Concentration of Alkaline Hydrogen Peroxide (AHP) Affects the Recycle of the Liquid Fraction in the Pre-treatment and En
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ORIGINAL PAPER
Concentration of Alkaline Hydrogen Peroxide (AHP) Affects the Recycle of the Liquid Fraction in the Pre‑treatment and Enzymatic Hydrolysis of Corn Stover Bárbara Ribeiro Alves Alencar1 · Fernanda Leitão Vaz2 · Adauto Gomes Barbosa Neto3 · Katia Aparecida Aquino4 · Everardo Valadares de Sa Barretto Sampaio2 · Rômulo Simões Cezar Menezes2 · Emmanuel Damilano Dutra2,5 Received: 13 June 2019 / Accepted: 16 November 2019 © Springer Nature B.V. 2019
Abstract Pre-treatment is one of main economic and technological challenges to render feasible the production of biofuels and chemical compounds from lignocellulosic biomass. Alkaline hydrogen peroxide (AHP) is the most used pre-treatment and recycling of its liquid fraction can help reduce production costs. The effects of four AHP concentrations (1, 3.5, 5 and 7.5% v/v) on the recycling performance of the liquid fraction of pre-treated corn stover was evaluated for five consecutive cycles. Delignification rates increased with increasing AHP concentrations in the first cycle: 15, 26, 43 and 76% with 1, 3.5, 5 and 7.5% v/v H2O2, respectively. In the following cycles, the rates decreased linearly reaching less than 40% in the last two recycles. These delignification rates and hemicellulose solubilization were corroborated by spectroscopic analyses with Fourier transformation showing reductions in lignin and hemicellulose absorbance and increases in crystallinity indices. Considering the low delignification rates in the last two cycles, the pre-treated biomasses obtained until the third cycle were submitted to enzymatic hydrolysis at 1:10 solid–liquid ratio. The delignification rates affected the efficiency of the enzymatic hydrolysis at all AHP concentrations and all recycles. The highest AHP concentration (7.5% v/v) was required to efficiently remove lignin and solubilize hemicellulose, maintaining cellulose conversion into glucose greater than 50% up to three recycles. Therefore, the technology of recycling the liquid solution of AHP pre-treatment is recommended with high initial concentrations (7.5% v/v). Graphic Abstract
Keywords Lignocellulosic biomass · Pre-treatment · Recycle liquid fraction · Enzymatic hydrolysis
* Emmanuel Damilano Dutra [email protected] Extended author information available on the last page of the article
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Statement of Novelty This work innovates in testing the possibility of recycling the liquid fraction of the pre-treatment of corn stover with alkaline hydrogen peroxide in order to lower pre-treatment costs.
Introduction Fossil fuels use has increased in many industrial sectors, especially the energy one [1], and the energy demand will rise from its current 550 EJ to 860 EJ until 2040 [2]. The transportation sector is one of the main consumers, using liquid fuels derived from fossil sources. The chemical industry is another important sector that uses petroleum derivatives. In Brazil, the market for chemical substances has grown annually between 3 and 5%, in the last years [3]. To replace fossil s
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