期刊
BIORESOURCE TECHNOLOGY
卷 259, 期 -, 页码 465-468出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.03.067
关键词
Spent coffee ground (SCG); Subcritical water; Biodiesel; Supercritical methanol; In situ transesterification
资金
- Advanced Biomass R&D Center (ABC) as the Global Frontier Project - Ministry of Science, ICT and Future Planning, South Korea [ABC-2010-0029728]
This work introduces biodiesel production from wet spent coffee grounds (SCGs) with supercritical methanol without any pre-drying process. Supercritical methanol and subcritical water effectively produced biodiesel via in situ transesterification by inducing more porous SCG and enhancing the efficiency of lipid extraction and conversion. It was also found that space loading was one of the critical factors for biodiesel production. An optimal biodiesel yield of 10.17 wt% of dry SCG mass (86.33 w/w% of esterifiable lipids in SCG) was obtained at reaction conditions of 270 degrees C, 90 bars, methanol to wet SCG ratio 5:1, space loading 58.4 ml/g and reaction time 20 min. Direct use of wet SCG waste as feedstock for supercritical biodiesel production eliminates the conventional dying process and the need of catalyst and also reduces environmental problems caused by landfill accumulation.
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