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Analysis of the operation conditions for supercritical fluid extraction of seed oil

机译：超临界流体萃取种子油的操作条件分析

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摘要

In this paper,a SCFE set-up with an extraction volume of 1 L was established,with which Hippophae rhamnoides L.seed oil was extracted using supercritical CO_2.The experiments show that many factors have impacts on the oil yield,such as extraction pressure,temperature,and fluid flow rate,as well as seed particle size and filling quantity.For the extraction process of Hippophae rhamnoides L.seed oil,the optimum conditions were as follows:extraction pressure of 20-30 MPa,extraction temperature of 35-40degC,supercritical CO_2 flow rate of 0.15-0.3 m~3/h,and extraction time of 4-5 h.Under such a condition,the oil obtained is very lucid and good quality,and the yield is as high as above 90%.GC analysis shows that the oil contains 11.44% of saturated fatty acid and 88.56% of unsaturated fatty acid.From the changes of oil yield with the extraction time,it can be concluded that the extraction process contains three stages:fast extraction stage (approximate a linear style),transitional stage (very short period of time) and the slow extraction stage (just a little amount of oil can be extracted in this stage).At the first stage,75-80% of the oil has been extracted out.
机译：本文建立了一种萃取体积为1 L的SCFE装置，利用超临界CO_2萃取了沙棘种子油。实验表明，萃取压力等诸多因素都会影响油的收率。沙棘种子油的提取工艺条件为：提取压力为20-30 MPa，提取温度为35- 40℃，超临界CO_2流速为0.15-0.3 m〜3 / h，萃取时间为4-5 h。在这种条件下，所得到的油非常清澈，品质优良，收率高达90％以上气相色谱分析表明，该油中含11.44％的饱和脂肪酸和88.56％的不饱和脂肪酸。从油的得率随萃取时间的变化，可以得出萃取过程包括三个阶段：快速萃取阶段（近似）。线性样式），过渡阶段（ve在很短的时间内）和缓慢的提取阶段（在此阶段只能提取少量的油）。在第一阶段，已提取了75-80％的油。

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