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Method for providing a nanocellulose involving modifying cellulose fibers
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2009 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

The present invention provides a method for the manufacturing of nanocellulose. The method includes a first modification of the cellulose material, where the cellulose fibres are treated with an aqueous electrolyte-containing solution of an amphoteric cellulose derivative. The modification is followed by a mechanical treatment. By using this method for manufacturing nanocellulose, clogging of the mechanical apparatus is avoided. Also disclosed is nanocellulose manufactured in accordance with said method and uses of said cellulose.

Place, publisher, year, edition, pages
2009.
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-102939OAI: oai:DiVA.org:kth-102939DiVA: diva2:557649
Patent
AU 2009234498B2 (2014-01-09)
Note

RU 2519257 C2 (2014-06-10);  US 8911591 B2 (2014-12-16)

Available from: 2012-09-28 Created: 2012-09-28 Last updated: 2015-01-27Bibliographically approved
In thesis
1. Microfibrillated cellulose: Energy-efficient preparation techniques and key properties
Open this publication in new window or tab >>Microfibrillated cellulose: Energy-efficient preparation techniques and key properties
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This work describes three alternative processes for producing microfibrillated cellulose (MFC) in which pulp fibres are first pre-treated and then homogenized using a high-pressure homogenizer. In one process, fibre cell wall delamination was facilitated with a combined enzymatic and mechanical pre-treatment. In the two other processes, cell wall delamination was facilitated by pre-treatments that introduced anionically charged groups into the fibre wall, by means of either a carboxymethylation reaction or irreversibly attaching carboxymethyl cellulose (CMC) onto the fibres. All three processes are industrially feasible and enable production with low energy consumption. Using these methods, MFC can be produced with an energy consumption of 500–2300 kWh/tonne, which corresponds to a 91–98% reduction in energy consumption from that presented in earlier studies. These materials have been characterized in various ways and it has been demonstrated that the produced MFCs are approximately 5–30 nm wide and up to several microns long.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 49 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 38
Keyword
Microfibrillated cellulose, microfibrillar cellulose, nanofibrillated cellulose nanofibrillar cellulose, nanocellulose, MFC, NFC, production techniques, energy efficient, gel properties, films, enzymes, carboxymethylation, carboxymethyl cellulose, CMC, mechanical properties, oxygen barrier, homogenization
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-102949 (URN)978-91-7501-464-7 (ISBN)
Presentation
2012-10-17, STFI-salen, Innventia AB, Drottning Kristinas väg 61, KTH, Stockholm, 14:02 (Swedish)
Opponent
Supervisors
Note

QC 20120928

Available from: 2012-09-28 Created: 2012-09-28 Last updated: 2012-10-03Bibliographically approved
2. Microfibrillated cellulose: Energy-efficient preparation techniques and applications in paper
Open this publication in new window or tab >>Microfibrillated cellulose: Energy-efficient preparation techniques and applications in paper
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This work describes three alternative processes for producing microfibrillated cellulose (MFC; also referred to as cellulose nanofibrils, CNF) in which bleached pulp fibres are first pretreated and then homogenized using a high-pressure homogenizer. In one process, fibre cell wall delamination was facilitated by a combined enzymatic and mechanical pretreatment. In the two other processes, cell wall delamination was facilitated by pretreatments that introduced anionically charged groups into the fibre wall, by means of either a carboxymethylation reaction or irreversibly attaching carboxymethylcellulose (CMC) to the fibres. All three processes are industrially feasible and enable energy-efficient production of MFC. Using these processes, MFC can be produced with an energy consumption of 500–2300 kWh/tonne. These materials have been characterized in various ways and it has been demonstrated that the produced MFCs are approximately 5–30 nm wide and up to several microns long.

The MFCs were also evaluated in a number of applications in paper. The carboxymethylated MFC was used to prepare strong free-standing barrier films and to coat wood-containing papers to improve the surface strength and reduce the linting propensity of the papers. MFC, produced with an enzymatic pretreatment, was also produced at pilot scale and was studied in a pilot-scale paper making trial as a strength agent added at the wet-end for highly filled papers.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. 63 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:5
Keyword
Microfibrillated cellulose, microfibrillar cellulose, nanofibrillated cellulose, nanofibrillar cellulose, cellulose nanofibrils, nanocellulose, MFC, NFC, CNF, production techniques, energy efficient, gel properties, films, enzymes, carboxymethylation, carboxymethyl cellulose, CMC, mechanical properties, oxygen barrier, homogenization, linting, papermaking
National Category
Paper, Pulp and Fiber Technology
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-159222 (URN)978-91-7595-426-4 (ISBN)
Public defence
2015-02-27, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20150126

Available from: 2015-01-26 Created: 2015-01-26 Last updated: 2015-01-28Bibliographically approved

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