A Research On The Process Simulation Of The Supercritical Fluid Extraction Of The Vegetable Oils

In this dissertation, the process simulation of supercritical fluid extraction of solid material and its development are expounded. The representational kinetic models and the advantages and shortage for each one are particularly introduced. Because of the models are immature, the most popular one is discussed, and the improvements of its disadvantages are given. Based on the broken-intact cells model, a new differential mass balance equation is presented. The initial and boundary conditions are obtained by the analysis the process and the acceptable hypotheses, and the numerical solution of the model is given.The SCFE process of nine materials are simulated, the internal mass transfer coefficient of each one is obtained by taking the average relative deviation as the objective function, and the relationship between the grinding efficiency and the mean particle size for some substances are also given. The extraction curve and the average relative deviation for each substance are discussed. The results of this work are contrasted with the conclusions in the references, and they agree well.By simulating different materials, the conclusion of a linear relationship between the grinding efficiency and the mean particle size is first given. And by this conclusion, the two segments of the SCFE process can be exactly distinguished, and the extraction curve at different conditions can be easily predicted. In this article, the effects of grinding efficiency and internal mass transfer coefficient on the extraction curve are discussed.For egg yolk, because of the microstructure is different from vegetable matrix, the result of the simulation does not quite fit the fact. So this model is not fit for simulating non-vegetable systems.