Mixing Effects in Continuous Free‐Radical Solution Copolymerization Tank Reactors: I—Characterization of Residence Time Distributions

2018 ◽  
Vol 12 (6) ◽  
pp. 1800037 ◽  
Author(s):  
Bruno F. Oechsler ◽  
Israel B.S. Poblete ◽  
Príamo A. Melo ◽  
José C. Pinto
Keyword(s):  
Free Radical ◽  
Residence Time ◽  
Mixing Effects ◽  
Residence Time Distributions ◽  
Radical Solution

scholarly journals Using free radical polymerization and Mannich reaction, synthesis and characterization of cationic polyacrylamides having similar molecular weight but different charge densities

2018 ◽  
Vol 9 (2) ◽  
pp. 79-83 ◽  
Author(s):  
Raid Saleh Shatat ◽  
Shaik Kalimulla Niazi
Keyword(s):  
Molecular Weight ◽  
Free Radical ◽  
Mannich Reaction ◽  
Solution Polymerization ◽  
Similar Molecular Weight ◽  
Charge Densities ◽  
Polyacrylamide Solution ◽  
Acrylamide Monomer ◽  
Radical Solution

Using free radical solution polymerization technique and Mannich reaction, five different polyacrylamides with similar molecular weight but variable charge densities were synthesized. High molecular weight polyacrylamides were synthesized using potassium persulfate and N,N,N',N'-tetramethylethylenediamine system as initiators. This was achieved by increasing the concentration of acrylamide monomer. They were then characterized by infrared spectroscopy, viscosity measurements and glass transition temperature measurement. These compounds with various cationic charge densities from 48.2, 161.7, 355, 425 and 485 C/g were prepared through Mannich reaction. The results indicate, by increasing the acidity of the polyacrylamide solution using sulfuric acid, the pH of the polyacrylamide solution decreases correspondingly. As a result, the positive charges increased resulting in the enrichment of charge densities.

Mixing Effects in Continuous Free‐Radical Solution Copolymerization Tank Reactors: II—Investigation of Micromixing Effects

2019 ◽  
Vol 13 (5) ◽  
pp. 1900018
Author(s):  
Bruno F. Oechsler ◽  
Israel B. S. Poblete ◽  
Príamo A. Melo ◽  
José C. Pinto
Keyword(s):  
Free Radical ◽  
Mixing Effects ◽  
Radical Solution

On the use of late-time peaks of residence time distributions for the characterization of hierarchically nested groundwater flow systems

2016 ◽  
Vol 543 ◽  
pp. 47-58 ◽  
Author(s):  
Jun-Zhi Wang ◽  
Anders Wörman ◽  
Etienne Bresciani ◽  
Li Wan ◽  
Xu-Sheng Wang ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Residence Time ◽  
Late Time ◽  
Groundwater Flow Systems ◽  
Flow Systems ◽  
Residence Time Distributions

Characterization of mixing and residence time distributions in nozzle-type reactors

1989 ◽  
Vol 12 (1) ◽  
pp. 262-269 ◽  
Author(s):  
Akintunde Kayode Coker ◽  
Geoffrey Vaughan Jeffreys ◽  
Clive James Mumford
Keyword(s):  
Residence Time ◽  
Residence Time Distributions ◽  
Nozzle Type
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