Effect of the imposition of low-frequency mechanical oscillations on the extraction efficiency

It was shown that the effective transfer of the target component from the raw material occurs under a turbulent regime conditions provided by applying mechanical oscillations to a two-phase system: solid-liquid. Due to this hydrodynamic situation, not only external but also internal diffusion is intensified in the extractor. The method for intensifying the extraction process using low-frequency mechanical oscillations in the case when the vibrational motion is performed by a device with a cheese whey containing suspended porous particles was studied in the work. The experiments were carried out on the laboratory equipment with a supply to a two-phase energy system from the outside, the source of which in the first case was an electromagnet, in the second - a mechanical drive with an eccentric device. Schemes of equipment were also presented in the work. The regime parameters varied in the following ranges: temperature - 40-60 оС, oscillation frequency - 30 - 40 osc / s, amplitude - 1 - 6.5 mm. In the extraction process, the current concentration of extractive substances was obtained from the material balance equation. Extraction curves obtained from experimental data were presented. Increasing extraction of extractive substances in time was observed, it being more intense with the increasing frequency of oscillations. It was found that the growth of the amplitude does not have a significant influence on the change of these indices. The intensity of oscillations was up to 260 mm / s. At the same time, the yield of extractive substances in particular from lupine in the form of grits was 25%, and the duration of the process was 18 min. The experiments showed that the application of the chosen extraction method results into a significant acceleration of the process (up to 2.5 times) as compared to extraction in a dense layer. It is concluded that due to the imposition of mechanical oscillations on the surface and in the pores of the solid phase, there arise oscillations of pressure, relative velocities, as well as the concentrations of the target components of the two-phase system. As a result, the gradients of these parameters that are maximally possible for the investigated process were created.