Fast and Efficient Method to Evaluate the Potential of Eutectic Solvents to Dissolve Lignocellulosic Components

Sosa, Filipe H. B.; Dias, Rafael M.; Lopes, André M. da Costa; Coutinho, J.; Costa, Mariana C.

doi:10.3390/su12083358

Cited by 12 publications

(3 citation statements)

References 63 publications

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“…20 However, the study of lignin dissolution in DES, especially technical lignins from well-established delignification processes (e.g., kraft pulping), toward their further valorization is still barely examined. 21,22 Francisco et al 23 investigated a wide range of DES to dissolve low sulfonated kraft lignin and cellulose. The authors used carboxylic acids as HBDs, while alanine, betaine, [Ch]Cl, glycine, histidine, proline, and nicotinic acid were chosen as HBAs.…”

Section: ■ Introductionmentioning

confidence: 99%

Kraft Lignin Solubility and Its Chemical Modification in Deep Eutectic Solvents

Sosa

Abranches

Lopes

et al. 2020

ACS Sustainable Chem. Eng.

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Lignin stands as a promising raw material to produce commodities and specialty chemicals, yet its poor solubility remains a big challenge. Recently, deep eutectic solvents (DES) have been proposed as sustainable solvents with high potential to dissolve and valorize lignin. In the present study, the ability of DES based on cholinium chloride ([Ch]Cl) combined with alcohols and carboxylic acids as hydrogen bond donors (HBDs) to dissolve kraft lignin and to change its chemical structure was examined. The influence of the chemical nature of HBDs, water content, and HBD:hydrogen bond acceptor (HBA) molar ratio on the solubility of kraft lignin in DES was studied (313.15 K). The kraft lignin solubility was enhanced by increasing both the HBD’s carbon chain length and the molar ratio, with [Ch]Cl:HEXA (1,6-hexanediol) and [Ch]Cl:MaleA (maleic acid) being the best studied solvents for kraft lignin dissolution, while the addition of water was a negative factor. The thermal treatments (393.15 K) of kraft lignin show that carboxylic acid-based DES promote chemical modifications to kraft lignin, including the disruption of several C–O covalent type bonds (e.g., β-O-4, α-O-4 and α-O-α), while alcohol-based DES were found to be nonderivatizing solvents maintaining the lignin chemical structure. These results show the versatility of DES, which, depending on their chemical nature, may offer distinct strategies for lignin valorization.

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Section: ■ Introductionmentioning

confidence: 99%

Kraft Lignin Solubility and Its Chemical Modification in Deep Eutectic Solvents

Sosa

Abranches

Lopes

et al. 2020

ACS Sustainable Chem. Eng.

Self Cite

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“…It can be seen from Table 2 that among the tested and reported DESs, 17 LA : ChCl in the ratio of 10 : 1 was an excellent solvent for AL and a commonly used DES for biomass pretreatment. 12,[22][23][24] Therefore, LA-ChCl (LA : ChCl 10 : 1) was chosen as the DES to dissolve AL.…”

Section: Resultsmentioning

confidence: 99%

Possible dissolution mechanism of alkali lignin in lactic acid-choline chloride under mild conditions

Liu

Hou

et al. 2020

RSC Adv.

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“…These features drew attention to apply DESs in lignin dissolution 30 and biomass delignification. 31,32 Several studies have reported acidic DESs, such as those formed by the combination of cholinium chloride ([Ch]Cl) as a HBA and carboxylic acids, including oxalic acid (Oxa), formic acid (For) and lactic acid (Lac) as a HBD, as efficient solvents for the extraction and dissolution of lignin from biomass.…”

Section: Introductionmentioning

confidence: 99%