Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
ANALYSING THE EFFECT OF HEAT TRANSFER ON THE BIODIESEL PRODUCTION FROM SPENT COFFEE GROUNDS
Submission Author:
Ingryd Krinski , PR
Co-Authors:
Ingryd Krinski, Vinícius Leite, Stephan Hennings Och, Viviana Mariani
Presenter: Ingryd Krinski
doi://10.26678/ABCM.COBEM2023.COB2023-1351
Abstract
Coffee is one of the world's most popular beverages, and its industry generates vast amounts of trash that can be repurposed, amounting to around 5 million tonnes. The most tempting is Spent Coffee Grounds (SCG), which is created after the brewing process and is often thrown as garbage or sent to landfills without proper valorization, but it should be strictly avoided owing to its possible toxicity and organic nature. This trash contains 15 wt% oil, which was extracted and transesterified into biodiesel utilizing ethanol as an extraction solvent and methanol as a transesterification reactant. Because of its high acid value, coffee oil was extracted in a prototype Soxhlet extractor, followed by acid-catalyzed pretreatment. Basic-catalyzed transesterification was used to create biodiesel. This is a common biodiesel production process that involves a reaction between vegetable oil and primary alcohol in the presence of a catalyst to produce esters and glycerol. The oil extraction process was assessed in terms of solid-liquid extraction yield utilizing three distinct solvents with varied SCG particle sizes. Soxhlet extraction yielded a maximum SCG oil yield of 13.87 0.05% when diethyl ether was used, 14.23 0.67% when ethanol was used, and 12.92 0.24% when methanol was used. When the extraction procedure was scaled up, it produced 11.70 0.82% utilizing ethanol as a solvent. The maximum biodiesel yield was produced using a Methanol-to-oil molar ratio of 60:1, a reaction temperature of 60 °C, and 1.6% w/w KOH catalyst. Biodiesel derived from spent coffee grounds appears to be a fascinating and viable solution due to its enhanced heating value as well as low viscosity, density, and corrosion qualities. Furthermore, biodiesel is a nontoxic, biodegradable, and environmentally friendly fuel that contains no aromatics and nearly little sulfur, lessening its environmental impact.
Keywords
biodiesel, Spent Coffee Grounds, Heat transfer, extraction, transesterification
