PECULIARITIES OF SORPTION CONCENTRATION OF SAPONIN QUALIAJA SAPONARIA MOLINA ON NATURAL POLYMER-CHITOSANE IN DYNAMIC AND STATIC CONDITIONS
Abstract
The effect of changing the technological parameters of the sorption of Quillaja Saponaria Molina saponin by a natural sorbent - chitosan under dynamic and static conditions on the sorption rate and the amount of absorbed substance - is studied. The absence of influence of the concentration of the solution of saponin on the rate of sorption absorption indicates the presence of steric and kinetic factors that reduce the effectiveness of concentration of saponin during sorption under dynamic conditions. The planar orientation of the saponin molecules shields the active centers of chitosan, making it difficult to move the sorbate deeper into the underlying layers, so the rate of passage of the solution does not change the rate of sorption and the capacity of chitosan by the saponin.
The values of the effective diffusion coefficients, the Bio criterion, and the distribution coefficients, which allowed us to determine the intradiffusion limitation of the sorption process and the effect of the association of the saponin molecules in solution and sorbent on the sorption parameter value, are calculated. The principal differences in the absorption of saponin by chitosan in static and dynamic conditions are revealed. The efficiency of the concentration is increased by sorption under equilibrium conditions, ensuring, with constant mixing, greater availability of the active centers of chitosan.
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