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WOOD AND METHOD FOR PRODUCING WOOD NEW_EN meetings

Foreign code F190009975
File No. (170096JP01)
Posted date Oct 28, 2019
Country WIPO
International application number 2019JP007944
International publication number WO 2019168127
Date of international filing Feb 28, 2019
Date of international publication Sep 6, 2019
Priority data
  • P2018-035653 (Feb 28, 2018) JP
Title WOOD AND METHOD FOR PRODUCING WOOD NEW_EN meetings
Abstract The present invention removes lignin while maintaining the structure constituted of cellulose and hemicellulose. A raw wood material is immersed in a solution comprising an acid and an alcohol under the conditions of a temperature of 140-170°C and then immersed in a solution containing chlorous acid ions or hypochlorous acid ions.
Outline of related art and contending technology BACKGROUND ART
Wood building materials, furniture, as the raw material of paper and the acoustic material is widely used. In addition, such as bioethanol production from the viewpoint of the biorefinery woody biomass is used. Among them, in view of the case of utilizing the biorefinery wood, wood lignin is a component of is removed, milling to extract cellulose and cellulose. For removal of the lignin generally referred to as the pre-processing. It is assumed that the cell wall to various preprocessing techniques to break has been reported.
As the pre-processing method for removal of the lignin, vapor blasting treatment, an acid treatment and alkaline treatment such as the physico-chemical technique represented by, using a microorganism or lignin degrading enzyme lignin decomposition and a biological method. Also, in addition to these up to now, as a pretreatment method, for example, physical milling, cooking, ozone oxidation, such as γ-ray irradiation has been studied.
Moreover, acetic acid, ethanol, a high boiling alcohol, and phenol with an organic solvent is referred to as a solvolysis heat treatment at a high, effective to remove the lignin known as pre-processing method. Ind Eng Chem Res,49 (4), 1467-1472,2010a Hallac et al. is, a kind of milled wood utsugi, a mixed solvent of ethanol and 195°C of sulfuric acid, by treatment 1, the percent by weight of lignin found that the condition in which the digits are 1. Further, in Hallac et al. Biotechnol Bioeng,107,795-801,2010b, before tissue of the sample after processing was observed, the intercellular layer (the layer between the cells and cell) of lignin is preferentially removed to reveal. From the above results, and pre-processing described Hallac et al. Biotechnol Bioeng,107,795-801,2010b Hallac et al.Ind Eng Chem Res,49 (4), 1467-1472,2010a the method, at the same time to remove the lignin to facilitate isolation between the cells of the pulp to be concluded that the effect is high.
On the other hand, Japanese Patent Laid-Open Patent Application 2006-001270, the chips of cedar soap-water and immersed in a mixture of soda ash, hydrogen peroxide water to remove the lignin processing to produce wood chips has been disclosed. Japanese Patent Laid-Open Patent Application 2015-080759, the lignocellulosic , heating the ethylene glycol solution and the solid-liquid separation and extraction processing stage, the liquid component including the lignin and cellulose-containing solid component can be separated are disclosed. Patent Application JP-2012-111849, wood flour obtained by pulverizing wood chips for the degreasing treatment, delignification treatment, the milling processing to de cellulose, after bleaching treatment, is subjected to treatment with cellulase system is performed, thereafter, fine processing is executed in a method of producing fine fibrous cellulose has been disclosed. In particular, delignification treatment as an example of the use of acetic acid and sodium chlorite Wise method is disclosed. In addition, the wood vol.50,No.3,pl32-138 (2010) Society, 3.8-4.0 pH acid was added and the solution of sodium chlorite is delignification treatment using the disclosed.
As described above, the lignocellulosic material such as wood to the delignification in a variety of ways according to the method has been known. However, the above-described conventional method, the lignin, cellulose and cellulose to a technique for separating the milling, the tissue or cells of the wood and break, before the processing has not been possible to maintain the shape. In addition, JP-2006-001270 discloses a honeycomb structure of the wood chips to maintain the disclosed method of removing of the lignin, a wood chip itself can not maintain the shape of the processing.
As described above, to reliably remove the lignin while far, cellulose and cellulose milling to maintain a structure composed of a technique has not been known. Therefore, the present invention, in view of the circumstances described above, as the wood is reduced while maintaining the structure of the wood lignin, cellulose and cellulose to milling while maintaining a structure composed of a method of removing the lignin, the method can be applied to the wood and wood lignin is reduced to provide a manufacturing method of the object.
Scope of claims (In Japanese)[請求項1]
 リグニン含有量が3重量%未満であり、セルロース含有量が75重量%以上である、木材。

[請求項2]
 前記セルロースの粘度平均重合度DPvが、300以上である、請求項1に記載の木材。

[請求項3]
 ヘミセルロース含有量が0.01重量%以上15重量%以下である、請求項1または2に記載の木材。

[請求項4]
 木質原材料を140℃以上170℃以下の条件下で酸とアルコールとを含有する溶液中に浸漬する第1の工程と、その後、木質原材料を亜塩素酸イオンまたは次亜塩素酸イオンを含む溶液に浸漬する第2の工程とを経て作製され、リグニン成分が低減された木材。

[請求項5]
 上記木質原材料の形状を維持したことを特徴とする請求項4記載の木材。

[請求項6]
 リグニン成分が検出限界以下に低減されたことを特徴とする請求項4または5記載の木材。

[請求項7]
 白色であることを特徴とする請求項4~6のいずれか1項に記載の木材。

[請求項8]
 木質原材料を140℃以上170℃以下の条件下で酸とアルコールとを含有する溶液中に浸漬する第1の工程と、その後、木質原材料を亜塩素酸イオンまたは次亜塩素酸イオンを含む溶液に浸漬する第2の工程とを含む、リグニン成分が低減された木材の製造方法。

[請求項9]
 上記アルコールは、150℃以上の沸点を有するアルコールであることを特徴とする請求項8記載の木材の製造方法。

[請求項10]
 上記酸とアルコールとを含有する溶液は、硫酸とエチレングリコールとを含有する溶液または硫酸とプロピレングリコールとを含有する溶液であることを特徴とする請求項8または9記載の木材の製造方法。

[請求項11]
 上記酸とアルコールとを含有する溶液は、アルコール濃度を90~99.5重量%とし、酸濃度を0.05~10重量%とすることを特徴とする請求項8~10のいずれか1項に記載の木材の製造方法。

[請求項12]
 上記第1の工程では、上記木質原材料を上記溶液に浸漬させた状態で密閉し、密閉空間内を脱気することを特徴とする請求項8~11のいずれか1項に記載の木材の製造方法。

[請求項13]
 上記亜塩素酸イオンまたは次亜塩素酸イオンを含む溶液は、亜塩素酸ナトリウム溶液または次亜塩素酸ナトリウム溶液であることを特徴とする請求項8~12のいずれか1項に記載の木材の製造方法。

[請求項14]
 上記亜塩素酸イオンまたは次亜塩素酸イオンを含む溶液は、亜塩素酸イオンまたは次亜塩素酸イオン濃度を0.01~10重量%とする溶液であることを特徴とする請求項8~13のいずれか1項に記載の木材の製造方法。

[請求項15]
上記第2の工程を複数回繰り返すことを特徴とする請求項8~14のいずれか1項に記載の木材の製造方法。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY
  • NIPPON SHOKUBAI CO., LTD.
  • Inventor
  • HORIKAWA, Yoshiki
  • TSUSHIMA, Rino
  • KUREI, Tatsuki
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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