Centro UTN QUIMOBI - Difusión Científica - Artículos de Revista

Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/674

Browse

Subject: search.filters.subject.rice husk

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Improvement of bioethanol production from rice husks
    (2020-07) Arismendy Pabón, Ana María; Felissia, Fernando Esteban; Mendieta, Carolina Mónica; Chamorro, Ester Ramona; Area, María Cristina
    This work aimed to compare the production of bioethanol from rice husk through simultaneous hydrolysis and fermentation process (SSF) with that through hydrolysis followed by fermentation process (SHF). The raw material was pretreated under mild conditions with sodium hydroxide. Initially, the influence of particle size was evaluated in the enzymatic hydrolysis of pretreated milled and unmilled husk. Subsequently, the efficiencies of Saccharomyces cerevisiae IMR 1181 (SC 1181) and Saccharomyces cerevisiae IMR 1507 (SC 1507) yeasts were compared using the SSF process. Finally, the SSF and SHF processes were compared using the SC 1181 yeast. Although a little more glucose was generated using ground husk (36.6% vs. 35.5%), grinding costs have to be also considered. The SC1507 yeast performed best at all times. The bioethanol yields for SHF and SSF with SC 1181 were of 35.3% and 38.2%, respectively. Maximum yields in SSF were of 43.9% for SC 1507 and 38%for SC 1181.
  • Thumbnail Image
    Item
    Studies on lignin extraction from rice husk by a soda-ethanol treatment : kinetics, separation, and characterization of products
    (2018-01-01) Dagnino, Eliana Paola; Chamorro, Ester Ramona; Felissia, Fernando E.; Area, María Cristina
    The delignification kinetics of lignocellulosic waste is an important tool for the study of the technical-economic viability of biorefinery processes. The aim of this work was to study the kinetic of lignin extraction by a soda-ethanol treatment of hemicelluloses-free rice husk, within the framework of a biorefinery. Additionally, the type of phenolic structures in the extracted lignin and the behavior of inorganics were evaluated. The kinetic study was carried out at 140, 150, and 160 °C, at different times between 3 and 100 min of reaction for each temperature. A first order kinetic model was adjusted to the experimental data of residual lignin in the treated solid in the fast and slow phase. The kinetic constant k0 varied from 0.021 to 0.035 min−1 for 140–160 °C. The activation energies were 38.59 kJ/mol and 33.47 kJ/mol for the fast and slow phase, respectively. The inorganics components remained in the solid and the proportion of silicon increased through all treatments. About 50% of the initial lignin with 1% of inorganics was recovered by precipitation. The percentage of total OH in lignin remained high, about 8.5%, and decreased with the temperature but not with the time of the reaction.