Oil extraction from spent coffee grounds (SCG) using soxhlet extraction utilizing isopropanol as solvent / Muhammad Ammar Aqil Muhammad Azian

Coffee has the highest industrial production volumes of any beverage and is extremely popular worldwide. Spent coffee grounds (SCG), which are the by-products of the coffee brewing process, are a significant waste product. Hemicellulose, cellulose, lignin, polyphenols, proteins, lipids, and minerals were present in the SCG. The SCG is used in various industries, including cosmetics, fertilizer, biogas, power, food additives, and pharmaceuticals. Oil can be extracted from SCG using various techniques, including Soxhlet and two-phase extraction. The experiment aims to determine the yield of oil from SCG and to use FTIR to identify the component in the oil. The soxhlet extraction process used oil from spent coffee grounds using isopropanol as a polar solvent. Cycle 1 until 6 with a different time periods are used to record the oil yield. According to the data, it takes 39 minutes and 35 seconds to extract the most oil at a yield of 34%. The two distinct peaks at 2922.32 cm-1 and 2852.86 cm-1 that are present in the FTIR results confirm the presence of the methyl and methylene groups. We efficiently extracted oil from old coffee grounds, and we discovered that the oil included a significant number of fatty acids, making it acceptable for various uses.