Flocculation and viscoelastic behavior of industrial papermaking suspensions

Mustafa S. Nasser, Jaber Al Marri, Abdelbaki Benamor, Sagheer A. Onaizi, Majeda Khraisheh, Mohammed A. Saad

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The effects of the surface charge type and density C496, C492 and A130LMW polyacrylamides (PAMs) on the rheological behavior of real industrial papermaking suspensions were quantitatively related to the degree of flocculation for the same industrial papermaking suspensions. The floc sizes were larger but less dense when anionic PAM was used, and this due to the repulsive forces between the anionic PAM and colloidal particles, leading to the development of open structure flocs of less density. On the other hand, rheological measurements showed that the papermaking suspension is thixotropic with a measurable yield stress. The results showed that the magnitude of the critical stress, τc, complex viscosity, η*, elastic modulus, G′, and viscous modulus, G″, depend on the number of interactions between the PAM chains and particle surface and the strength of those interactions. Cationic PAM showed higher values of η*, G′, G″ and τc compared to anionic PAM. This behavior is in good agreement with Bingham yield stress, τB, adsorption and effective floc density results. Similar to oscillatory measurements, creep measurements also showed that the deformation was much lower for the cationic PAM based suspensions than for the anionic PAM based suspensions. Furthermore, the results revealed that increasing the cationic PAM surface charge decreases the floc size but increases the adsorption rate, elasticity and effective floc density proposing differences in the floc structures, which are not revealed clearly in the Bingham yield stress measurements.

Original languageEnglish
Pages (from-to)448-455
Number of pages8
JournalKorean Journal of Chemical Engineering
Volume33
Issue number2
DOIs
Publication statusPublished - 1 Feb 2016
Externally publishedYes

Fingerprint

Papermaking
Flocculation
Polyacrylates
Suspensions
Yield stress
Surface charge
polyacrylamide
Adsorption
Stress measurement
Elasticity
Creep
Elastic moduli
Viscosity

Keywords

  • Effective Floc Density
  • Floc Size
  • Flocculation
  • Papermaking Suspensions
  • Rheology

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Flocculation and viscoelastic behavior of industrial papermaking suspensions. / Nasser, Mustafa S.; Al Marri, Jaber; Benamor, Abdelbaki; Onaizi, Sagheer A.; Khraisheh, Majeda; Saad, Mohammed A.

In: Korean Journal of Chemical Engineering, Vol. 33, No. 2, 01.02.2016, p. 448-455.

Research output: Contribution to journalArticle

Nasser, Mustafa S. ; Al Marri, Jaber ; Benamor, Abdelbaki ; Onaizi, Sagheer A. ; Khraisheh, Majeda ; Saad, Mohammed A. / Flocculation and viscoelastic behavior of industrial papermaking suspensions. In: Korean Journal of Chemical Engineering. 2016 ; Vol. 33, No. 2. pp. 448-455.
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