10 results about "Monolignol" patented technology

The invention relates to a method for isolating of a substituted guaiacol and / or a substituted syringol of formula (I) from a mixture containing lignin fragments, wherein R1 is hydrogen or —OCH3; R2 is a linear or branched C1-C4 alkyl or a linear or branched C1-C4 hydroxyalkyl; R3 is hydrogen or Na; comprising at least the steps of: a) Providing a mixture containing lignin fragments; b) Separation of the mixture of step a) into a lignin oligomer enriched fraction and a lignin monomer enriched fraction; c) Separating a solution comprising the compound according to formula (I) by fraction distillation, wherein R3 is hydrogen, from the lignin monomer enriched fraction of step b); d) Adding an aqueous NaOH solution having a pH of 11 or more to the solution of step c) comprising compound according to formula (I), wherein R3 is a cation; e) Isolating of the precipitated compound of step d); optionally followed by; f) Dissolve the isolated compound of step e) in water and lowering the pH of the aqueous solution to a value below pH using an acid; g) Isolation of a compound according to formula (I), wherein R3 is hydrogen, from the solution of step f).

A method for converting a lignin-derived material into at least one esterified lignin derivative, the method including the steps of: providing the lignin-derived material selected from the group of lignin monomers, lignin depolymerization products, and combinations thereof; adding a strong acid such as, sulfuric acid; providing an amount of peroxide component in quantity sufficient to obtain up to a 1:1 mole ratio with the strong acid; adding the peroxide component to the lignin-derived material and the strong acid to allow an oxidation reaction to take place for a pre-determined period of time sufficient to yield a composition comprising a pre-treated lignin-derived material; wherein the pre-treated lignin-derived material comprises at least one oxidized specie; and performing an esterification reaction on the composition comprising a pre-treated lignin-derived material, the esterification reaction including the steps of: providing an acidic composition having a pH of less than 1, the acidic composition including an acid selected from sulfuric acid, an alkylsulfonic acid, and an arylsulfonic acid, and an alcohol selected from C1-C8 linear alcohol and C3-C8 branched alcohol and mixtures thereof; combining the pre-treated lignin-derived material with the acidic composition into an esterification reaction mixture; heating up the esterification reaction mixture to a temperature ranging from 25° C. to 120° C.; and allowing sufficient time for an esterification reaction to occur to yield an esterified composition comprising the at least one esterified lignin derivative; wherein the esterified composition has an average molecular weight of less than 4000, as determined by gel permeation chromatography.

A method of condensing a lignin-derived material and converting at least a portion thereof into at least one esterified lignin derivative, said method comprising the steps of: - providing said lignin-derived material present in a LHDO composition, wherein said lignin-derived material is selected from the group consisting of: lignin monomers; lignin depolymerization products; and combinations thereof; - adjusting the LHDO composition to a pH less than 1; - heating said LHDO composition for a period of time sufficient to yield a heat-treated LHDO comprising at least one condensed aromatic structure; wherein said heat-treated LHDO has a higher molecular weight average than said LHDO composition; - performing an esterification reaction on said heat-treated LHDO, said esterification reaction comprising the following steps: o providing an acidic composition having a pH of less than 1, said acidic composition comprising: ▪ an acid selected from the group consisting of: sulfuric acid; an alkylsulfonic acid; and an arylsulfonic acid; and ▪ an alcohol selected from the group consisting of: C1-C8 linear alcohol and C3-C8 branched alcohol and mixtures thereof; o combining said heat-treated LHDO with said acidic composition into an esterification reaction mixture; o heating up said esterification mixture to a temperature ranging from 25oC to 120oC to convert at least some of said lignin-derived material and / or said at least one condensed aromatic structure present in said heat-treated LHDO into said at least one esterified lignin derivative.

In general the present invention relates to thermoplastic polyurethanes containing lignin-derived monomers, lignin model compounds or the products of their respective functionalization in their structure. More specifically, this process relates to the use of 4-hydroxylalkylphenols and their derivatives as lignin-derived monomers or lignin model compounds. These can act either as chain extenders or be part of the polyol. The thermoplastic polyurethanes can be partially or fully bio-based. Furthermore, the invention relates to a method for preparing these thermoplastic polyurethanes and to their use.

A method of condensing a lignin-derived material and converting at least a portion thereof into at least one esterified lignin derivative, the method including the steps of: providing the lignin-derived material present in a LHDO composition, wherein the lignin-derived material is selected from the group consisting of: lignin monomers; lignin depolymerization products; and combinations thereof; adjusting the LHDO composition to a pH less than 1; heating the LHDO composition for a period of time sufficient to yield a heat-treated LHDO comprising at least one condensed aromatic structure; wherein the heat-treated LHDO has a higher molecular weight average than the LHDO composition; performing an esterification reaction on the heat-treated LHDO, the esterification reaction including the steps of: providing an acidic composition having a pH of less than 1, the acidic composition including an acid selected from sulfuric acid, an alkylsulfonic acid, and an arylsulfonic acid, and an alcohol selected from the group consisting of: C1-C8 linear alcohol and C3-C8 branched alcohol and mixtures thereof; combining the heat-treated LHDO with the acidic composition into an esterification reaction mixture; and heating up the esterification mixture to a temperature ranging from 25° C. to 120° C. to convert at least some of the lignin-derived material and / or the at least one condensed aromatic structure present in the heat-treated LHDO into the at least one esterified lignin derivative.

