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Author(s): Teresa M. Mata
António A. Martins
Nídia S. Caetano
Vânia F. M. Silva
Ana C. Melo
Title: Spent coffee grounds for biodiesel production and other applications
Issue Date: 2014-10-01
Abstract: This work evaluates the possibility of usingspent coffee grounds (SCG) for biodiesel production andother applications. An experimental study was conductedwith different solvents showing that lipid content up to6 wt% can be obtained from SCG. Results also show thatbesides biodiesel production, SCG can be used as fertilizeras it is rich in nitrogen, and as solid fuel with higherheating value (HHV) equivalent to some agriculture andwood residues. The extracted lipids were characterized fortheir properties of acid value, density at 15 C, viscosity at40 C, iodine number, and HHV, which are negativelyinfluenced by water content and solvents used in lipidextraction. Results suggest that for lipids with high freefatty acids (FFA), the best procedure for conversion tobiodiesel would be a two-step process of acid esterificationfollowed by alkaline transesterification, instead of a solestep of direct transesterification with acid catalyst. Biodiesel was characterized for its properties of iodine number, acid value, and ester content. Although these qualityparameters were not within the limits of NP EN14214:2009 standard, SCG lipids can be used for biodiesel,blended with higher-quality vegetable oils before transesterification, or the biodiesel produced from SCG can beblended with higher-quality biodiesel or even with fossildiesel, in order to meet the standard requirements.
Subject: Engenharia
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/PEst-C/EQB/UI0511/2013/PROJECTO ESTRATÉGICO - UI 511 - 2013-2014/UI0511
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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