Abstract: The invention relates to a process for the extraction of wood, comprising the following steps: providing wood particles, at least a first class and a second class, stacking a fine layer consisting of the first class wood particles over a further layer consisting of the second class wood particles, and extracting the wood particles using a liquid extractant, in which the extractant flows from the top downwards, first through the fine layer and then through the further layer, in which the wood particles of the first class are finer than the wood particles of the second class, and thus the fine layer has a lower permeability than the further layer.

Abstract: The invention relates to a process for the manufacture of taxifolin, comprising the following steps: stacking the wood particles in a percolator, extracting the wood particles in the percolator using ethanol to dissolve at least resins, oils, and taxifolin, discharging the ethanolic extract from the percolator, and purifying the ethanolic extract for the manufacture of taxifolin with the following steps in the specified order: preparing a mixture of water and the ethanolic extract, mixing the mixture at between 70° C. and 99° C. so that taxifolin in the aqueous phase of the mixture goes into the solution, cooling the mixture to below 65° C. for separating and removing the resin phase and the oil phase from the water phase, adding taxifolin seed crystals to the water phase, temperature controlling the water phase at between 0° C. and 30° C. for the crystallization of taxifolin, and separating the crystallized taxifolin from the mother liquor.

Abstract: The invention relates to a process for the manufacture of taxifolin, comprising the following steps: stacking the wood particles in a percolator, extracting the wood particles in the percolator using ethanol to dissolve at least resins, oils, and taxifolin, discharging the ethanolic extract from the percolator, and purifying the ethanolic extract for the manufacture of taxifolin with the following steps in the specified order: preparing a mixture of water and the ethanolic extract, mixing the mixture at between 70° C. and 99° C. so that taxifolin in the aqueous phase of the mixture goes into the solution, cooling the mixture to below 65° C. for separating and removing the resin phase and the oil phase from the water phase, adding taxifolin seed crystals to the water phase, temperature controlling the water phase at between 0° C. and 30° C. for the crystallisation of taxifolin, and separating the crystallised taxifolin from the mother liquor.

Abstract: The invention relates to a process for the extraction of wood, comprising the following steps: providing wood particles, at least a first class and a second class, stacking a fine layer consisting of the first class wood particles over a further layer consisting of the second class wood particles, and extracting the wood particles using a liquid extractant, in which the extractant flows from the top downwards, first through the fine layer and then through the further layer, in which the wood particles of the first class are finer than the wood particles of the second class, and thus the fine layer has a lower permeability than the further layer.