FRRE - Producción de Investigación

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Author: search.filters.author.Dagnino, Eliana PaolaSubject: search.filters.subject.biorefinery

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    Levulinic acid obtention from lignocellulosic waste of agroforestry-industrial of different origins
    (2023-08-04) Ruiz, Carlos Raúl; Sequeira, Alfredo Fabián; Dagnino, Eliana Paola
    Worldwide, since last decade levulinic acid (LA) was one of the most sought-after chemical precursors. Lignocellulosic waste of agroforestry-industrial origin like rice hulk, sawdust, and cotton stubble are pointed as raw material for this work, at the same time those lignocellulosic wastes are abundant in Argentina´s northeastern. Report about the evaluation of LA obtention reaction using different raw materials obtained in different treatment steps and maintaining the same operation conditions is the main objective of this work. This objective aims to demonstrate the technical feasibility to obtain LA from a lignocellulosic waste biorefinery scheme. The reaction was running in a cylindrical steel reactor (AISI 316) provided with a manometer and a security valve to ensure the maximum pressure work. The reactor was heated indirectly in a heat-resistant silicone bath. The raw material used were rice hulk (pretreated to extract hemicellulose, lignin, and inorganic compounds), Prosopis nigra sawdust (pretreated to extract lignin and others), and cotton stubble (two fractions one rich in the ground cotton husk and other rich in cotton fiber).
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    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.