Determination of diffusion coefficients of extractives in lupine

The work is presented by two sections: theoretical and applied. In the first section the equation for calculating concentration fields is given. To obtain additional physical information about the process the initial and boundary conditions were recorded. The equation which is the generalised theoretical decision for various geometrical forms of a material is resulted: a sphere, an unlimited cylinder and an unlimited plate. Taking into account the extracting conditions the expressions were written the attractiveness of which is in their suitability for the calculation of the mass flow of the target components of the capillary with a known surface area. The presented theoretical data gave the chance to obtain the equations for calculation of diffusion factors in the material (forms: a sphere, an unlimited cylinder, an unlimited plate). The intuition prompts that these equations are fair for all kinds of raw materials of the plant origin with the capillary porous structure as follow from the base equation which was written down by G.A. Akselrud and V.M. Lysiansky. So diffusion factors, for example, were calculated at the extraction by liquid carbon dioxide from barley grains, acorn fruits and chicory roots crushed into grains and petal. The applied part of work is devoted to the calculation of diffusion factors in a lupine at the extraction by cheese whey and to the analysis of results, using for this purpose experimental data on the kinetics of the process, background in quantitative interpretation was formulated. For example, the lupine particles had the form of a sphere, a cylinder and a plate and as one of their sizes exceeds each of remained in four or more times so the particles can be considered as unlimited bodies. Therefore, one-dimensional diffusion flux towards the minimum size takes place in them. The results of diffusion factors calculations for all forms of material are presented by schedules from which it is obvious that the curves are close to each other and it is possible to present them with one generalised equation The quantitative evaluation of the results is given. One value of diffusion factor is also received, for this purpose the angular coefficient of the straight section being the area of the regular mode was determined. The conclusion is made that the researches carried out do not contradict to modern representations about the extracting mechanism.