METHOD OF DIHYDROQUERCETIN EXTRACTION FROM LARCH WOOD, AND DEVICE FOR METHOD IMPLEMENTATION Russian patent published in 2009 - IPC C07D311/40 C07D311/32 B01D11/02 

FIELD: chemistry.

SUBSTANCE: invention concerns organic chemistry, particularly method of dihydroquercetin extraction from larch wood, and can be applied in chemical and pharmaceutical industry, medicine, food industry. Invention claims method of dihydroquercetin extraction from milled larch wood by extraction with organic solvent. Wood is milled into chips, extraction is performed gradually in several stages in at least two extractors, maintaining continuous circulation of one minimal extraction solvent volume required for chip submersion in liquid medium at each stage, simultaneously generating low-frequency oscillating field at temperature close to boiling point of solvent, with further hot extract transport after completion of process at one stage in one extractor volume to the next extraction stage, each time adding new extraction solvent in amount equal to solvent outflow with extracted chips. Then each extracted chip portion is flushed with one minimal solvent volume required, extracts from the last n extraction and flushing stages are combined into one volume, solvent is separated from it, remains are concentrated, and dihydroquercetin is extracted. Invention also claims aggregate for dihydroquercetin extraction from larch wood, including feeding tank, heater, extraction solvent collector and at least one extraction solvent processing lines with further dihydroquercetin extraction from it, each line including inlet and outlet valves, extraction reactor and pulp pump and carrying solvent vapour condenser, heater for solvent heating and low-frequency oscillator in the form of diaphragm pump mounted on pipeline. Each extractor is active periodically and is connected to feeder tank outlet by one of inlets, to extract feed unit by the other inlet over first inlet valve, to condenser inlet by one of outlets. Condenser outlet is connected over second inlet valves to another inlet of each extractor, the other extractor outlet connected to third inlet of each extractor over a sequence of heater, pump, oscillator and third inlet valve. Third extractor inlets are connected to extraction solvent collector over third pump and fourth valve.

EFFECT: reduced extraction agent expenditure.

5 cl, 2 dwg, 3 tbl, 2 ex