Bioethanol from brewer's spent grains: Acid pretreatment optimization

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2013

Autores

Nídia S. Caetano (Autor) FEUP; Raquel F. Moura (Autor) Outra; Sónia Meireles (Autor) Outra; Adélio M. Mendes (Autor) FEUP; Teresa M. Mata (Autor) FEUP

Ata de Conferência Internacional

Título: 16TH INTERNATIONAL CONFERENCE ON PROCESS INTEGRATION, MODELLING AND OPTIMISATION FOR ENERGY SAVING AND POLLUTION REDUCTION (PRES'13)

Páginas: 1021-1026

16th International Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES)

Rhodes, GREECE, SEP 29-OCT 02, 2013

Indexação

ISI Web of Knowledge - 17 Citações

ISI Web of Science

Scopus - 19 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas

Projetos Associados

PP-IJUP2011-UNICER-333 - Valorização da Drêche na Produção de Bioetanol: Optimização das Etapas de Hidrólise Enzimática e Fermentação

Outras Informações

ID Authenticus: P-008-FMR

DOI: 10.3303/CET1335170

Abstract (EN): This study performs a parametric study aiming at the optimization of the acid pretreatment step of brewer's spent grains (BSG) simultaneously with the enzymatic hydrolysis for conversion into simple sugars fermentable to bioethanol. For this purpose three acids and five enzymes were tested, by adding each two acids (HCl with H2SO4 or HCl with HNO3) either in mixture (in one step) or sequentially (in two steps), to 25 g of dry BSG, together with varying quantities of the enzymes. Results show that when using Viscozyme L or the mixture of Cellulase and Hemicellulase by action of two acids in mixture, the total sugars conversion ranges between 20-27 wt%, in which the mixture of HCl and H2SO4 promotes a greater release of glucose plus maltose, while the mixture of HCl and HNO3 promotes the release of higher amount of xylose and arabinose. Results also show that when Glucanex 100g and Ultraflo L are used simultaneously with the sequential addition of HCl and H2SO4, the highest total sugars conversion (54.5 wt%) is obtained using 2.30 mL of Ultraflo L and 1.67 g of Glucanex 100g. Furthermore, by increasing the amount of Glucanex 100g (from 1.67 to 2.48 g) to the same amount of Ultraflo L (2.30 mL) the total sugars conversion decreased from 54.5 wt% to 40.5 wt%. Moreover, a greater release of glucose was verified by increasing the amount of Ultraflo L (from 1.75 mL to 2.30 mL), while by increasing the amount of Glucanex 100g (from 1.67 to 2.48 g) the release of arabinose and maltose was enhanced. Also, when using Glucanex 100g and Ultraflo L simultaneously with the acids HCl and HNO3, the best method to obtain high conversions of sugars is by the sequential addition of the acids, instead of in mixture. In this work, it resulted in the best conversion of BSG to simple sugars (72.1 wt%), corresponding to about 720 g of sugars per kg of dry BSG.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6