Open Access

ARTICLE

Liquefaction of Kraft Lignin at Atmospheric Pressure

Silvia Helena Fuentes da Silva¹, Patricia Soares Bilhalva dos Santos², Darci Alberto Gatto³, Maria Angeles Andres¹, Itziar Egüés^1,*

1 Chemical and Environmental Engineering Department, University of Basque Country, Plaza Europa 1, 20018, Donostia-San Sebastián, Spain.
2 Faculty of Forestry Engineering, Federal University of Pará, C. José Porfirio, 2515, Altamira, Brazil.
3 College of Material Engineering (PPGCEM), Federal University of Pelotas, Brazil.

*Corresponding Author: Itziar Egüés. Email: .

Journal of Renewable Materials 2019, 7(6), 527-534. https://doi.org/10.32604/jrm.2019.04291

Abstract

Kraft lignin was liquefied using polyethylene glycol #400 (PEG) and glycerol (G) in a weight ratio of 80/20 (w/w) and sulphuric acid (SA) as catalyst under atmospheric pressure at 160ºC. The three independent variables: reaction time (60, 80 and 100 min), percentage of lignin (15, 20 and 25%, w/w), and catalyst concentration (0, 3 and 6%, w/w), were varied resulting in 27 experimental runs. The effect of these reaction conditions on the properties of the polyols was evaluated. The statistical analysis showed that only “the percentage of lignin” did not influence the properties of the liquefied products, however, reaction time and catalyst load were important parameters. The resulting liquefied products were characterized by FTIR analysis.

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