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首页> 外文期刊>American Journal of Analytical Chemistry >A Simplified Method to Estimate the Time Evolution of Oil Extraction from Different Substrates by Supercritical CO2
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A Simplified Method to Estimate the Time Evolution of Oil Extraction from Different Substrates by Supercritical CO2

机译:一种估算超临界CO2从不同基质中提取油的时间演变的简化方法

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To allow an easy individuation of the more suitable working conditions (temperature, pressure, flow rate, etc.) to be adopted to carry out the extraction of food grade oils from different substrates by supercritical CO2 (Sc-CO2), a simpli- fied kinetic approach has been introduced. This kinetic model was utilised to describe supercritical fluid extraction (SFE) of oil by Sc-CO2 not only from seeds (sunflower, soybean and rape) but also from microalgae (Nannochloropsis sp., Schizochytrium sp. and Spirulina (Arthrospira) platensis) characterised by a lipid fraction with a high proportion of polyunsatured fatty acids (C20:5w-3; C22:6w-3; C18:3w-6). Thanks to the high affinity occurring between oil and Sc-CO2 it was possible to introduce a simplified kinetic model able to describe the time evolution of oil extraction from substrates which deeply differ for biochemical and biophysical characteristics. Moreover the synergistic utilisation of the kinetic model introduced and of the Chrastil’s equation, allowed to predict the time evolution of oil extraction as a function of the: substrate used; amount of its fat content; mass of substrate charged inside the extractor; possible pre- treatments carried out on the used substrate; flow rate of Sc-CO2; working conditions adopted (temperature, pressure and then Sc-CO2 density).
机译:为了便于区分更适合的工作条件(温度,压力,流速等),采用超临界CO2(Sc-CO2)从不同的基质中提取食品级油,动力学方法已被引入。利用该动力学模型描述了Sc-CO2不仅从种子(向日葵,大豆和油菜)而且还从微藻类(Nannochloropsis sp。,Schizochytrium sp。和Spirulina(Arthrospira)platensis)中通过Sc-CO2萃取油的超临界流体(SFE)。通过具有高比例的多不饱和脂肪酸的脂质级分(C20:5w-3; C22:6w-3; C18:3w-6)。由于油与Sc-CO2之间的亲和力高,因此有可能引入一个简化的动力学模型,该模型能够描述从底物提取油的时间演变,而底物的生化和生物物理特性差异很大。此外,所引入的动力学模型和Chrastil方程的协同利用,可以预测采油时间随使用的底物的变化而变化。脂肪含量;装入萃取器内部的底物质量;在用过的基材上可能进行的预处理; Sc-CO2的流速;采用的工作条件(温度,压力,然后是Sc-CO2密度)。

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