The invention belongs to the technical field of lignin-based adhesives, and particularly relates to a multi-weather-resistance lignin monomer-based adhesive and a preparation method thereof. The invention provides a strategy for preparing a high-performance bionic adhesive through depolymerization-derivation-copolymerization, which comprises the following steps: firstly, carrying out reduction catalytic degradation on wood G / S-lignin and plant shell C-lignin to respectively obtain monophenol compounds with specific structures, and then carrying out functional modification on the monophenol compounds to construct a monomer C and a monomer G with polymerizable activity; finally, the adhesive with excellent performance is prepared through a free radical copolymerization reaction, the adhesive shows excellent adhesion performance in humid, extremely cold and other environments, the underwater adhesion of the adhesive can reach 8.7 MPa, the adhesive strength of 7.2 MPa or above can still be kept under the ultralow temperature condition of-196 DEG C, and the adhesive strength can still reach 6 MPa after seawater and liquid nitrogen circulation treatment. The prepared adhesive is wide in raw material source, low in cost, excellent in weather resistance and high in industrial production value.

To provide a novel material.SOLUTION: A material 3 formed by bonding together a plurality of cultured plant cells 1 in which cell walls have been grown using monolignol.SELECTED DRAWING: Figure 1

A method for converting a lignin-derived material into at least one esterified lignin derivative, said method comprising the steps of: - providing said lignin-derived material selected from the group consisting of: lignin monomers; lignin depolymerization products; and combinations thereof; - adding a strong acid such as, sulfuric acid; - providing an amount of peroxide component in quantity sufficient to obtain up to a 1:1 mole ratio with said strong acid; - adding said peroxide component to said lignin-derived material and said strong acid to allow an oxidation reaction to take place for a pre-determined period of time sufficient to yield a composition comprising a pre-treated lignin-derived material; wherein said pre-treated lignin-derived material comprises at least one oxidized specie; - performing an esterification reaction on said composition comprising a pre-treated lignin-derived material, said esterification reaction comprising the following steps: o providing an acidic composition having a pH of less than 1, said acidic composition comprising: ▪ an acid selected from the group consisting of: sulfuric acid; an alkylsulfonic acid; and an arylsulfonic acid; and ▪ an alcohol selected from the group consisting of: C1-C8 linear alcohol and C3-C8 branched alcohol and mixtures thereof; o combining said pre-treated lignin-derived material with said acidic composition into an esterification reaction mixture; o heating up said esterification reaction mixture to a temperature ranging from 25oC to 120oC; and o allowing sufficient time for an esterification reaction to occur to yield an esterified composition comprising said at least one esterified lignin derivative; wherein said esterified composition has an average molecular weight of less than 4000, as determined by gel permeation chromatography.

A method of condensing a lignin-derived material and converting at least a portion thereof into at least one esterified lignin derivative, said method comprising the steps of: - providing said lignin-derived material present in a LHDO composition, wherein said lignin-derived material is selected from the group consisting of: lignin monomers; lignin depolymerization products; and combinations thereof; - adjusting the LHDO composition to a pH less than 1; - heating said LHDO composition for a period of time sufficient to yield a heat-treated LHDO comprising at least one condensed aromatic structure; wherein said heat-treated LHDO has a higher molecular weight average than said LHDO composition; - performing an esterification reaction on said heat-treated LHDO, said esterification reaction comprising the following steps: o providing an acidic composition having a pH of less than 1, said acidic composition comprising: ▪ an acid selected from the group consisting of: sulfuric acid; an alkylsulfonic acid; and an arylsulfonic acid; and ▪ an alcohol selected from the group consisting of: C1-C8 linear alcohol and C3-C8 branched alcohol and mixtures thereof; o combining said heat-treated LHDO with said acidic composition into an esterification reaction mixture; o heating up said esterification mixture to a temperature ranging from 25oC to 120oC to convert at least some of said lignin-derived material and / or said at least one condensed aromatic structure present in said heat-treated LHDO into said at least one esterified lignin derivative.

The present application mainly aims to provide a method for preparing 1,4-cyclohexanediol from lignocellulose, which comprises the following steps: lignocellulose raw materials and a first solvent are mixed and added into a high-pressure reaction kettle to perform a first reaction, and a first product is obtained through separation and purification; the first product is placed in a second solvent, hydrogen peroxide and sodium hydroxide solution are added and stirred to perform a second reaction; a second product is mixed with a third solvent and a first catalyst to perform a third reaction under the condition of no external hydrogen to obtain 1,4-cyclohexanediol. The yield of lignin monomers in the first step can reach 9.2-21.1 wt%, the conversion rate of the oxidation reaction of hydroxybenzaldehyde compounds in the second step reaches 90%, and the yield of 1,4-cyclohexanediol in the third step can reach 80%. In the catalytic system used in the present application, a commercially available base metal catalyst is used, and no external hydrogen source is required during the reaction process, the product yield is high, and a green and sustainable method for producing 1,4-cyclohexanediol is provided.