Production of biodiesel and lactic acid from rapeseed oil using sodium silicate as catalyst |
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Authors: | Long Yun-Duo Guo Feng Fang Zhen Tian Xiao-Fei Jiang Li-Qun Zhang Fan |
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Affiliation: | a Biomass Group, Laboratory of Tropical Plant Resource Science, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 88 Xuefu Road, Kunming, Yunnan Province 650223, China b School of Life Science, University of Science and Technology of China, 443 Huangshan Road, Hefei, Anhui Province 230027, China |
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Abstract: | Biodiesel and lactic acid from rapeseed oil was produced using sodium silicate as catalyst. The transesterification in the presence of the catalyst proceeded with a maximum yield of 99.6% under optimized conditions [3% (w/w) sodium silicate, methanol/oil molar ratio 9/1, reaction time 60 min, reaction temperature 60 °C, and stirring rate 250 rpm]. After six consecutive transesterification reactions, the catalyst was collected and used for catalysis of the conversion of glycerol to lactic acid. A maximum yield of 80.5% was achieved when the reaction was carried out at a temperature of 300 °C for 90 min. Thus, sodium silicate is an effective catalyst for transesterification and lactic acid production from the biodiesel by-product, glycerol. |
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Keywords: | Biodiesel Glycerol Hydrothermal Lactic acid Sodium silicate |
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