2026-05-27T05:36:37Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/389962026-02-03T11:18:45Zcom_10630_2254col_10630_37953

Pérez-Merchán, Antonio Manuel Cecilia-Buenestado, Juan Antonio Mérida-Robles, Josefa María Moreno-Tost, Ramón Malpartida-García, Irene Maireles-Torres, Pedro Jesús 2025-06-16T10:44:13Z 2025-06-16T10:44:13Z 2025-06-15 Pérez-Merchán, A. M., Cecilia, J. A., Mérida-Robles, J. M., Moreno-Tost, R., Malpartida-García, I., & Maireles-Torres, P. (2025). Semi-continuous flow mechanochemistry as a tool for the valorization of spent coffee grounds for biorefinery. Waste Management, 204, 114946. 0956-053X https://hdl.handle.net/10630/38996 10.1016/j.wasman.2025.114946 Spent coffee grounds (SCG) are a by-product of the coffee industry, with its production steadily increasing. In this study, a sequential biorefinery process for the valorization of SCG was investigated, aiming to produce biodiesel, 5-hydroxymethylfurfural (5-HMF) and activated carbon as products of significant industrial interest. In all these processes, conventional and mechanochemical-assisted methodologies were evaluated aiming at process intensification. Firstly, lipids were extracted from SCG and subsequently transformed into biodiesel using calcium diglyceroxide (CaDG) as heterogeneous catalyst, achieving a yield of 98.4 %. Afterwards, autohydrolysis of extracted SCG has allowed the recovery of hemicellulosic liquors, containing 22 % sugars in solution in the form of monomers (mainly C6) and oligomers. These sugar solutions were subjected to dehydration in a water, using CaCl2 and Al2O3, resulting in a maximum 5-HMF yield of 65 %. Finally, the residue obtained after these sequential processes, primarily composed of cellulose and lignin, underwent pyrolysis with KOH as an activating agent, producing activated carbon with a maximum surface area of 1359 m2/g. This cascade biorefinery approach demonstrates a sustainable pathway for SCG utilisation by minimizing waste and maximizing the production of valuable products. eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Café - Industria Mecanoquímica Hidrólisis Monosacáridos Semi-continuous flow mechanochemistry as a tool for the valorization of spent coffee grounds for biorefinery journal article