# US 9,434,790 B2 · Process for the extraction of wood

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- Number: US 9,434,790 B2
- Document ID: US9434790B2
- Status: Granted
- Kind: B2
- Application number: 14/376,399
- Filed: 2012-02-02
- Published: 2015-03-19
- Granted: 2016-09-06
- Earliest claimed: 2012-02-02
- Assignees: Lda, LLC
- Applicants: Franz Wiesbeck
- Inventors: Franz Wiesbeck
- Web page: https://patentgrep.com/patent/US9434790B2

## CPC

- C08B 37/006: {Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof}
- B01D 11/0219: {Fixed bed of solid material}
- C07D 311/40: Separation, e.g. from natural material; Purification
- C07D 311/62: with oxygen atoms directly attached in position 3, e.g. anthocyanidins
- C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## 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.

## Claims

### Claim 1

A process for the extraction of wood, comprising:
providing wood particles including at least a first class and a second class,
stacking a fine layer consisting of the first class wood particles on a further layer consisting of the second class wood particles, and
extracting the wood particles using a fluid extractant in which the extractant flows from top downwards initially through the fine layer and subsequently through the further layer,
wherein 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.

### Claim 2 (depends on 1)

The process according to claim 1, wherein a first median value of the particle size distribution of all the wood particles in the first class is lower than a second median value of the particle size distribution of all the wood particles in the second class, in which particularly the particle size is the nominal screen size.

### Claim 3 (depends on 2)

The process according to claim 2, wherein the first median value is less than or equal to 3 mm.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the provision of wood particles comprises:
comminuting wood into wood particles of various sizes, and
classifying, particularly screening the wood particles into at least the first class and the second class.

### Claim 5 (depends on 4)

The process according to claim 4, wherein a classification is made for the first class and the second class by using a mesh size or hole diameter between 0.5 mm and 7 mm.

### Claim 6 (depends on 1)

The process according to claim 1, wherein over 70% mass fraction of the wood particles in the first class has a nominal screen size of at most 4 mm.

### Claim 7 (depends on 1)

The process according to claim 1, wherein over 30% mass fraction of the wood particles in the second class has a nominal screen size of at least 2 mm.

### Claim 8 (depends on 1)

The process according to claim 1, wherein the nominal screen size of the wood particles of over 60% mass fraction of all the wood particles in the first class is less than or equal to a first limit value, and that the nominal screen size of the wood particles of over 10 mass fraction of all wood particles of the second class is greater than or equal to a second limit value, in which the first limit value is equal to or less than the second limit value.

### Claim 9 (depends on 8)

The process according to claim 8, wherein the first limit value has a nominal screen size of 4 mm.

### Claim 10 (depends on 1)

The process according to claim 1, wherein a layer height of the fine layer is 5% to 70% of a total height of all layers.

### Claim 11 (depends on 1)

The process according to claim 1, wherein the wood particles are stacked in a percolator, in which the height of the fine layer is at least 0.5 m.

### Claim 12 (depends on 1)

The process according to claim 1, wherein at least one of taxifolin is extracted from wood with ethanol as extractant or arabinogalactan is extracted from wood using water as extractant.