# US 2018/0022832 A1 · Method for producing polysaccharide derivative and lignin derivative > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022832 A1 - Document ID: US20180022832A1 - Status: Published application - Kind: A1 - Application number: 15/521,200 - Filed: 2015-10-23 - Published: 2018-01-25 - Earliest claimed: 2014-10-27 - Assignees: National University Corporation Kanazawa University; Kanazawa Institute of Technology - Applicants: National University Corporation Kanazawa University; Kanazawa Institute of Technology - Inventors: Ryohei KAKUCHI; Kazuaki NINOMIYA; Yoshiki SHIBATA; Kiyoshi UZAWA; Tomoki OGOSHI; Katsuhiro MAEDA; Tomoyuki IKAI; Kenji TAKAHASHI - Web page: https://patentgrep.com/patent/US20180022832A1 ## CPC - C08B 3/06: Cellulose acetate {, e.g. mono-acetate, di-acetate or tri-acetate} - C07G 1/00: Low-molecular-weight derivatives of lignin (high-molecular-weight derivatives of lignin {C08H6/00}) - C08B 3/00: Preparation of cellulose esters of organic acids {(rendering cellulose suitable for esterification C08B1/02)} - C08B 3/18: Aceto-butyrates - C08B 11/00: Preparation of cellulose ethers {(rendering cellulose suitable for etherification C08B1/06)} - C08B 11/02: Alkyl or cycloalkyl ethers - C08H 6/00: {Macromolecular compounds derived from lignin, e.g. tannins, humic acids} - C08L 97/005: {Lignin} - C08L 97/02: Lignocellulosic material, e.g. wood, straw or bagasse {(manufacture of articles made from lignocellulosic material by dry processes B27N)} - Y02P 20/54: using solvents, e.g. supercritical solvents or ionic liquids - 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) - C07G: COMPOUNDS OF UNKNOWN CONSTITUTION (sulfonated fats, oils or waxes of undetermined constitution C07C309/62) - C08H: DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS (polysaccharides C08B; natural rubber C08C; natural resins or their derivatives C09F; bituminous materials C10) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract An object is to provide a method for producing a polysaccharide derivative without using a catalyst, a cocatalyst, or an active compound by esterification, etherification, or the like, from a polysaccharide such as cellulose as a source material, while maintaining a high molecular weight. Another object is to provide a method for producing a cellulose derivative in a separated condition directly from biomass containing lignocellulose. A method for producing a polysaccharide derivative of the present invention is characterized in that a reaction is carried out in a mixture comprising: a source material comprising a polysaccharide; an ionic liquid for which the pKa of a conjugate acid of an anion in DMSO is 12 to 19 and which is capable of producing a carbene; and a chain or cyclic ester compound or an epoxy compound. Preferably as a source material containing a polysaccharide, a biomass source material containing lignocellulose is used. ## Claims ### Claim 1 A method for producing a cellulose derivative, wherein a reaction is carried out without particularly using a catalyst in a mixture comprising: a biomass source material comprising cellulose as lignocellulose; an ionic liquid in which a cation is represented by the following Formula (1): wherein, R1 and R2 each independently are an alkyl group, an alkenyl group, an alkoxyalkyl group, or a substituted or unsubstituted phenyl group, and R3 to R5 each independently are hydrogen, an alkenyl group, an alkoxyalkyl group, or a substituted or unsubstituted phenyl group, for which the pKa of a conjugate acid of an anion in DMSO is 12 to 19 and which is capable of producing a carbene; and a chain or cyclic ester compound. ### Claim 2 (canceled) ### Claim 3 (depends on 1) The method for producing a cellulose derivative according to claim 1, wherein a cellulose derivative is produced in a condition separated from a lignin. ### Claim 4 (depends on 3) The method for producing a cellulose derivative according to claim 3, wherein the cellulose derivative is produced, and also a lignin derivative is produced. ### Claim 5 (depends on 1) The method for producing a cellulose derivative according to claim 1, wherein the ionic liquid is included in the mixture as a cosolvent system with an organic solvent. ### Claim 6 (depends on 1) The method for producing a cellulose derivative according to claim 1, wherein the weight of the ionic liquid is two times or more of the weight of the cellulose. ### Claim 7 (depends on 1) The method for producing a cellulose derivative according to claim 1, wherein 2 or more chain or cyclic ester compounds are included in the mixture. ### Claim 8 (depends on 1) The method for producing a cellulose derivative according to claim 1, wherein the chain ester compound is a carboxylate ester selected from the group consisting of isopropenyl carboxylate, vinyl carboxylate, and methyl carboxylate. ### Claim 9 (canceled) ### Claim 10 (depends on 1) The method for producing a cellulose derivative according to claim 1, wherein an anion of the ionic liquid is a carboxylate anion. ### Claim 11 A method for producing a lignin derivative, wherein a reaction is carried out without particularly using a catalyst in a mixture comprising: a source material comprising a lignin; an ionic liquid in which a cation is represented by the following Formula (1): wherein, R1 and R2 each independently are an alkyl group, an alkenyl group, an alkoxyalkyl group, or a substituted or unsubstituted phenyl group, and R3 to R5 each independently are hydrogen, an alkenyl group, an alkoxyalkyl group, or a substituted or unsubstituted phenyl group, for which the pKa of a conjugate acid of an anion in DMSO is 12 to 19 and which is capable of producing a carbene; and a chain or cyclic ester compound. ### Claim 12 (depends on 11) The method for producing a lignin derivative according to claim 11, wherein 2 or more chain or cyclic ester compounds are included in the mixture. ### Claim 13 (depends on 11) The method for producing a lignin derivative according to claim 11, wherein the chain ester compound is a carboxylate ester selected from the group consisting of isopropenyl carboxylate, vinyl carboxylate, and methyl carboxylate. ### Claim 14 (canceled) ### Claim 15 (depends on 11) The method for producing a lignin derivative according to claim 11, wherein an anion of the ionic liquid is a carboxylate anion.