Recovery of valuable compounds from spent coffee grounds using compressed propane/butane followed by scCO2 plus solvent extraction

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL Journal of Supercritical Fluids Pub Date : 2024-05-27 DOI:10.1016/j.supflu.2024.106317

Micheli Nolasco Araujo , Natalia do Carmo Diniz , Fabiane Hamerski , Giuliana Varela Garcia Lesak , Júlio César de Carvalho , Marcos L. Corazza

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Abstract

The sequential extraction of spent coffee grounds (SCG) oil by compressed propane and butane (CPE and CBE) followed by the extraction of phenolic compounds by supercritical CO₂ (scCO₂) plus solvent was studied. Extraction with CPE and CBE at different conditions of pressure (2 – 10 MPa), temperature (40 – 80 ˚C), particle size (0.356 and 0.867 mm), static extraction time (0, 10, 30 and 60 min), dynamic extraction time (25 and 60 min) and solvent flow rate (1, 2 and 3 g/min) reached the maximum extraction yield around 11.5 wt%, and with similar overall extraction curves. The second step of extraction with scCO₂+EtOH (2:1) increased the recovery of phenolics (expressed as GAE, gallic acid equivalent) from 0.9 mg GAE/g_SCG (single-step extraction scCO₂+EtOH (2:1) to 3.88 mg GAE/g_SCG (second step of sequential extraction). The results showed the technical feasibility of the extraction of oil and phenolic extracts by the studied approach.

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使用压缩丙烷/丁烷，然后用 scCO2 加溶剂萃取法从废咖啡渣中回收有价值的化合物

研究了用压缩丙烷和丁烷（CPE 和 CBE）连续萃取废咖啡渣油（SCG），然后用超临界 CO（scCO）加溶剂萃取酚类化合物的方法。在不同的压力（2 - 10 MPa）、温度（40 - 80 ˚C）、粒度（0.356 和 0.867 mm）、静态萃取时间（0、10、30 和 60 分钟）、动态萃取时间（25 和 60 分钟）和溶剂流速（1、2 和 3 g/min）条件下，CPE 和 CBE 的萃取率最大，约为 11.5 wt%，总体萃取曲线相似。使用 scCO+EtOH (2:1) 进行第二步萃取时，酚类物质（以 GAE 表示，没食子酸当量）的回收率从 0.9 mg GAE/g（单步萃取 scCO+EtOH (2:1)）提高到 3.88 mg GAE/g（第二步顺序萃取）。结果表明，采用所研究的方法提取油和酚类提取物在技术上是可行的。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.