Studies on Hydrolysis and Electrodialysis for Pretreatment of Saccharum-Miscanthus Leaves in Reducing Sugar Production

• Main Authors: Po-HanChen, 陳柏翰
• Other Authors: Wen-Teng Wu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/45660114174389829531

碩士 === 國立成功大學 === 化學工程學系 === 102 === Saccharum-Miscanthus in the present study is a hybrid of sugarcane and miscanthus from Taiwan Sugar Company. The leaves of the hybrid provide high potential as a biomass for bioenergy production due to its high containing of holocellulose and rapid growth rate. Lignocellulose is the most abundant renewable nature source in the Earth. Hydrolysis of lignocellulose have been applied for reducing sugar production by using concentrated acid under low temperature or dilute acid under high temperature. However, the shortage are 1.acid will corrode the containers. 2. addition of large amount of alkaline solution is required to adjust pH value. 3. it only releases 50-60 % of the theoretical yield of the reducing sugar. 4. reaction of acid hydrolysis will give byproducts which are inhibitors to the following fermentation process. In this work, we investigated the hydrolysis effect of Saccharum-Miscanthus leaves on pretreatment and electrodialysis for recovery of acid. In the proposed process, Saccharum-Miscanthus leaves were first soaked in 30 oC, 4wt % NaOH solution for 6hr followed by 5 wt% H2SO4 solution hydrolysis for under 121 oC, 1.2 atm for 2 hr. The total reducing sugar yield was 0.375 g/g raw material, conversion of holocellulose was 53.34 %. We evaluated the performance of the electrodialysis process by taking electricity consumption and recovery of acid for reusage into account. The experiment results show that the removal efficiency of separation reaches up to 95 % at the optimal conditions of applied voltage gradient 4 V/cm for 160 min, and the energy consumption is approximately 0.087 kWh for 1.5 L solutions. Electrodialysis could recover acid effectively and reduce operation cost for producing reducing sugar.