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Hemicellulose extraction from slash pine sawdust by steam explosion with sulfuric acid

Author:
Stoffel, Romina B., Neves, Priscila Vinholi, Felissia, Fernando E., Ramos, Luiz Pereira, Gassa, Liliana M., Area, María C.
Source:
Biomass and bioenergy 2017 v.107 pp. 93-101
ISSN:
0961-9534
Subject:
Pinus elliottii, biorefining, byproducts, cellulose, digestibility, enzymatic hydrolysis, forests, fractionation, hemicellulose, lignin, phytomass, sawdust, steam, sulfuric acid, temperature
Abstract:
One of the main obstacles to the development of advanced forest biorefineries is the optimal fractionation of the plant biomass. The aim of this work was to design a two-stage process for the fractionation of slash pine sawdust: alkaline deresination for extractives removal and sulfuric acid-catalyzed steam explosion (SE) for hemicellulose extraction. SE was carried out in a high-pressure steam reactor under different conditions of temperature (180 °C–200 °C), time (5 min–10 min) and acid concentration (1:100 H2SO4 - 3:100 H2SO4 (on mass of dry wood)) according to a factorial design. Extractives, lignin, carbohydrates, and degradation by-products were quantified. The effect of pretreatment on enzymatic hydrolysis (EH) was also evaluated. SE was very efficient for hemicelluloses extraction (90% at 200 °C with 3:100 H2SO4 (on mass of dry wood) for 5 min) with a high glucan recovery. EH yield increased 6-fold after SE. There was a trade-off between maximizing carbohydrate recovery, hemicellulose extraction, and cellulose digestibility.
Agid:
5840002