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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received May 26, 2015
Accepted July 30, 2015

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Flocculation and viscoelastic behavior of industrial papermaking suspensions

Mustafa S. Nasser^† Mohammed J. Al-Marri Abdelbaki Benamor Sagheer A. Onaizi¹ Majeda Khraisheh² Mohammed A. Saad²

Gas Processing Center, College of Engineering, Qatar University, P. O. Box 2713 Doha, Qatar ¹School of Chemical Engineering and Advanced Materials, Newcastle University, 535 Clementi Road, Blk 35 #02-01, Singapore 599489, Singapore ²Department of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713 Doha, Qatar

m.nasser@qu.edu.qa

Korean Journal of Chemical Engineering, February 2016, 33(2), 448-455(8), 10.1007/s11814-015-0167-y

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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_x000D_ 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.

Keywords

Papermaking Suspensions Flocculation Floc Size Effective Floc Density Rheology

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