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REMOVAL OF LIPOPHILIC EXTRACTIVES AND MANGANESE IONS FROM SPRUCE TMP WATER BY FLOTATION
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design. (FSCN / Water Chemisty)ORCID iD: 0000-0002-0770-2086
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Dissolved and Colloidal substances (DisCo) and metals are released from wood during thermomechanical pulp (TMP) production. The mechanical treatment causes that these components have a tendency to accumulate in process waters, as the water circulation systems in integrated paper mills are being closed. Disturbances such as pitch depositions on the paper machine (pitch problems), specks in the paper, decreased wet and dry strength, interference with cationic process chemicals, and impaired sheet brightness and friction properties appear in the presence of DisCo substances. The presence of transition metal ions such as manganese results in higher consumption of bleaching chemicals (hydrogen peroxide) and lowers the optical quality of the final product, and addition of complexing agents, such as EDTA or DTPA, to prevent this is needed. The never ending trends to decrease water consumption and increase process efficiency in pulp and paper production stress that it is very important both to know the effects of wood substances on pulping and papermaking and to be able to remove them in an efficient way.

Carried out investigations presented in this thesis show that the lipophilic extractives can be removed from TMP press water to high extent. A 90% decrease in turbidity and a 91% removal of lipophilic extractives from TMP press water can be obtained by addition of a cationic surfactant as foaming agent during flotation. Additionally, fibres located in TMP press water are not removed with the foam fraction but purified. A retained concentration of hydrophilic extractives in the process water indicates that the flotation is selective. Moreover, by introduction of a new recoverable surface active complexing agent, a chelating surfactant, manganese ions in the form of chelates can be successfully removed from the pulp fibres and separated from the process water in the same flotation process.

iii

The findings presented above indicate new possibilities for internal water cleaning and decreased emissions to water if flotation technology is applied in an integrated mechanical pulp mill.

Place, publisher, year, edition, pages
Sundsvall: Mittuniversitet , 2012. , 50 p.
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 74
Keyword [en]
Flotation, Foaming agents, Chelating surfactant, TMP process water, Pitch control, Internal cleaning stage
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:miun:diva-16088ISBN: 978-91-87103-01-8 (print)OAI: oai:DiVA.org:miun-16088DiVA: diva2:515990
Presentation
2012-03-01, sal O102, Mid Sweden University, Sundsvall, 10:15 (English)
Opponent
Supervisors
Projects
ReGain/FORE
Available from: 2012-04-17 Created: 2012-04-17 Last updated: 2014-06-27Bibliographically approved
List of papers
1. Brightness development of a hydrogen peroxide bleached spruce TMP. Comparisons of pre-treatments with DTPA and a separable chelating surfactant
Open this publication in new window or tab >>Brightness development of a hydrogen peroxide bleached spruce TMP. Comparisons of pre-treatments with DTPA and a separable chelating surfactant
Show others...
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 1, 50-55 p.Article in journal (Refereed) Published
Abstract [en]

In this investigation a new type of recoverable complexing agent (chelating surfactant) has been compared with a conventional complexing agent; diethylenetriamine pentaacetic acid (DTPA), in the metal ion sequestering of thermomechanical pulps (TMP) to be hydrogen peroxide bleached. After different degrees of washing of the pulps, bleaching experiments at different total alkali charges were performed with and without sodium silicate additions, and the ISO brightness of hand-made sheets was measured. The residual hydrogen peroxide in the bleaching liquor was also determined. No significant difference in either the brightness development or the residual hydrogen peroxide content could be detected between the pulps treated with equivalent molar ratios of the different complexing agents. Furthermore, the recovery of the chelating surfactant-manganese complexes from laboratory made white water by froth flotation was also studied. Two different foaming agents; sodium dodecyl sulphonate (SDS) and dimethyldodecylamine oxide (DDAO), were tested in the froth generation. After an addition of 160 ppm of DDAO, more than 80% of the manganese chelates could be recovered in the foam, containing 3% of the initial water mass.

Keyword
Chelating surfactant; DTPA; Flotation; Hydrogen peroxide bleaching; Manganese; Thermomechanical pulp
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-16093 (URN)10.3183/NPPRJ-2012-27-01-p050-055 (DOI)000311019900006 ()2-s2.0-84860145718 (Scopus ID)
Available from: 2012-04-17 Created: 2012-04-17 Last updated: 2017-12-07Bibliographically approved
2. Removal of lipophilic extractives and manganese ions from spruce TMP waters in a customized flotation cell
Open this publication in new window or tab >>Removal of lipophilic extractives and manganese ions from spruce TMP waters in a customized flotation cell
2012 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 7, no 2, 2376-2392 p.Article in journal (Refereed) Published
Abstract [en]

The influence of a chelating surfactant, different foaming agents, cationic polyelectrolytes, pH value, and temperature on the purification efficiency of process waters from a mechanical pulp mill has been studied by flotation in a 1 L customized unit. Turbidity measurements and gas chromatography (GC) were carried out to determine the removal and characteristics of dissolved and colloidal substances (DisCo). The manganese ion content in the process waters before flotation and the metal chelate removal capacity by flotation were determined by Inductively Coupled Plasma (ICP) and Atomic Absorption Spectrometry (AAS) measurements. It was found that a 99% removal of complex bound manganese ions and a 94% decrease in turbidity of the TMP water produced at the laboratory can be achieved in a single-stage flotation with a chelating surfactant and a foaming agent. Furthermore, a 91% decrease in turbidity, the removal of up to 96% of resin and fatty acids, and 93% of triglycerides from TMP water can be obtained after application of a foaming agent.

Keyword
Chelating surfactant; Extractives; Flotation; Foaming agents; Internal cleaning stage; Purification
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-16094 (URN)000306481700077 ()2-s2.0-84863812526 (Scopus ID)
Available from: 2012-04-17 Created: 2012-04-17 Last updated: 2017-12-07Bibliographically approved
3. Use of a Voith flotation cell for removal of lipophilic extractives and Mn ions from spruce thermomechanical pulping process waters
Open this publication in new window or tab >>Use of a Voith flotation cell for removal of lipophilic extractives and Mn ions from spruce thermomechanical pulping process waters
2012 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 7, no 3, 2784-2126 p.Article in journal (Refereed) Published
Abstract [en]

The effects of a chelating surfactant and different foaming agents on the efficiency of cleaning process waters from a thermomechanical pulp (TMP) mill were studied in a Voith flotation cell. Turbidity measurements and gas chromatography were used to determine the removal extent and characteristics of dissolved and colloidal substances (DisCo). The metal ion content in the process waters before flotation and the metal chelate removal after flotation were determined using inductively coupled plasma-optical emission spectrometry (ICP-OES). FiberLab (TM) equipment was used to characterize changes in the size of fibers present in the process waters. The results indicate that a decrease in turbidity of up to 91% and the removal of 80% of lipophilic extractives in the TMP water could be obtained using a single-stage flotation unit. Furthermore, the foam fraction was within 5% of the initial volume, and 100% of the Mn2+/chelating surfactant complex added to the TMP water was removed.

Keyword
Flotation; Extractives; Foaming agents; Chelating surfactant; Purification; Internal cleaning stage
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-16095 (URN)000307639900007 ()2-s2.0-84865758132 (Scopus ID)
Projects
FORE/Återvinn
Available from: 2012-04-17 Created: 2012-04-17 Last updated: 2017-12-07Bibliographically approved

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