Xylitol-Sweetener Production from Barley Straw: Optimization of Acid Hydrolysis Condition with the Energy Consumption Simulation

Purpose Barley straw from brewing process is an attractive and renewable raw material for the production of biofuel and useful chemicals, such as xylitol. It is necessary to determine the best conditions of biomass hydrolysis and fermentation for boosting the incorporation of this biomass in a biore...

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Bibliographic Details
Published in:Waste and biomass valorization 2020-05, Vol.11 (5), p.1837-1849
Main Authors: Moraes, Elisângela de Jesus Cândido, Silva, Débora Danielle Virgínio, Dussán, Kelly Johana, Tesche, Luana Zanchetta, Silva, Joao Batista de Almeida, Rai, Mahendra, Felipe, Maria das Graças de Almeida
Format: Article
Language:English
Subjects:
Ammonium sulfate
Barley
Barley straw
Biofuels
Biomass
Biorefineries
Breweries
Brewing
Calcium chloride
Candida guilliermondii
Energy consumption
Engineering
Environment
Environmental Engineering/Biotechnology
Ethanol
Fermentation
Hemicellulose
Hydrolysis
Industrial Pollution Prevention
Optimization
Original Paper
Pretreatment
Refining
Renewable and Green Energy
Straw
Sulfuric acid
Waste Management/Waste Technology
Xylitol
Xylose
Yeast
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Summary:Purpose Barley straw from brewing process is an attractive and renewable raw material for the production of biofuel and useful chemicals, such as xylitol. It is necessary to determine the best conditions of biomass hydrolysis and fermentation for boosting the incorporation of this biomass in a biorefinery. Methods We optimized the conditions for acid hydrolysis of barley straw to obtain a hemicellulosic hydrolysate rich in xylose with low energy consumption. Moreover, the energy consumption was simulated per quantity of xylose extracted. In order to obtain a hydrolysate with the highest xylose extraction efficiency (99%), low inhibitors concentration and energy consumption (8.41 KW/Kg Xylose), we used 1.0% H 2 SO 4 (w/v) at 120 °C, with 1:10 dry-weight/acid solution for 40 min. We also optimized the medium composition to improve xylitol production by Candida guilliermondii . Results The hemicellulosic hydrolysate was used as a fermentation medium and the best condition showing the highest xylitol volumetric productivity (0.69 g L −1  h −1 ) by C. guilliermondii was found to be 60 g L −1 initial xylose supplemented with 1.5 g L −1 (NH 4 ) 2 SO 4 , 0.75 CaCl 2 and 8.75 g L −1 rice bran extract. Conclusions It can be concluded that barley straw can be used in biorefinery, wherein the hemicellulose fraction would be utilized to produce xylitol and the cellulosic fraction (more accessible to enzymatic hydrolysis after pre-treatment) would be used for the production of cellulosic ethanol. Graphical Abstract
ISSN:1877-2641
1877-265X
DOI:10.1007/s12649-018-0501-9