The use of lignocellulosic biomass to obtain fuels and chemicals produces a large amount of lignin as byproduct. Lignin valorization into chemicals needs efficient conversion process to be developed. In this work hydrocracking of organosolv lignin was performed by using Nickel Raney catalyst. Organosolv lignin was obtained from the pretreatment of eucalyptus wood at 170° C for 1h by using 1/100/100 (w/v/v) ratios biomass/oxalic acid solution (0.4% w/w)/1-butanol. The obtained organic phase of lignin in 1-butanol was used in hydrogenation tests. The conversion of lignin was carried out with a batch reactor equipped with a 0.3 l vessel with adjustable internal stirrer and heat control. The reactor was pressurized at 5 bar with hydrogen at room temperature, then the temperature was raised to 250°C and kept for 30 min. During the tests COx and C1-C3 hydrocarbons were produced at low percentage, they were quantified by CG in the stream flowing from the batch reactor when it was depressurized at room conditions. The liquid phase was analyzed by GC-MS to determine low molecular weight fragments; GPC (Gel Permeation Chromatography) was used to determine molecular size distribution before and after the hydrogenation.

Hydrothermal conversion of organosol lignin into phenols by using nickel raney catalyst

Morgana M.;Viola E.;Zimbardi F.;Cerone N.;Romanelli A.;Valerio V.
2019

Abstract

The use of lignocellulosic biomass to obtain fuels and chemicals produces a large amount of lignin as byproduct. Lignin valorization into chemicals needs efficient conversion process to be developed. In this work hydrocracking of organosolv lignin was performed by using Nickel Raney catalyst. Organosolv lignin was obtained from the pretreatment of eucalyptus wood at 170° C for 1h by using 1/100/100 (w/v/v) ratios biomass/oxalic acid solution (0.4% w/w)/1-butanol. The obtained organic phase of lignin in 1-butanol was used in hydrogenation tests. The conversion of lignin was carried out with a batch reactor equipped with a 0.3 l vessel with adjustable internal stirrer and heat control. The reactor was pressurized at 5 bar with hydrogen at room temperature, then the temperature was raised to 250°C and kept for 30 min. During the tests COx and C1-C3 hydrocarbons were produced at low percentage, they were quantified by CG in the stream flowing from the batch reactor when it was depressurized at room conditions. The liquid phase was analyzed by GC-MS to determine low molecular weight fragments; GPC (Gel Permeation Chromatography) was used to determine molecular size distribution before and after the hydrogenation.
Catalytic conversion, Hydrogen, Lignin
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/54643
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