Dissolved and colloidal substances from a mechanical pulp suspension—Interactions influencing the sterical stability

Nylund, Jan; Sundberg, Anna; Sundberg, Kenneth

doi:10.1016/j.colsurfa.2006.12.068

Cited by 19 publications

(17 citation statements)

References 21 publications

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“…It has been found that due to the low solubility of these compounds in water, they can appear as suspended colloids in the process (Ström 2000;Nylund et al 2007). At a pH near the pK a values, resin acids especially tend to combine with colloidal particles, whereas at pH values higher than pK a values, the amounts of these compounds in water can rise to a higher level.…”

Section: Foaming Holmbom 1999amentioning

confidence: 99%

Overview of Analytical Procedures for Fatty and Resin Acids in the Papermaking Process

Knuutinen¹,

Alén²

2012

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This review describes the role of wood extractives, especially fatty and resin acids, in papermaking, as well as the importance of their removal from process waters. One of the main aims is also to illustrate versatile analysis methods for this purpose and highlight recent developments in corresponding applications. Most of the current methods require timeconsuming and laborious sample pretreatment procedures prior to gas chromatography coupled either with flame ionization or mass selective detection. However, some faster, even online techniques with minimum sample pretreatment, are also available, mainly including high performance liquid chromatography coupled with mass spectrometry. The advantages and disadvantages of all analytical procedures are briefly discussed.

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Section: Foaming Holmbom 1999amentioning

confidence: 99%

Overview of Analytical Procedures for Fatty and Resin Acids in the Papermaking Process

Knuutinen¹,

Alén²

2012

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“…7). The carboxylic groups are in protonated form at low pH, which means that the droplets are uncharged at pH below 3 (Nylund et al 2007). At increasing pH, the carboxylic groups are increasingly dissociated, and the colloidal droplets are anionically charged.…”

Section: Extractives-related Contributors To Cationic Demandmentioning

confidence: 99%

Dissolved and Colloidal Substances (Dcs) and the Charge Demand of Papermaking Process Waters and Suspensions: A Review

et al. 2012

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Dissolved and colloidal substances (DCS) in the process waters of paper machine systems can interfere with the retention of fine particles, retard the drainage of water from the wet web, and generally hurt the intended functions of various polyelectrolytes that are added to the process. This review considers publications that have attempted to characterize the nature and effects of different DCS fractions, in addition to some of the ways that paper technologists have attempted to overcome related problems. The consequences of DCS in a paper machine system can be traced to their ability to form complexes with various polyelectrolytes. Such tendencies can be understood based on a relatively strong complexing ability of multivalent materials, depending on the macromolecular size and charge density. Continuing research is needed to more fully understand the different contributions to cationic demand in various paper machine systems and to find more efficient means of dealing with DCS.

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“…DCS simulacra suspensions and fiber suspensions with different concentrations were prepared, and the concentration and turbidity of these DCS simulacra suspension and fiber suspensions were highly correlated (Nylund et al 2007), as shown in Figs. 3 and 4, the R 2 of the linear equation between concentration and turbidity of DCS was close to 1.…”

Section: Filtered Pei In Dcs Simulacramentioning

confidence: 99%

Polyethyleneimine Addition for Control of Dissolved and Colloidal Substances: Effects on Wet-End Chemistry

Wang¹,

Chen²,

Ren³

et al. 2016

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Within the pulp and paper industry, the recycling of whitewater to reduce fresh water consumption and effluent volume leads to an accumulation of dissolved and colloidal substances (DCS) in the papermaking wet-end system. DCS interacts with certain electrolytes and polyelectrolytes to form non-ionic DCS interferents (pitch deposits and depositions), which adversely affect papermaking. Polyethyleneimine (PEI), a fixing agent with a low molecular weight and high cationic charge density, can control the DCS in the wet-end system. The fixation efficiency of DCS simulacra and the wet-end properties were explored under varying Ca 2+ and PEI concentrations in pulp. The fixation and retention efficiency of DCS simulacra were improved, the zeta potential of pulp and drainage rate of pulp increased, and the cationic demand of pulp filtrate decreased with increasing PEI dosage. Ca 2+ shielded the negatively charged ions on the surface of the fibers and DCS simulacra, influenced the fixation efficiency of PEI to DCS simulacra, and improved the drainage rate of pulp.

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Dissolved and colloidal substances from a mechanical pulp suspension—Interactions influencing the sterical stability

Cited by 19 publications

References 21 publications

Overview of Analytical Procedures for Fatty and Resin Acids in the Papermaking Process

Overview of Analytical Procedures for Fatty and Resin Acids in the Papermaking Process

Dissolved and Colloidal Substances (Dcs) and the Charge Demand of Papermaking Process Waters and Suspensions: A Review

Polyethyleneimine Addition for Control of Dissolved and Colloidal Substances: Effects on Wet-End Chemistry

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