Oil extraction from spent coffee grounds (SCG) using isopropanol at different extraction time / Muhammad Aidil Amri ‘Asri

Coffee was one of the most well-known beverages in every region of the world. It was because coffee, which contains caffeine, might provide energy to keep one up at night. After that, the coffee beans went through processing, during which about half of them were turned into trash in the form of a spent coffee ground. Every year, around 9 million tonnes of SCGs are created worldwide, and the waste is disposed of improperly. It evolved into an issue among those leading to the world's contamination. As a result, an experiment was carried out to extract oil from the SCGs by utilising isopropanol as the solvent and applying manual extraction at several times of extraction, including 15 minutes, 30 minutes, 45 minutes, 60 minutes, 75 minutes, and 90 minutes respectively. The experiment lasted for a total of 120 minutes, during which time the highest percentage yield (11.83% of coffee oil) was produced at the 60-minute mark.