超临界二氧化碳萃取枸杞籽油的实验研究与数值模拟

建立了一套超临界流体萃取枸杞籽油的实验流程。以二氧化碳为萃取剂,考察了萃取压力、操作温度、二氧化碳流量及原料颗粒度等因素对枸杞籽油萃取率的影响。确定了较佳的萃取工艺条件:压力30MPa,温度313～318K,枸杞籽颗粒40～50目,二氧化碳流量0.3～0.4m3/h时枸杞籽油萃取率最高,可达15.5%。基于萃取器微分单元和固态颗粒微分单元质量守恒原理,建立了微分方程,利用直线推动力近似理论拟合总传质推动力及平衡吸收常数,化简方程,对部分实验结果进行数值模拟。

Experimental research and simulation of supercritical CO2 extraction for lycium seed oil

The experimental flow for separating lycium seed oil by supercritical fluid extraction is established. The effects of extraction pressure, extraction temperature, flow rate of CO_(2) and feed particle on the extraction yield are investigated using carbon dioxide as extraction reagent. The optimum process conditions are determined: the pressure is 30 MPa, the temperature is 313～318 K, the feed particle is 40～50, and the flow rate of CO_(2) is 0.3～0.4 m~(3)/h. The yield of product reaches 15.5% under the optimum process conditions. Based on the mass conservation principle for differential units of extraction bed and feed particle, the differential equations are established. The total of mass transfer impetus and the equilibrium-absorbing constant are fitted by the linear impetus approximate theory, the equations are simplified, and the experimental results are performed with numeric simulation.