Abstract

The present disclosure provides a continuous or semi-continuous process for manufacturing of acid hydrolysed cellulose comprising the steps of: a) providing sheets or a web of cellulose fibres; b) applying oxalic acid and/or citric acid and/or maleic acid to the sheets or web; c) reacting the oxalic acid and/or citric acid and/or maleic acid applied in step b) at a temperature in the interval of 70-135 °C with cellulose of the sheets or web to form reacted sheets or a reacted web comprising acid hydrolysed cellulose; and d) cooling the reacted sheets or reacted web

IPC Classes  ?

• C08B 3/00 - Preparation of cellulose esters of organic acids
• C08B 15/02 - OxycelluloseHydrocelluloseCellulose hydrate
• C08B 15/08 - Fractionation of cellulose, e.g. separation of cellulose crystallites
• D21D 1/02 - Methods of beatingBeaters of the Hollander type
• D21D 1/20 - Methods of refining
• D21H 11/18 - Highly hydrated, swollen or fibrillatable fibres
• C08L 1/02 - CelluloseModified cellulose

Abstract

The present invention relates to a method for manufacturing hydrophobized nano- cellulose comprising the steps of: a) providing a cellulose-containing material wherein the cellulose-containing material contains less than 20 wt.% water, b) con- tacting the cellulose-containing material with oxalic acid dihydrate, and heating above the melting point of the oxalic acid dihydrate, to obtain cellulose oxalates, c) washing the mixture, d) preparing a suspension comprising the material from step c) and e) recovering hydrophobized nanocellulose from the suspension. The pre- sent invention relates also to a method of manufacturing hydrophobized nanocellu- lose intermediate which comprises the above described steps a)-c). The methods disclosed in the present invention are quick, inexpensive, simple, and direct. Pulp can be used as raw material.

IPC Classes  ?

• C08L 1/10 - Esters of organic acids
• C08L 1/14 - Mixed esters, e.g. cellulose acetate-butyrate
• C08B 3/12 - Preparation of cellulose esters of organic acids of polybasic organic acids
• C08B 3/16 - Preparation of mixed organic cellulose esters
• C08B 3/20 - Esterification with maintenance of the fibrous structure of the cellulose
• C08B 3/22 - Post-esterification treatments, including purification

Abstract

The present invention relates to a method for manufacturing nanocellulose comprising the steps of: a) providing a cellulose-containing material wherein the cellulose-containing material contains less than 20 wt.% water, b) contacting the cellulose-containing material with oxalic acid dihydrate, and heating above the melting point of the oxalic acid dihydrate, to obtain cellulose oxalates, c) washing the mixture, d) preparing a suspension comprising the washed material from step c) and e) recovering nanocellulose from the suspension. The present invention relates also to a method of manufacturing nanocellulose intermediate which comprises the above described steps a)-c). The methods disclosed in the present invention are quick, simple, and direct. Pulp can be used as raw material. A considerable amount of free carboxyl groups are introduced. A high yield can be obtained. The methods are inexpensive.

IPC Classes  ?

• C08B 15/08 - Fractionation of cellulose, e.g. separation of cellulose crystallites
• C08B 3/00 - Preparation of cellulose esters of organic acids
• C08B 15/02 - OxycelluloseHydrocelluloseCellulose hydrate
• C08L 1/04 - OxycelluloseHydrocellulose
• C08L 1/10 - Esters of organic acids
• D21C 9/00 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
• D21H 11/18 - Highly hydrated, swollen or fibrillatable fibres
• B29C 47/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C 49/04)