Flocculation and viscoelastic behavior of industrial papermaking suspensions

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• 作者：Mustafa S. Nasser ; Mohammed J. Al-Marri…
• 关键词：Papermaking Suspensions ; Flocculation ; Floc Size ; Effective Floc Density ; Rheology
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：33
• 期：2
• 页码：448-455
• 全文大小：368 KB
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• 作者单位：Mustafa S. Nasser (1)
  Mohammed J. Al-Marri (1)
  Abdelbaki Benamor (1)
  Sagheer A. Onaizi (2)
  Majeda Khraisheh (3)
  Mohammed A. Saad (3)
  
  1. Gas Processing Center, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar
  2. School of Chemical Engineering and Advanced Materials, Newcastle University, 535 Clementi Road, Blk 35 #02-01, Singapore, 599489, Singapore
  3. Department of Chemical engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

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, τ _c , 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 τ _c compared to anionic PAM. This behavior is in good agreement with Bingham yield stress, τ _B , 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