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Recovery of water-soluble hemicelluloses from TMP process water after selective flotation.
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kemiteknik. (FSCN)ORCID-id: 0000-0002-0770-2086
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kemiteknik. (FSCN)ORCID-id: 0000-0003-3407-7973
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kemiteknik. (FSCN)
2013 (Engelska)Ingår i: The 17th International Symposiumon on Wood, Fiber and Pulping Chemistry, 2013Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Ort, förlag, år, upplaga, sidor
2013.
Nationell ämneskategori
Kemiteknik
Identifikatorer
URN: urn:nbn:se:miun:diva-20746OAI: oai:DiVA.org:miun-20746DiVA, id: diva2:679923
Konferens
The 17th International Symposiumon on Wood, Fiber and Pulping Chemistry
Tillgänglig från: 2013-12-17 Skapad: 2013-12-17 Senast uppdaterad: 2014-06-27Bibliografiskt granskad
Ingår i avhandling
1. Selective Separation Of Wood Components In Internal Process Waters Originating From Mechanical Pulping
Öppna denna publikation i ny flik eller fönster >>Selective Separation Of Wood Components In Internal Process Waters Originating From Mechanical Pulping
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Sundsvall: Mid Sweden University, 2014. s. 178
Serie
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 184
Nyckelord
flotation, foaming agents, chelating surfactant, TMP process water, pitch control, internal cleaning stage, hemicellulose recovery, anti‐solvents, solvents, precipitation
Nationell ämneskategori
Polymerkemi
Identifikatorer
urn:nbn:se:miun:diva-22244 (URN)978-91-87557-45-3 (ISBN)
Disputation
2014-05-28, O102, Holmgatan 10, Sundsvall, 12:33 (Engelska)
Opponent
Handledare
Projekt
FORE
Forskningsfinansiär
KK-stiftelsen, 2180
Tillgänglig från: 2014-06-27 Skapad: 2014-06-23 Senast uppdaterad: 2015-03-13Bibliografiskt granskad

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Zasadowski, DariuszNorgren, MagnusEdlund, Håkan

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