Estimation of continuous alkali pretreated sweet sorghum bagasse | 52490
Journal of Fundamentals of Renewable Energy and Applications

Journal of Fundamentals of Renewable Energy and Applications
Open Access

ISSN: 2090-4541

Estimation of continuous alkali pretreated sweet sorghum bagasse using single screw reactor for bioethanol production

International Congress and Expo on Biofuels & Bioenergy

August 25- 27, 2015 Valencia, Spain

Young-Lok Cha, Gyeong-Dan Yu, Ji-Eun Lee, Youn-Ho Moon, Gi Hong An, Jong-Woong Ahn and Kyeong-Bo Lee

Posters-Accepted Abstracts: J Fundam Renewable Energy Appl

Abstract :

Sweet sorghum is one of the promising energy crops that can provide both sugar juice and bagasse to conversion for
bioethanol. Ethanol from the extracted sweet sorghum juice can be easily produced by fermentation process. But the
lignocellulosic biomass such as sweet sorghum bagasse has many barriers for ethanol production. For commercial production
of bioethanol, effective pretreatments of lignocellulosic materials need to be developed for the reduction of processing costs. In
this study, continuous pretreatment system with single screw reactor was applied for the effective hydrolysis of sweet sorghum
bagasse. Conditions of hydrolysis were different concentrations of sodium hydroxide (0.2~1.0 M) at 140°C, 1.2 kg/min of
biomass loading rate and 7.2L/h of aqueous sodium hydroxide. In case of 0.4 M sodium hydroxide for pretreatment of sweet
sorghum bagasse, solid phase was recovered, 49.9% from dry matter sweet sorghum bagasse and its compositions were 59.2%
of cellulose, 31.7% of hemicellulose, 6.9% of lignin and 0.9% of ash. Saccharifications of pretreated bagasse were performed
with different concentrations of enzyme (between 5 and 15 FPU/g-cellulose from Novozymes) in 72 h, 150 rpm at 50°C. The
optimum enzyme loading was 10 FPU/g-cellulose and at this optimum condition the maximum yield of glucose conversion
was 88.0% after 72 h. It was produced 25.1 g/L ethanol from pretreated sweet sorghum bagasse (60 g/L glucan) and maximum
ethanol yield was 91% by Saccharomyces cerevisiae CHY1011.

Biography :

Young-Lok Cha is a Doctorate at the University of Hannover, Germany. He is working as a Senior Researcher at the National Institute of Crop Science, Rural
Development Administration, Korea. He has done his major in the development of lignocellulosic biomass conversion technology and biofuels production at pilot scale.