Experimental study and simulation of supercritical CO_2 extraction for pepper oils

The experimental device for separating pepper oil by supercritical fluid extraction was established.Carbon dioxide was used as extraction reagent.The effects of extraction pressure,extraction temperature,flow rate and feed particle on extraction were investigated,and the optimum process conditions were determined:the extraction pressure 20-26 MPa,the work temperature 313-323 K,the feel particle of pepper oil 30-40 meshes,the flow rate 0.3-0.4 m~3/h and the cumulation extraction rate of pepper oil 80%-90%.Based on the mass conservation principle for differential units of extraction bed and feed particle,the differential equations were established.The total of mass transfer impetus and the equilibrium absorbing constant were fitted by the linear impetus approximate theory,the equations were simplified,and the experimental results were performed with numeric simulation.