black liquor at pilot-scale by sulfuric acid 20w/v% is applied to recover lignin at pH 9 and pH 3 and gives a percentage of silica removal as high as 94.38%. Following the developed process, the high-quality lignin could be produced from abundant rice straw at the industrial-scale.

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Section: Clarification Of Chemical Structure Ft-ir Analysismentioning

confidence: 99%

The novel method to reduce the silica content in lignin recovered from black liquor originating from rice straw

Nghị

Pham

et al. 2020

Sci Rep

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“…Solvent extraction is a widely adopted strategy to isolate technical lignin fractions with controlled properties [34][35][36][37]. This approach is typically implemented with the treatment of raw lignin using a sequence of different solvents with increasing solubilization capability in order to obtain selected fractions with defined characteristics.…”

Section: Introductionmentioning

confidence: 99%

Tuning Lignin Characteristics by Fractionation: A Versatile Approach Based on Solvent Extraction and Membrane-Assisted Ultrafiltration

et al. 2020

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Technical lignins, typically obtained from the biorefining of lignocellulosic raw materials, represent a highly abundant natural aromatic feedstock with high potential in a sustainable economy scenario, especially considering the huge primary production volumes and the inherently renewable nature of this resource. One of the main drawbacks in their full exploitation is their high variability and heterogeneity in terms of chemical composition and molecular weight distribution. Within this context, the availability of effective and robust fractionation processes represents a key requirement for the effective valorization of lignin. In the present work, a multistep fractionation of two different well known technical lignins obtained from two distinct delignification processes (soda vs. kraft pulping) was described. A comprehensive approach combining solvent extraction in organic or aqueous medium with membrane-assisted ultrafiltration was developed in order to maximize the process versatility. The obtained lignin fractions were thoroughly characterized in terms of their chemical, physical, thermal, and structural properties, highlighting the ability of the proposed approach to deliver consistent and reproducible fractions of well-controlled and predictable characteristics, irrespective of their biomass origin. The results of this study demonstrate the versatility and the reliability of this integrated multistep fractionation method, which can be easily adapted to different solvent media using the same ultrafiltration membrane set up, thereby enhancing the potential applicability of this approach in an industrial scale-up perspective for a large variety of starting raw lignins.

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“…Additionally, lignin from mangosteen peel, which was extracted using the organosolv process at a higher temperature of 150 °C, is labeled as LMPT. For the spectra evaluation, several publications studying FTIR characterization of lignin were used [ 22 , 23 , 24 , 25 ]. At a wavelength of 1600 cm −1 , lignin in (a), (b), (c), and (d) showed C=C stretching of the aromatic ring in lignin while in 1510 cm −1 (c) and (d) showed the aromatic skeleton vibrations.…”

Section: Resultsmentioning

confidence: 99%

Lignin Refinery Using Organosolv Process for Nanoporous Carbon Synthesis

et al. 2020

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Porous carbon has been widely used for many applications e.g., adsorbents, catalysts, catalyst supports, energy storage and gas storage due to its outstanding properties. In this paper, characteristics of porous carbon prepared by carbonization of lignin from various biomasses are presented. Various biomasses, i.e., mangosteen peel, corncob and coconut shell, were processed using ethanol as an organosolv solvent. The obtained lignin was characterized using a Fourier transform infrared (FTIR) spectrophotometer and a viscosimeter to investigate the success of extraction and lignin properties. The results showed that high temperature is favorable for the extraction of lignin using the organosolv process. The FTIR spectra show the success of lignin extraction using the organosolv process because of its similarity to the standard lignin spectra. The carbonization process of lignin was performed at 600 and 850 °C to produce carbon from lignin, as well as to investigate the effect of temperature. A higher pyrolysis temperature will produce a porous carbon with a high specific surface area, but it will lower the yield of the produced carbon. At 850 °C temperature, the highest surface area up to 974 m2/g was achieved.

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Solvent fractionation of organosolv lignin to improve lignin homogeneity: Structural characterization

Cited by 30 publications

References 42 publications

The novel method to reduce the silica content in lignin recovered from black liquor originating from rice straw

The novel method to reduce the silica content in lignin recovered from black liquor originating from rice straw

Tuning Lignin Characteristics by Fractionation: A Versatile Approach Based on Solvent Extraction and Membrane-Assisted Ultrafiltration

Lignin Refinery Using Organosolv Process for Nanoporous Carbon Synthesis

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