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Influence of acid hydrogen peroxide treatment on refining energy and TMP properties
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The potential of using acid hydrogen peroxide under Fenton conditions to lower the electrical energy consumed during the production of Black spruce (Picea mariana) thermomechanical pulp (TMP) was investigated. The chemical system, which consisted of ferrous sulphate, hydrogen peroxide and optionally an enhancer (3,4-dimethoxybenzyl alcohol, ethylenediaminetetraacetic acid or oxalic acid/sodium oxalate), was evaluated as an inter-stage treatment where the primary refiner was used as a mixer. The produced TMPs were thoroughly characterised in order to explain the effect of the chemical system on fibre development and to be able to propose a mechanism for the impact on refining energy reduction. The possibility to improve the optical properties by washing, chelating and sodium dithionite or hydrogen peroxide bleaching the treated pulps was evaluated.

 

The results obtained in a pilot plant trial show that it is possible to significantly reduce the comparative specific energy consumption by approximately 20% and 35% at a freeness value of 100 ml CSF or a tensile index of 45 Nm/g by using 1% and 2% hydrogen peroxide respectively. The energy reduction is obtained without any substantial change in the fractional composition of the pulp, though tear strength is slightly reduced, as are brightness and pulp yield. No major differences between the reference pulp and the chemically treated pulps were found with respect to fibre length, width or cross-sectional dimensions. However, the acid hydrogen peroxide-treated pulps tend to have more collapsed fibres, higher flexibility, a larger specific surface area and a lower coarseness value. The yield loss accompanying the treatment is mainly a consequence of degraded hemicelluloses. It was also found that the total charge of the chemically treated pulps is higher compared to the reference pulps, something that may have influenced the softening behaviour of the fibre wall.

 

A washing or chelating procedure can reduce the metal ion content of the chemically treated TMPs considerably. The amount of iron can be further reduced to a level similar to that of untreated pulps by performing a reducing agent-assisted chelating stage (QY) with dithionite. The discoloration cannot, however, be completely eliminated. The brightness decrease of the treated pulps is thus not only caused by higher iron content in the pulp, but is also dependent on the type of iron compound and/or other coloured compounds connected with the acid hydrogen peroxide treatment. Oxidative bleaching with hydrogen peroxide (P) is more effective than reductive bleaching with sodium dithionite in regaining the brightness lost during the energy reductive treatment. Using a QY P sequence, a hydrogen peroxide charge of 3.8% was needed to reach an ISO brightness of 75% for the chemically treated pulps. The corresponding hydrogen peroxide charge for the untreated TMP reference was 2.5%.

 

The radicals generated in the Fenton reaction will probably attack and weaken/soften the available outer fibre wall layers. This could facilitate fibre development and consequently lower the electrical energy demand for a certain degree of refinement.

Place, publisher, year, edition, pages
Sundsvall: FSCN - Fibre Science and Communication Network , 2009. , p. 69
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 37
Keywords [en]
TMP, Black Spruce, Energy reduction, Hydrogen peroxide, Ferrous sulphate, Refining, Inter-stage treatment, Pulp and paper properties, Fenton´s reagent, Bleaching, Sodium dithionite, Brightness, Metals, Fibre dimensions, Cross-sectional dimensions, Chemical composition
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:miun:diva-9207ISBN: 978-91-86073-40-4 (print)OAI: oai:DiVA.org:miun-9207DiVA, id: diva2:224959
Presentation
O102, Mittuniversitetet, Sundsvall (Swedish)
Opponent
Supervisors
Available from: 2009-06-24 Created: 2009-06-23 Last updated: 2009-11-18Bibliographically approved
List of papers
1. Energy efficient refining of Black spruce TMP by using acid hydrogen peroxide: Part 1. A pilot plant study
Open this publication in new window or tab >>Energy efficient refining of Black spruce TMP by using acid hydrogen peroxide: Part 1. A pilot plant study
2009 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 24, no 3, p. 255-265Article in journal (Refereed) Published
Abstract [en]

The potential of using acid hydrogen peroxide for lowering the

electrical energy consumption during production of Black spruce (Picea

mariana) thermomechanical pulp (TMP) was investigated. The chemical

system, which consisted of ferrous sulphate, hydrogen peroxide and

optionally an enhancer [ethylenediaminetetraacetic acid (sodium salt),

3,4-dimethoxybenzyl (veratryl) alcohol or oxalic acid/sodium oxalate],

was evaluated as an inter-stage treatment where the primary refiner was

used as a mixer. The approach has the advantage of minimising the

capital investment needed for implementation, thus being directly

applicable in a thermomechanical pulping process consisting of two or

more refiners in series.

