The effects of pH on the accumulation of fines, dissolved and colloidal substances in the short circulation of papermaking

Jani Lehmonen, Juha Houni, P. Raiskinmäki, L. Vähäsalo, Antti Grönroos

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

The fluctuation of pH makes a process more sensitive to unwelcome precipitates and web breaks. pH is also one of the major factors that affect the solubility of different substances. For these reasons, accumulation studies of water circulation in a papermaking process were carried out. Accumulation studies were performed using a two-stage refined thermomechanical pulp (TMP) and a wide range of pH levels. The process temperature was 50°C and the average pH levels were from 4 to 10. pH has a significant effect on the amount of dissolved and colloidal material in the filtrate water. At high pH, accumulation was generally slightly higher than at low pH. The rheology of the filtrate water also changes considerably as a function of pH, and thereby has an effect on the water removal in a papermaking process. The results indicated that depending on the shear rate level of the filtration process the viscosity change is in the order often percent. So, rheological properties of filtrate water may play an important role in the water removal process. The results indicate that the dissolution of resin acid as a result of an increase of pH lowers the viscosity of the filtrates.
Original languageEnglish
Pages (from-to)46-52
Number of pages7
JournalJournal of Pulp and Paper Science
Volume35
Issue number2
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Fingerprint

Papermaking
Water
Viscosity
Thermomechanical pulp
Rheology
Shear deformation
Precipitates
Dissolution
Resins
Solubility
Acids

Keywords

  • papermaking
  • water circulation
  • pH

Cite this

@article{fadb0cd1e13846fab10c3e2d1e6e3c71,
title = "The effects of pH on the accumulation of fines, dissolved and colloidal substances in the short circulation of papermaking",
abstract = "The fluctuation of pH makes a process more sensitive to unwelcome precipitates and web breaks. pH is also one of the major factors that affect the solubility of different substances. For these reasons, accumulation studies of water circulation in a papermaking process were carried out. Accumulation studies were performed using a two-stage refined thermomechanical pulp (TMP) and a wide range of pH levels. The process temperature was 50°C and the average pH levels were from 4 to 10. pH has a significant effect on the amount of dissolved and colloidal material in the filtrate water. At high pH, accumulation was generally slightly higher than at low pH. The rheology of the filtrate water also changes considerably as a function of pH, and thereby has an effect on the water removal in a papermaking process. The results indicated that depending on the shear rate level of the filtration process the viscosity change is in the order often percent. So, rheological properties of filtrate water may play an important role in the water removal process. The results indicate that the dissolution of resin acid as a result of an increase of pH lowers the viscosity of the filtrates.",
keywords = "papermaking, water circulation, pH",
author = "Jani Lehmonen and Juha Houni and P. Raiskinm{\"a}ki and L. V{\"a}h{\"a}salo and Antti Gr{\"o}nroos",
year = "2009",
language = "English",
volume = "35",
pages = "46--52",
journal = "J-FOR: Journal of Science & Technology for Forest Products and Processes",
issn = "1927-6311",
number = "2",

}

The effects of pH on the accumulation of fines, dissolved and colloidal substances in the short circulation of papermaking. / Lehmonen, Jani; Houni, Juha; Raiskinmäki, P.; Vähäsalo, L.; Grönroos, Antti.

In: Journal of Pulp and Paper Science, Vol. 35, No. 2, 2009, p. 46-52.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The effects of pH on the accumulation of fines, dissolved and colloidal substances in the short circulation of papermaking

AU - Lehmonen, Jani

AU - Houni, Juha

AU - Raiskinmäki, P.

AU - Vähäsalo, L.

AU - Grönroos, Antti

PY - 2009

Y1 - 2009

N2 - The fluctuation of pH makes a process more sensitive to unwelcome precipitates and web breaks. pH is also one of the major factors that affect the solubility of different substances. For these reasons, accumulation studies of water circulation in a papermaking process were carried out. Accumulation studies were performed using a two-stage refined thermomechanical pulp (TMP) and a wide range of pH levels. The process temperature was 50°C and the average pH levels were from 4 to 10. pH has a significant effect on the amount of dissolved and colloidal material in the filtrate water. At high pH, accumulation was generally slightly higher than at low pH. The rheology of the filtrate water also changes considerably as a function of pH, and thereby has an effect on the water removal in a papermaking process. The results indicated that depending on the shear rate level of the filtration process the viscosity change is in the order often percent. So, rheological properties of filtrate water may play an important role in the water removal process. The results indicate that the dissolution of resin acid as a result of an increase of pH lowers the viscosity of the filtrates.

AB - The fluctuation of pH makes a process more sensitive to unwelcome precipitates and web breaks. pH is also one of the major factors that affect the solubility of different substances. For these reasons, accumulation studies of water circulation in a papermaking process were carried out. Accumulation studies were performed using a two-stage refined thermomechanical pulp (TMP) and a wide range of pH levels. The process temperature was 50°C and the average pH levels were from 4 to 10. pH has a significant effect on the amount of dissolved and colloidal material in the filtrate water. At high pH, accumulation was generally slightly higher than at low pH. The rheology of the filtrate water also changes considerably as a function of pH, and thereby has an effect on the water removal in a papermaking process. The results indicated that depending on the shear rate level of the filtration process the viscosity change is in the order often percent. So, rheological properties of filtrate water may play an important role in the water removal process. The results indicate that the dissolution of resin acid as a result of an increase of pH lowers the viscosity of the filtrates.

KW - papermaking

KW - water circulation

KW - pH

M3 - Article

VL - 35

SP - 46

EP - 52

JO - J-FOR: Journal of Science & Technology for Forest Products and Processes

JF - J-FOR: Journal of Science & Technology for Forest Products and Processes

SN - 1927-6311

IS - 2

ER -