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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Optimization of lignin recovery from sugarcane bagasse using ionic liquid aided pretreatment

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Author(s):
Saha, Koel ; Dasgupta, Jhilly ; Chakraborty, Sudip ; Fernandes Antunes, Felipe Antonio ; Sikder, Jaya ; Curcio, Stefano ; dos Santos, Julio Cesar ; Arafat, Hassan A. ; da Silva, Silvio Silverio
Total Authors: 9
Document type: Journal article
Source: Cellulose; v. 24, n. 8, p. 3191-3207, AUG 2017.
Web of Science Citations: 12
Abstract

Ionic liquid 1-ethyl-3-methylimidazolium acetate ({[}EMIM]oAc) was employed for the pretreatment of sugarcane bagasse (SCB) and extraction of lignin, a potentially valuable by-product of the biofuel industry. Response surface methodology based on central composite design was exploited and thereby an empirical model, exhibiting a coefficient of determination, R-2, of 0.9890, was established to optimize lignin recovery. In particular, a maximum lignin yield, equal to 90.1%, was calculated at the optimal pretreatment conditions, namely time: 120 min, temperature: 140 degrees C, and ionic liquid to bagasse ratio equal to 20:1 (wt/wt). The presence of guaiacyl and syringyl rings in lignin was confirmed by Fourier transform infrared spectroscopy (FTIR); whereas UV-Vis spectrophotometry showed that both p-coumaric acid and ferulic acid were contained in the lignin. Thermal analysis indicated a maximum decomposition rate of 2%/degrees C at 265 degrees C while Gel permeation chromatography analysis revealed that the molecular weight (M-w) of recovered lignin was equal to 1769 g/mol. Comparison of FTIR spectra of pretreated and untreated bagasse showed a negligible presence of lignin in the pretreated samples. Maximum delignification of bagasse after pretreatment was thus ensured. Thermal stability of the ionic liquid towards recyclability was proven by thermogravimetric analysis. The present study established adequate performance of neat and recycled ({[}EMIM]oAc) with regard to lignin recovery from SCB. (AU)

FAPESP's process: 14/27055-2 - Processes intensification of lignocellulosic biorefineries integrating ethanol and xylitol production steps from sugarcane bagasse in fluidized bed bioreactor
Grantee:Felipe Antonio Fernandes Antunes
Support Opportunities: Scholarships in Brazil - Post-Doctoral