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Oxidation of Kraft Pulp Fibres - Hyd...

Martinsson, Axel.

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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:	Electronic resources : 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.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
Description:	75 p.
Notes:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
Subject:	Chloride. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29177707
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. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 75 p.

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

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

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.

ISBN: 9798835546824Subjects--Topical Terms:

3681736
Chloride.

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 75 p.
500 $a Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
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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.
590 $a School code: 0419.
650 4 $a Chloride. $3 3681736
650 4 $a Tensile strength. $3 3564816
650 4 $a Lignin. $3 1097216
650 4 $a Oxidation. $3 714629
650 4 $a Hydrogen bonds. $3 768332
650 4 $a Fourier transforms. $3 3545926
650 4 $a Cellulose. $3 588995
650 4 $a Sodium. $3 3562677
650 4 $a Carbon. $3 604057
650 4 $a Carbohydrates. $3 522687
650 4 $a Hydrochloric acid. $3 3681864
650 4 $a Adsorption. $3 580046
650 4 $a Decomposition. $3 3561186
650 4 $a Alcohol. $3 872287
650 4 $a Chlorine. $3 3566265
650 4 $a Hydrogen peroxide. $3 1534649
650 4 $a Plastic pollution. $3 3685360
650 4 $a Moisture content. $3 3564813
650 4 $a Bioengineering. $3 657580
650 4 $a Chemical engineering. $3 560457
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