The effect of sugar decomposed on the ethanol fermentation and decomposition reactions of sugars |
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| Authors: | Sang Woo Baek Jun Seok Kim Yoon Kook Park Young Soo Kim Kyeong Keun Oh |
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| Institution: | (1) Department of Industrial Chemistry, Dankook University, Cheonan, 330-714, Korea;(2) Department of Chemical Engineering, Kyonggi University, Suwon, 443-760, Korea;(3) Department of Chemical System Engineering, Hongik University, Yeongi, 339-701, Korea |
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| Abstract: | A batch reactor was used to investigate the dilute acid hydrolysis reaction of alpha-cellulose and sugar decomposition reactions.
Varying the sulfuric acid concentration from 0.07 to 5.0% for reaction temperatures between 180 and 220°C significantly affected
glucose yields, which ranged from about 70% to below 10%. Increasing the reaction temperature enhanced this effect. Similar
experimental results were obtained for the decomposition of xylose. For sugar decomposition reactions, less than 0.3 g/L of
furfural and 5-hydroxymethylfurfural (5-HMF) were produced from glucose and xylose in the absence of sulfuric acid at 190°C
and 15 min of reaction time, but adding a small amount of sulfuric acid (0.5%) dramatically increased the decomposition rate
and led to the formation of four undesireable products: formic acid, 5-HMF, acetic acid, and furfural. In both hydrolysis
and fermentation reactions formic acid, acetic acid, and 5-HMF severely inhibited ethanol fermentation, while furfural had
less of an inhibition effect. |
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| Keywords: | 5-HMF furfural α -cellulose acid hydrolysis sugar decomposition |
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