Phase Distribution of Resin and Fatty Acids in Colloidal Wood Pitch Emulsions at Different pH-Levels

Sundberg, Anna; Strand, Anders; Vähäsalo, Lari; Holmbom, Bjarne

doi:10.1080/01932690802646249

Cited by 25 publications

(32 citation statements)

References 8 publications

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“…Sundberg et al (2009) and Strand et al (2011) showed that the pH value has a significant influence on the phase distribution of fatty and resin acids in water solution. The lower the pH value, the higher the content of fatty and resin acids in the colloidal phase.…”

Section: Effect Of Different Foaming Agents In Combination With a Chementioning

confidence: 99%

Removal of lipophilic extractives and manganese ions from Spruce TMP waters in a customized flotation cell

Zasadowski¹,

Hedenström²,

Edlund³

et al. 2012

BioResources

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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.

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Section: Effect Of Different Foaming Agents In Combination With a Chementioning

confidence: 99%

Removal of lipophilic extractives and manganese ions from Spruce TMP waters in a customized flotation cell

Zasadowski¹,

Hedenström²,

Edlund³

et al. 2012

BioResources

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“…[5] A sigmoid curve was fitted to the experimental data by minimizing the root-mean-squared error (RMSE) between the experimental data and the sigmoid curve. The curves are plotted in the figures while the pK lw values are listed in the tables.…”

Section: Calculationsmentioning

confidence: 99%

“…The solubility of the RFAs is dependent on various conditions, such as temperature, pH, concentration and type of component. While increased temperature is usually thought to favour a greater solubility, a previous study [5] showed only little difference in the phase distribution for RFAs between temperatures of 30 C and 70 C. Kanicky [6] reported that as the chain length of fatty acids increases, van der Waals forces cause tighter packing, thus lowering the solubility. The closer chains lead to other charged groups stabilizing the proton in the carboxyl group and, thus, make it harder to be removed by hydroxyl ions.…”

Section: Introductionmentioning

confidence: 97%

“…The term ''colloidal pK a '' was introduced by McLean and coworkers, [11] and refers to the pK a at concentrations of the components exceeding the CMC. The term ''pK lw '' was introduced by Sundberg and coworkers [5] to define the pH at which 50% of the RFAs is found in the lipophilic, colloidal droplets (l) and 50% is found in the water phase (w). In this study, the term pK lw will be used to determine the pH at which 50% of the component in question is attached to the colloidal droplets, or occur as precipitated particles, while 50% is found in the water phase.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Calcium on the Phase Distribution of Resin and Fatty Acids in Pitch Emulsions

MacNeil

Sundberg

Vähäsalo

et al. 2011

Journal of Dispersion Science and Technology

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Resin and fatty acids (RFAs) play a key role in deinking processes of recycled fiber after precipitation by calcium. The distribution of RFAs between the lipophilic/colloidal phase and the water phase, here called pK lw , was determined by gas chromatography for different emulsions of TMP pitch and fatty acid soaps in the presence of calcium ions. Resin acids were at least partially dissolved at alkaline conditions even at high calcium ion concentrations, while fatty acids were only slightly soluble. The structure of the component was an important factor, along with the calcium content present which made fatty acids practically insoluble.

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“…In a recent study, the authors studied a model system relevant to lipophilic wood pitch in mechanical pulp and further manufacturing of wood-containing paper [24]. Wood pitch, which is colloidally dispersed as a dilute emulsion of pitch droplets, was analysed for the distribution of resin and fatty acids between the lipophilic phase, mainly composed of triglycerides and steryl esters, and the water phase in the pH range 3-11.…”

Section: Resin and Fatty Acids As Surfactantsmentioning

confidence: 99%

Surface‐Active Compounds as Forest‐Industry By‐Products

Holmbom

Sundberg

Strand

2010

Surfactants From Renewable Resources

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Phase Distribution of Resin and Fatty Acids in Colloidal Wood Pitch Emulsions at Different pH-Levels

Cited by 25 publications

References 8 publications

Removal of lipophilic extractives and manganese ions from Spruce TMP waters in a customized flotation cell

Removal of lipophilic extractives and manganese ions from Spruce TMP waters in a customized flotation cell

Effect of Calcium on the Phase Distribution of Resin and Fatty Acids in Pitch Emulsions

Surface‐Active Compounds as Forest‐Industry By‐Products

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