Coffee industry generates large amounts of organic waste, including residues obtained during instant coffee production, referred to as spent coffee grounds (SCG). In this work, methods for extraction and fractionation of oil from SCG, focusing on the phenolic compounds content (TPC), were investigated at 333 K and 40 MPa, in one or two steps, with different solvents: pure supercritical CO₂ (scCO₂), ethanol and supercritical mixture of CO₂ with ethanol (90:10 w/w). Fractionation was also evaluated in four separators aligned in series at 323 K at different pressures and ethanol concentrations. The ethanolic extract (E) presented the highest overall yield (25 wt%). Samples from the first separator obtained during fractionation of ethanolic extract showed TPC values up to four times higher than the original extract. Similar TPC enrichment was observed via two-step extraction. The results indicated the methods proposed are efficient to obtain extracts from SCG with higher content of phenolics.

咖啡行业会产生大量有机废物，包括速溶咖啡生产过程中获得的残留物，称为废咖啡渣（SCG）。在这项工作中，研究了在333 K和40 MPa下用一种或两种步骤，使用不同的溶剂，从SCG中提取和分馏油的方法，重点是酚类化合物的含量（TPC）：纯超临界CO ₂（scCO ₂），乙醇和CO _2的超临界混合物用乙醇（90:10 w / w）。还评估了在323 K下在不同压力和乙醇浓度下串联排列的四个分离器中的分离度。乙醇提取物（E）的总收率最高（25 wt％）。在乙醇提取物分级分离过程中，从第一个分离器获得的样品的TPC值比原始提取物高出四倍。通过两步萃取观察到相似的TPC富集。结果表明，所提出的方法可有效地从SCG中提取具有较高酚含量的提取物。