SOLID-LIQUID PHASE EXTRACTION UNIT AND SOLID-LIQUID PHASE EXTRACTION METHOD Russian patent published in 2009 - IPC B01D11/02 

FIELD: mechanics.

SUBSTANCE: invention is used for solid-liquid extraction to extract components, extracts, juices from solid-phase materials, low-succulent and succulent vegetable and animal raw materials, hydrobionts, and dispersion fluids and pulps. The unit is comprised of a grinder, infuser, decanting thickener for infused pulp, mixer, shell-and-tube tube-in-tube extractor with convective permeable inner tube and pulse system and decanting thickener for extracted pulp. The extractor shell is separated by longitudinal baffles in even number of channels with extractant inlet nozzles on one end and extractant discharge nozzles on the other end. Pulp is fed into the tube and extractant is fed in counter-flow into the extractor shell channels. The pulse system creates alternating differential pressures between the longitudinal channels of the extractor shell. The infuser and mixer are connected by return pipe to the extract outlet of the extractor shell, and liquid-phase outlet of the extracted pulp decanting thickener is connected to fresh extractant inlet of the extractor. Options for extraction of moderately grindable raw materials, such as drupaceous and seed raw materials and grapes, include auger with rotary drive in the inner tube of the extractor. Solid-liquid phase extraction method includes raw materials grinding and mixing with liquid for fluid pulp formation, counterflow convective mass transfer between pulp and extractant flows in adjacent channels with permeable walls while creating alternating differential pressures between them for repeated transverse liquid-phase exchange to produce extracted pulp and extractant, extracted pulp thickening and return of the liquid phase thus obtained into the process, whereby ground materials are mixed with recirculated extract and liquid phase obtained during extracted pulp thickening is mixed with fresh extractant being fed for extracting. In one of the versions low-succulent raw materials are infused and thickened with a part of the recirculated extract to obtain one product - infused extract, and thickened pulp is mixed with the other part of the extract and fed for extracting. In the second version first product - natural juice is extracted from succulent raw materials and flown down pulp is mixed with a part of extract and fed for extracting to obtain the second product - extract of flown down pulp. Raw materials are ground into dispersion particles of sizes greater than those of perforations in the permeable inner tube being used, within 0.05 to 5.0 mm. Porosity within 0.6 to 0.83 is maintained in the pulp fed to the extractor. Relation between the dose of fresh extractant being used and the volume of processed raw materials is maintained within 0.33 to 1.0.

EFFECT: increased rate of component extraction from raw materials, increased unit capacity for extracted components with reduced number of processing steps and units of equipment to be used.

17 cl, 6 dwg, 1 tbl