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Effect of Solvent Extraction Parameters on the Recovery of Oil From Spent Coffee Grounds for Biofuel Production

机译:溶剂萃取参数对废咖啡渣中回收油用于生物燃料生产的影响

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摘要

Spent coffee grounds (SCG) are a potentially valuable source of lipids for sustainable production of biofuels. However, there are several feedstock properties and solvent extraction parameters that can impact on the oil yield and quality, potentially reducing the possible environmental benefits of deriving oils from this waste stream. This study presents results of laboratory and pilot plant scale experimental investigations into lipid recovery from spent coffee, determining the effects of solvent extraction variables including duration, SCG-to-solvent ratio and SCG residual moisture. SCG samples from both the industrial production of instant coffee and retail coffee shops were characterized in terms of moisture content, particle size distribution and oil content to identify the impact of these variables on the efficiency of lipid recovery by solvent extraction. The dry weight oil content of the instant SCG samples ranged from 24.2 to 30.4% w/w, while the retail SCG samples contained considerably lower amounts of lipids with their oil content ranging between 13.4 and 14.8% w/w. The highest oil yields were found at an extraction duration of 8h, while a moisture content of similar to 2% w/w led to increased yields relative to completely dry samples. A pattern of increasing acidity with decreasing extraction duration was observed, suggesting preferential extraction of free fatty acids (FFA), with the fatty acid (FA) profile of the oil found to be similar to lipids commonly utilized for biofuel production.
机译:用过的咖啡渣(SCG)是可持续生产生物燃料的潜在潜在脂质来源。但是,有一些原料特性和溶剂萃取参数会影响油的产量和质量,从而潜在地降低了从这种废物流中提取油的环境效益。这项研究提供了实验室和中试工厂规模实验研究的结果,这些研究涉及从废咖啡中回收脂质,确定溶剂提取变量的影响,包括持续时间,SCG与溶剂的比率以及SCG残留水分。对速溶咖啡和零售咖啡店的工业生产中的SCG样品进行了水分含量,粒度分布和油含量方面的表征,以鉴定这些变量对通过溶剂萃取回收脂质的效率的影响。本发明SCG样品的干重含油量为24.2%至30.4%w / w,而零售SCG样品中所含脂质的含量低得多,其油含量为13.4%至14.8%w / w。在8h的提取时间内发现最高的油产量,而相对于完全干燥的样品,水分含量接近2%w / w导致产量增加。观察到随着提取时间的延长酸度增加的模式,这表明优先提取游离脂肪酸(FFA),发现该油的脂肪酸(FA)谱与通常用于生物燃料生产的脂质相似。

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