Process for supercritical or subcritical partial delignification and filling of a lignocellulosic material

A lignocellulose and delignification technology, applied in the field of modification of lignocellulosic materials, can solve the problems of expensive, slow implementation of wood composite materials, complex implementation, etc., and achieve the effect of performance improvement

Active Publication Date: 2020-02-21
SAS WOODOO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Therefore, the hitherto known methods for impregnating wood or any other lignocellulosic material to produce a material of greater strength are com

Method used

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  • Process for supercritical or subcritical partial delignification and filling of a lignocellulosic material
  • Process for supercritical or subcritical partial delignification and filling of a lignocellulosic material
  • Process for supercritical or subcritical partial delignification and filling of a lignocellulosic material

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Embodiment 1

[0292] Embodiment 1: According to the processing method of the present invention, wherein step (1) uses supercritical CO in the presence of a mixture of 50% water-50% ethanol (volume %) 2 Do it in static mode.

[0293] exist figure 2 In the device 6 of the present invention, in static mode, a structure of beech cross-cut dry wood with dimensions 17 mm x 17 mm x 9 mm (1 x L x h) was subjected to the treatment method according to the invention.

[0294] The extraction step (1) was carried out under the following conditions: pressure 1.76 MPa (17.6 bar), temperature 180° C., a certain amount of co-solvent 50% water-50% ethanol (vol %) and treatment duration 2 hours.

[0295] At the end of this extraction step (1), the high pressure unit (0.5 L) is depressurized and the wood pieces are recovered as well as the lignin-containing extract.

[0296] The filling step (2) and trimming step (3) of the structure of lignocellulosic material thus obtained is carried out by image 3 equi...

Embodiment 2

[0300] Embodiment 2: according to processing method of the present invention, wherein step (1) uses supercritical CO 2 It was performed in dynamic mode in the presence of a co-solvent mixture of 50% water-50% ethanol (% by volume).

[0301] In dynamic mode and in the presence of a water / ethanol co-solvent, a beech cross-cut dry wood of dimensions 200 mm x 90 mm x 18 mm (1 x L x h) was processed by a partial extraction step of the lignin according to the process of the invention. Structure (planks).

[0302] The extraction was carried out for 2 hours at a pressure of 2.02 MPa (202 bar) and a temperature of 118°C. pump the CO 2 and water / ethanol mixture were continuously introduced into the high pressure unit (2 L) at flow rates of 100 g / min and 5.34 g / min, respectively.

[0303] At the end of this extraction step (1), the high pressure unit is depressurized and the planks and lignin-containing extract are recovered.

[0304] The filling step (2) and trimming step (3) of the...

Embodiment 3

[0305] Embodiment 3: according to the processing method of the present invention, wherein step (1) is carried out by supercritical and enzymatic means

[0306] According to the present invention, under the conditions of a pressure of 20 MPa (200 bar), a temperature of 165 ° C and a duration of 3 h in static mode, with supercritical CO 2 Structure of pre-treated dry wood with dimensions 17mm x 17mm x 10mm.

[0307] The structure of the pretreated lignocellulosic material was then placed in a solution containing the enzyme (laccase) at a concentration of 5 g / L at a temperature of 50 °C, a duration of 48 h and stirring (100 trs / min). Adjust the pH of the enzyme solution using a buffer solution to maintain a value between 4.7 and 5.

[0308] Treated wood and extracts (which contain lignin) were recovered at the end of the enzyme treatment and dried in an oven to characterize them.

[0309] The filling step (2) and trimming step (3) of the structure of lignocellulosic material th...

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Abstract

The invention relates to a process for treating lignocellulosic material, preferably wood, comprising the following successive steps: (1) extraction of lignin by a fluid in supercritical or subcritical phase in order to extract from 40 to 85%, in % by weight, of the lignin from the initial material; (2) filling by a filling compound, preferably in the presence of a fluid in supercritical or subcritical phase.; and (3) finishing, so as to obtain a composite material formed of a three-dimensional network of filling compound converted and incorporated in a network of cellulose and of lignin.

Description

technical field [0001] The invention relates to a modification treatment method of lignocellulosic materials. In particular, the present invention relates to a method of partial delignification and filling of structures of lignocellulosic material. The lignocellulosic material is preferably wood. Any modified lignocellulosic material (referred to as a "composite") obtained by this method is such that its natural configuration is substantially and advantageously maintained. Background technique [0002] current technology [0003] It is known that certain mechanical properties of wood, such as compressive strength and flexural strength, can be improved by impregnating wood with at least one monomer and / or polymer. Such wood impregnated with monomers and / or polymers is often referred to as wood composites. It is usually surface impregnated solid wood, ie substantially impregnated over a small thickness from the surface (usually 4-6mm depth from the surface). [0004] One...

Claims

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Application Information

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IPC IPC(8): B27K5/00B05D7/06B27K3/08B27K3/15
CPCB27K5/008B27K3/086B27K3/15C08H6/00C08H8/00C08L97/005B27K3/0207B27K3/0292B27K3/346B27K5/065B27K2240/10Y02P20/54B27K3/08
Inventor 蒂莫泰·布瓦图泽特
Owner SAS WOODOO
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