Direct conversion of wet algae to crude biodiesel under supercritical ethanol conditions

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• 作者：Harvind K. Reddy ; Tapaswy Muppaneni ; Prafulla D. Patil ; Sundaravadivelnathan Ponnusamy ; Peter Cooke ; Tanner Schaub ; Shuguang Deng
• 关键词：Single-step conversion ; Supercritical ethanol ; Wet algae ; Biodiesel ; Fatty acid ethyl ester
• 刊名：Fuel
• 出版年：2014
• 出版时间：January, 2014
• 年：2014
• 卷：115
• 期：Complete
• 页码：720-726
• 全文大小：1008 K

文摘

This paper presents a single-step, environmentally friendly approach for the direct conversion of wet algae to crude biodiesel under supercritical ethanol conditions. Ethanol was used for the simultaneous extraction and transesterification of lipids in algae to produce fatty acid ethyl esters at supercritical conditions. In this work the effects of process parameters dry algae to ethanol (wt./vol.) ratio (1:6-1:15), reaction temperature (245-270 ¡ãC), and reaction time (2-30 min.) on the yield of fatty acid ethyl esters (FAEE) were studied. 67 % conversion was achieved at 265 ¡ãC and 20 min of reaction time. The calorific value of a purified biodiesel sample produced at optimum conditions was measured to be 43 MJ/kg, which is higher than that of fatty acid methyl esters produced from the same biomass. The purified fatty acid ethyl esters were analyzed using GC-MS and FTIR. TGA analysis of algal biomass and purified FAEE was presented along with TEM images of the biomass captured before and after supercritical ethanol transesterification. This green conversion process has the potential to provide an energy-efficient and economical route for the production of renewable biodiesel production.