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Oxidation of Kraft Pulp Fibres - Hydrogen Peroxide Oxidation Under Acidic Conditions and Its Influence on the Properties of Pulp.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Oxidation of Kraft Pulp Fibres - Hydrogen Peroxide Oxidation Under Acidic Conditions and Its Influence on the Properties of Pulp./
Author:	Martinsson, Axel.
Description:	1 online resource (75 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
Subject:	Chemical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9798835546824

Oxidation of Kraft Pulp Fibres - Hydrogen Peroxide Oxidation Under Acidic Conditions and Its Influence on the Properties of Pulp.
Martinsson, Axel.

Oxidation of Kraft Pulp Fibres - Hydrogen Peroxide Oxidation Under Acidic Conditions and Its Influence on the Properties of Pulp. - 1 online resource (75 pages)

Source: Dissertations Abstracts International, Volume: 84-01, Section: B.

Thesis (Ph.D.)--Chalmers Tekniska Hogskola (Sweden), 2022.

Includes bibliographical references

An increase in the use of bio-based products, combined with a decrease in the use of fossil-based products, is important for fulfilling the demands of a growing population in a sustainable manner. Moreover, reducing the usage of single-use plastics is vital in combating the plastic pollution that is afflicting our environment. A partial solution to these problems is to replace plastic products with products based on cellulose fibres. Their hydrophilic nature, however, makes utilization of fibre-based materials difficult under wet or moist conditions: the hydrogen bonds that contribute to the majority of the material's strength are broken in wet conditions. The wet strength can be increased through the addition of wet strength agents or mechanical treatments or, alternatively, the carbohydrate fraction of the fibres may be modified to improve their wet strength. One such modification is to introduce carbonyl groups in the carbohydrate fraction through oxidation, which would improve the wet strength by forming inter-fibre hemiacetal bonds. Methods often used on a laboratory scale to introduce carbonyl groups in the carbohydrate structure may, however, have economical or environmental drawbacks. In a kraft pulp mill producing bleached pulps, oxidative chemistry is typically utilized in the bleaching step in which the processes are optimized to remove residual lignin and chromophoric groups. Optimizing the oxidation operation to introduce carbonyl groups to the carbohydrate structure has the potential of producing a kraft pulp with inherent wet strength using the existing infrastructure of the mill, e.g., in the final bleaching step.The main aim of this work was to investigate the feasibility of using a common bleaching agent, namely hydrogen peroxide, to introduce carbonyl groups into the carbohydrate fraction of kraft pulp. It was found that oxidations carried out under mildly acidic conditions (pH 4, 85 °C) could increase the carbonyl content by a factor of about 4 at a residence time of 90 minutes. Also, the content of transition metal ions in the liquid phase requires to be controlled, which is important in industrial applications where the liquid fraction is recirculated. Oxidation was found to be successful in increasing the wet-web tensile strength (+ 6-23%) and wet tensile strength (+ 134-242%), with a slight reduction (- 4-11%) occurring in the dry tensile strength.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798835546824Subjects--Topical Terms:

555952
Chemical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Oxidation of Kraft Pulp Fibres - Hydrogen Peroxide Oxidation Under Acidic Conditions and Its Influence on the Properties of Pulp.
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100 1 $a Martinsson, Axel. $3 1475739
245 1 0 $a Oxidation of Kraft Pulp Fibres - Hydrogen Peroxide Oxidation Under Acidic Conditions and Its Influence on the Properties of Pulp.
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300 $a 1 online resource (75 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
500 $a Advisor: Hasani, Merima.
502 $a Thesis (Ph.D.)--Chalmers Tekniska Hogskola (Sweden), 2022.
504 $a Includes bibliographical references
520 $a An increase in the use of bio-based products, combined with a decrease in the use of fossil-based products, is important for fulfilling the demands of a growing population in a sustainable manner. Moreover, reducing the usage of single-use plastics is vital in combating the plastic pollution that is afflicting our environment. A partial solution to these problems is to replace plastic products with products based on cellulose fibres. Their hydrophilic nature, however, makes utilization of fibre-based materials difficult under wet or moist conditions: the hydrogen bonds that contribute to the majority of the material's strength are broken in wet conditions. The wet strength can be increased through the addition of wet strength agents or mechanical treatments or, alternatively, the carbohydrate fraction of the fibres may be modified to improve their wet strength. One such modification is to introduce carbonyl groups in the carbohydrate fraction through oxidation, which would improve the wet strength by forming inter-fibre hemiacetal bonds. Methods often used on a laboratory scale to introduce carbonyl groups in the carbohydrate structure may, however, have economical or environmental drawbacks. In a kraft pulp mill producing bleached pulps, oxidative chemistry is typically utilized in the bleaching step in which the processes are optimized to remove residual lignin and chromophoric groups. Optimizing the oxidation operation to introduce carbonyl groups to the carbohydrate structure has the potential of producing a kraft pulp with inherent wet strength using the existing infrastructure of the mill, e.g., in the final bleaching step.The main aim of this work was to investigate the feasibility of using a common bleaching agent, namely hydrogen peroxide, to introduce carbonyl groups into the carbohydrate fraction of kraft pulp. It was found that oxidations carried out under mildly acidic conditions (pH 4, 85 °C) could increase the carbonyl content by a factor of about 4 at a residence time of 90 minutes. Also, the content of transition metal ions in the liquid phase requires to be controlled, which is important in industrial applications where the liquid fraction is recirculated. Oxidation was found to be successful in increasing the wet-web tensile strength (+ 6-23%) and wet tensile strength (+ 134-242%), with a slight reduction (- 4-11%) occurring in the dry tensile strength.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Chemical engineering. $3 555952
650 4 $a Bioengineering. $3 598252
650 4 $a Moisture content. $3 1465271
650 4 $a Plastic pollution. $3 1475740
650 4 $a Hydrogen peroxide. $3 902840
650 4 $a Chlorine. $3 1466018
650 4 $a Alcohol. $3 654366
650 4 $a Decomposition. $3 1372547
650 4 $a Adsorption. $3 867181
650 4 $a Hydrochloric acid. $3 1475158
650 4 $a Carbohydrates. $3 562719
650 4 $a Carbon. $3 557161
650 4 $a Sodium. $3 1437786
650 4 $a Cellulose. $3 678568
650 4 $a Fourier transforms. $3 1372561
650 4 $a Hydrogen bonds. $3 894261
650 4 $a Oxidation. $3 902839
650 4 $a Lignin. $3 847953
650 4 $a Tensile strength. $3 1215672
650 4 $a Chloride. $3 1372665
655 7 $a Electronic books. $2 local $3 554714
690 $a 0202
690 $a 0542
710 2 $a Chalmers Tekniska Hogskola (Sweden). $3 1372792
710 2 $a ProQuest Information and Learning Co. $3 1178819
773 0 $t Dissertations Abstracts International $g 84-01B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29177707 $z click for full text (PQDT)