The results obtained in a pilot plant trial revealed that is was

possible to significantly reduce the specific energy consumption by

approximately 20-and 35% to a freeness value of 100 ml CSF by using 1

and 2% hydrogen peroxide, respectively. The energy reduction could be

obtained without any substantial change in fibre length, fractional

composition of the pulp or tensile strength of the paper. The tear

strength was slightly reduced however, as was the pulp yield. The major

drawback with the acid hydrogen peroxide system was a reduction in

brightness by at least 6 brightness units. The addition level of

ferrous sulphate was too high and the possibility to reducing the

discoloration should be considerable when the chemical system is

optimized.

 

Place, publisher, year, edition, pages
Stockholm: SPCI, 2009
Keywords
TMP, Black spruce, Energy reduction, Hydrogen peroxide, Ferrous sulphate, Refining, Inter-stage treatment, Pulp and paper properties, Fenton’s reagent.
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8823 (URN)10.3183/NPPRJ-2009-24-03-p255-265 (DOI)000270862100001 ()2-s2.0-72749098172 (Scopus ID)
Projects
Mechanical Pulp Industrial Research College
Available from: 2009-04-29 Created: 2009-04-29 Last updated: 2017-12-13Bibliographically approved
2. Energy efficient refining of Black spruce TMP by using acid hydrogen peroxide: Part 2. Washing, chelating and bleaching studies
Open this publication in new window or tab >>Energy efficient refining of Black spruce TMP by using acid hydrogen peroxide: Part 2. Washing, chelating and bleaching studies
2009 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 24, no 3, p. 266-272Article in journal (Refereed) Published
Abstract [en]

The acid hydrogen peroxide system has the potential to significantly

reduce the specific energy consumption in the production of softwood

thermomechanical pulps (TMPs). A drawback of the chemical system is

discoloration of the pulp during refining. The work presented in this

study evaluates the possibility to regain the lost brightness by

washing, chelating and sodium dithionite or hydrogen peroxide bleaching

of the treated pulps.

A washing or chelating procedure can reduce the metal ion content of

the chemically treated TMPs considerably, though brightness can be

increased by a maximum of two ISO units. The amount of iron can be

further reduced to a level similar to that of untreated pulps by

performing a reducing agent-assisted chelating stage (Q(Y)) with

dithionite. The discoloration cannot,, however, be completely

eliminated. The brightness decrease-of the treated pulps is thus not

only caused by higher iron content in the pulp, but is also dependent

on the type of iron compound and/or other coloured compounds connected

with the acid hydrogen peroxide treatment.

Oxidative bleaching with hydrogen peroxide (P) is more effective than

reductive bleaching with sodium dithionite in regaining the brightness

lost during the energy reductive treatment. By using a Q(Y) P sequence,

a hydrogen peroxide charge of 3.8% was needed to reach an ISO

brightness of 75% for the chemically treated pulps. The corresponding

hydrogen peroxide charge for the untreated TMP reference was 2.5%.

 

Place, publisher, year, edition, pages
Stockholm: SPCI, 2009
Keywords
TMP, Black spruce, Energy reduction, Bleaching, Hydrogen peroxide, Sodium dithionite, Brightness, Metals
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8825 (URN)10.3183/NPPRJ-2009-24-03-p266-272 (DOI)000270862100002 ()2-s2.0-72749097945 (Scopus ID)
Projects
Mechanical Pulp Industrial Research College
Available from: 2009-04-29 Created: 2009-04-29 Last updated: 2017-12-13Bibliographically approved
3. Energy efficient refining of Black spruce TMP by using acid hydrogen peroxide: Part 3. Chemical and morphological characterisation
Open this publication in new window or tab >>Energy efficient refining of Black spruce TMP by using acid hydrogen peroxide: Part 3. Chemical and morphological characterisation
2010 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 36, no 1-2, p. 2-9Article in journal (Refereed) Published
Keywords
Thermomechanical pulp, Energy reduction, Hydrogen peroxide, Fibre dimensions, Cross-section, Chemical composition
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8826 (URN)
Projects
Mechanical Pulp Industrial Research College
Available from: 2009-04-29 Created: 2009-04-29 Last updated: 2017-12-13Bibliographically approved

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