A Mass Transfer Coefficient for Radial Flow Adsorption and Ion Exchange

2012 ◽  
Vol 51 (3) ◽  
pp. 1429-1434
Author(s):  
Dennis F. Hussey ◽  
Ashwini K. Pandey ◽  
Gary L. Foutch
Keyword(s):  
Mass Transfer ◽  
Ion Exchange ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Radial Flow

Temperature Dependencies of Inter-Diffusion Coefficient and Mass-Transfer Coefficient of Chemical Strengthening

2016 ◽  
Vol 702 ◽  
pp. 32-36
Author(s):  
Maya Hatano ◽  
Satoshi Kanasugi ◽  
Masaaki Konishi
Keyword(s):  
Mass Transfer ◽  
Diffusion Coefficient ◽  
Ion Exchange ◽  
Simulation Model ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Compressive Stress ◽  
Parameter Study ◽  
Fictive Temperature ◽  
Chemical Strengthening

Chemical strengthening is a method of generating compressive stress on the glass surfaces by ion-exchange to improve their strengths since old ages. As its targets have been expanding to larger and thinner glasses recently, different strength profiles are required depending on the applications and selecting appropriate ion-exchange parameters becomes even more important. Therefore, we developed a simulation model of chemical strengthening which enables predicting the stress profiles by ion-exchange in order to help optimizing the ion-exchanging parameters. Parameter study using the simulation model with change of temperature results in precise stress prediction, the compressive stress on the surface with a margin of error of ± 3% and the depth of layer with that of ± 10%. Furthermore, the parameter study introduced following two technical findings; (1) both inter-diffusion coefficient and mass-transfer coefficient could obey the Arrhenius equation, (2) both actual temperature and fictive temperature could influence on the stress relaxation. These findings are of great importance in comprehending the phenomena associated with ion-exchange. It has possibilities for beneficial feedback to the composition development and optimum stress design in accordance with each application.

Kinetic Study for Ion Exchange of Taurine on D290 Anion Exchange Resin

2012 ◽  
Vol 562-564 ◽  
pp. 85-89
Author(s):  
Feng Song ◽  
Shu Juan Zhuang
Keyword(s):  
Mass Transfer ◽  
Diffusion Coefficient ◽  
Ion Exchange ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Experimental Temperature ◽  
Coefficient Increase

The kinetics of ion exchange of taurine on D290 anion exchange resin was investigated. The uptake curves of taurine on D290 anion exchange resin were determined in batch stirred tanks, and the diffusion coefficient and the mass transfer coefficient were computed, and the effects of stirred velocity and experimental temperature on the rate of uptake of taurine on D290 resin were discussed. The results showed that with the experimental temperature and the stirred velocity increasing, the rate of uptake of taurine on D290 anion exchange resin increase. And with the increase of the experimental temperature, the diffusion coefficient and the mass transfer coefficient increase .With the increase of the stirred velocity, the diffusion coefficient increase and the mass transfer coefficient don’t be affected. Based on the Helfferich number of this system, the mass transfer process of taurine taken up on D290 resin is dominated by the film diffusion.

Bilirubin Removal from an Hepatic Failure Patient by Resin Hemoperfusion

1981 ◽  
Vol 4 (3) ◽  
pp. 146-147 ◽  
Author(s):  
L. Mor ◽  
S. Sideman ◽  
M. Mihich ◽  
U. Taitelman
Keyword(s):  
Mass Transfer ◽  
Ion Exchange ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Hepatic Failure ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Human Albumin ◽  
Volumetric Mass Transfer Coefficient ◽  
Unconjugated Hyperbilirubinemia

An hemoperfusion (HP) column, packed with beads of a macroreticular MR ion exchange resin which were made biocompatible by coating with a fine layer of cross-linked human albumin, was applied to the removal of bilirubin (BIL) from a jaundiced 69-year old man with hepatic failure. The column was found most suitable for BIL removal. However, the high volumetric mass transfer coefficient of the unconjugated (UC) BIL indicates that this column could best be used for BIL removal from babies suffering from unconjugated hyperbilirubinemia.

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