title: In-situ transesterification of wet spent coffee grounds for sustainable biodiesel production.
abstract: This work addresses in-situ transesterification of wet spent coffee grounds (SCGs) for the production of biodiesel. For in-situ transesterification process, the methanol, organic solvent and acid catalyst were mixed with wet SCG in one pot and the mixture was heated for simultaneous lipid extraction and transesterification. Maximum yield of fatty acid methyl esters (FAME) was 16.75wt.% based on the weight of dry SCG at 95°C. Comprehensive experiments were conducted with varying temperatures and various amounts of moisture, methanol, co-solvent and acid catalyst. Moderate polar and alcohol-miscible organic solvent is suitable for the high FAME yield. Unsaturated FAMEs are subject to oxidative cleavage by nitric acid and shorter chain (C6 and C10) FAMEs were mainly produced while sulfuric acid yielded long chain unsaturated FAMEs (C16 and C18). Utilization of wet SCGs as a biodiesel feedstock gives economic and environmental benefits by recycling the municipal waste.
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Jeongseok
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Bora
authors.initials: B
authors.lastname: Kim
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea. Electronic address: jaewlee@kaist.ac.kr.
authors.forename: Jae W
authors.initials: JW
authors.lastname: Lee
mesh_terms: D056804:Biofuels; D003069:Coffee; D004951:Esterification; D005227:Fatty Acids / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D000432:Methanol / Q000737:chemistry / Q000378:metabolism; D059027:Recycling
chemical_list: D056804:Biofuels; D003069:Coffee; D005227:Fatty Acids; D000432:Methanol
keywords: Biodiesel; Spent coffee ground (SCG); Wet in-situ transesterification