miun.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Recovery of water-soluble hemicelluloses from TMP process water after selective flotation.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)ORCID iD: 0000-0002-0770-2086
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)ORCID iD: 0000-0003-3407-7973
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)
2013 (English)In: The 17th International Symposiumon on Wood, Fiber and Pulping Chemistry, 2013Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
2013.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-20746OAI: oai:DiVA.org:miun-20746DiVA, id: diva2:679923
Conference
The 17th International Symposiumon on Wood, Fiber and Pulping Chemistry
Available from: 2013-12-17 Created: 2013-12-17 Last updated: 2014-06-27Bibliographically approved
In thesis
1. Selective Separation Of Wood Components In Internal Process Waters Originating From Mechanical Pulping
Open this publication in new window or tab >>Selective Separation Of Wood Components In Internal Process Waters Originating From Mechanical Pulping
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Dissolved and Colloidal substances (DSC) and metals are released from woodduring thermomechanical pulp (TMP) production. These components have atendency to accumulate in process waters, as the water circulation systems inintegrated paper mills are closed. Disturbances such as pitch depositions in thepaper machine (pitch problems), specks in the paper, decreased wet and drystrength, interference with cationic process chemicals, and impaired sheetbrightness and friction properties appear when DSC are present. Transition metalions such as manganese results in higher consumption of bleaching chemicals(hydrogen peroxide) and lowers the optical quality of the final product, andaddition of complexing agents, such as EDTA or DTPA, to prevent this is needed.The never ending trends to decrease water consumption and increase processefficiency in pulp and paper production emphasizes that it is very important bothto know the effects of wood substances on pulping and papermaking and to beable to remove them in an efficient way. From a biorefinery point of view, DSCcomponents can be promising renewable raw materials for biofuels, bio‐basedchemicals and materials.In this thesis, a new approach using induced air flotation (IAF) without a cationicpolyelectrolyte addition for the removal of pitch and metal ions from mechanicalpulp mill process waters is presented. The induced air flotation of different processwaters is facilitated by the addition of a chelating surfactant and different foamingagents. The influence of the pH value, temperature and foaming agentconcentration on the flotation efficiency has been investigated. The investigations

presented show that the disturbing components can be removed from TMP presswater to a high extent. A 90% decrease in turbidity and a 91% removal of lipophilicextractives (i.e. resin and fatty acids, triglycerides, sterols and steryl esters) fromunbleached and bleached TMP process water can be obtained by addition of acationic surfactant as foaming agent during flotation. Lower amount of foamingagent is needed to purify efficiently bleached TMP process water, than unbleached.Additionally, fibres located in TMP press water are not removed with the foamfraction but purified. A retained concentration of hydrophilic extractives (i.e.hemicelluloses and lignans) in the process water indicates that the flotation isselective. Moreover, by introduction of a new recoverable surface activecomplexing agent, a chelating surfactant, manganese ions in the form of chelatescan be successfully removed from the pulp fibres and separated from the processwater in the same flotation process. Furthermore, from the purified unbleachedTMP process water a 90% recovery of dissolved hemicelluloses by anti‐solventprecipitation was obtained.The findings presented above indicate new possibilities for the internal watercleaning stage to decrease DSC emissions to recipient and for recovery of valuableraw materials from purified process water if flotation technology is applied in anintegrated mechanical pulp mill.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2014. p. 178
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 184
Keywords
flotation, foaming agents, chelating surfactant, TMP process water, pitch control, internal cleaning stage, hemicellulose recovery, anti‐solvents, solvents, precipitation
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:miun:diva-22244 (URN)978-91-87557-45-3 (ISBN)
Public defence
2014-05-28, O102, Holmgatan 10, Sundsvall, 12:33 (English)
Opponent
Supervisors
Projects
FORE
Funder
Knowledge Foundation, 2180
Available from: 2014-06-27 Created: 2014-06-23 Last updated: 2015-03-13Bibliographically approved

Open Access in DiVA

No full text in DiVA

Authority records BETA

Zasadowski, DariuszNorgren, MagnusEdlund, Håkan

Search in DiVA

By author/editor
Zasadowski, DariuszNorgren, MagnusEdlund, Håkan
By organisation
Department of Chemical Engineering
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 798 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf