Effects of charge density and molecular weight of papermaking sludge-based flocculant on its decolorization efficiencies

2020 ◽  
Vol 723 ◽  
pp. 138136
Author(s):  
Kangying Guo ◽  
Baoyu Gao ◽  
Jingwen Pan ◽  
Xue Shen ◽  
Caiyu Liu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Charge Density

A tensammetric study of the adsorption of cationic polymers and copolymers

1991 ◽  
Vol 69 (10) ◽  
pp. 1516-1519
Author(s):  
Truis Smith-Palmer ◽  
Cheryl Roberts
Keyword(s):  
Molecular Weight ◽  
Charge Density ◽  
Key Words ◽  
Potential Versus ◽  
Cationic Polymers ◽  
Capacitive Current ◽  
Cationic Polyacrylamide

The tensammograms of several sets of cationic polyacrylamide copolymers are discussed and compared. Tensammograms are not affected by molecular weight, but plots of capacitive current at a chosen potential versus charge density give regular curves. Key words: tensammetry, cationic, polyacrylamide, charge density.

Wet End Performance of Polydimethyl-Diallyl Ammonium Chloride with Different Characteristics

2011 ◽  
Vol 233-235 ◽  
pp. 1597-1602
Author(s):  
Jin Wang ◽  
Li Jun Wang ◽  
He Xiao ◽  
Jin Shan Chen
Keyword(s):  
Molecular Weight ◽  
Chemical Oxygen Demand ◽  
Charge Density ◽  
Ammonium Chloride ◽  
Oxygen Demand ◽  
Suspended Solid ◽  
Fiber Suspension ◽  
Solid Materials ◽  
Different Characteristics ◽  
Dissolved And Colloidal Substances

PDADMAC fixing agents with different characteristics were used to control dissolved and colloidal substances in P-RC APMP fiber suspension. Results showed that PDADMAC with higher charge density was easier to interact with anionic trash, resulting in better removal of suspended solid materials and chemical oxygen demand(COD). The PDADMAC achieved 78% removal of chemical oxygen demand. PDADMAC with higher molecular weight could easily be adsorbed onto fibers and fines, and had good removal for anionic trash. It was also found that PDADMAC with higher molecular weight was better to remove suspended solid substances, while PDADMAC with lower molecular weight was more effective for removing chemical oxygen demand(COD).

scholarly journals Parameters of Drag Reducing Polymers and Drag Reduction Performance in Single-Phase Water Flow

2014 ◽  
Vol 6 ◽  
pp. 202073 ◽  
Author(s):  
A. Abubakar ◽  
A. R. Al-Hashmi ◽  
T. Al-Wahaibi ◽  
Y. Al-Wahaibi ◽  
A. Al-Ajmi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Drag Reduction ◽  
Charge Density ◽  
Single Phase ◽  
Polymer Concentration ◽  
Ionic Polymers ◽  
Horizontal Pipe ◽  
Polymer Backbone ◽  
Maximum Drag Reduction ◽  
Phase Water

This study presents experimental investigation about the effect of polymer parameters on the performance of the drag reducing polymers in single-phase water flowing in a horizontal pipe of 30.6 mm ID. Master solutions (1000 ppm) of ten high-molecular weight polymers were injected at different flow rates to achieve polymer concentrations in the range of 2–40 ppm in the test section. The drag reduction increased with polymer concentration up to 10 ppm, above which it reached a plateau value. While the drag reduction at the plateau value increases with polymer molecular weight, the maximum drag reduction was not affected by the increase in polymer charge density up to 13%. For instance, the maximum drag reduction for anionic polymers with molecular weight 6–8 million Da. and charge density between 5 and 13% was around 60%, which decreased to around 38% for the polymer with charge density of 25%. Ionic polymers provided more drag reduction than nonionic ones. The overall conclusion is that drag reduction depends on polymer ability to form intermolecular associations and/or its flexibility, which can be enhanced by increasing molecular weight, decreasing charge density, and selecting smaller side groups in the main polymer backbone.

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