Chemical pretreatment of sugarcane bagasse with liquid fraction recycling

Fernanda Leitão Vaz, Jennyfer da Rocha Lins, Bárbara Ribeiro Alves Alencar, Íthalo Barbosa Silva de Abreu, Esteban Espinosa Vidal, Ester Ribeiro, Everardo Valadares de Sá Barretto Sampaio, Rômulo Simões Cezar Menezes and Emmanuel Damilano Dutra

Renewable Energy, 2021, vol. 174, issue C, 666-673

Abstract: Pre-treating lignocellulosic biomass is a major technological challenge. Recycling the liquid fraction may reduce chemical inputs and water use but may have lower efficiency. Seven chemical pre-treatments of sugarcane bagasse were compared: four acids (sulfuric, citric, phosphoric, and oxalic), two alkaline (sodium and calcium hydroxides) and an oxidative (alkaline hydrogen peroxide). The liquid fractions resulting from these pre-treatments were reused up to five times. After each pre-treatment cycle, the solid fraction was hydrolyzed with Celluclast 1.5L enzyme in a 1:10 solid-liquid ratio. Sulfuric and oxalic acids solubilized 80% of the hemicellulose over the cycles. Sodium and calcium hydroxides and hydrogen peroxide removed lignin until the fourth cycle. About 70% of lignin were removed with alkaline hydrogen peroxide. This pre-treatment lead to the highest glucose release after the enzymatic hydrolysis, above 50% in the three cycles analyzed. The best efficiency in enzymatic hydrolysis followed the order H2O2-alkaline > NaOH > oxalic acid > phosphoric acid > H2SO4 > citric acid > Ca (OH)2. With the recycling, more than 62% in reagents used in the pre-treatment of sugarcane bagasse were saved, enabling an economy in the costs at this stage of the process.

Keywords: Acid pre-treatment; Basic pre-treatment; Oxidative pre-treatment; Chemical solution recycling; Enzymatic hydrolysis; Pre-treatment economy (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:174:y:2021:i:c:p:666-673

DOI: 10.1016/j.renene.2021.04.087

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