Study of the effect of some macro-molecules on transfer coefficient of electrode processes

1962 ◽  
Vol 186 (2) ◽  
pp. 114-116 ◽  
Author(s):  
H. P. Agarwal
Keyword(s):  
Transfer Coefficient ◽  
Electrode Processes

scholarly journals Definition of the transfer coefficient in electrochemistry (IUPAC Recommendations 2014)

2014 ◽  
Vol 86 (2) ◽  
pp. 259-262 ◽  
Author(s):  
Rolando Guidelli ◽  
Richard G. Compton ◽  
Juan M. Feliu ◽  
Eliezer Gileadi ◽  
Jacek Lipkowski ◽  
...  
Keyword(s):  
Transfer Coefficient ◽  
Current Density ◽  
Cathodic Current Density ◽  
Anodic Current Density ◽  
Anodic Current ◽  
Cathodic Current ◽  
Electrode Processes ◽  
Green Book ◽  
Definition Of ◽  
Applied Electric Potential

Abstract The transfer coefficient α is a quantity that is commonly employed in the kinetic investigation of electrode processes. An unambiguous definition of the transfer coefficient, independent of any mechanistic consideration and exclusively based on experimental data, is proposed. The cathodic transfer coefficient αc is defined as –(RT/F)(dln|jc|/dE), where jc is the cathodic current density corrected for any changes in the reactant concentration on the electrode surface with respect to its bulk value, E is the applied electric potential, and R, T, and F have their usual significance. The anodic transfer coefficient αa is defined similarly, by simply replacing jc with the anodic current density and the minus sign with the plus sign. This recommendation aims at clarifying and improving the definition of the transfer coefficient reported in the 3rd edition of the IUPAC Green Book.

EFFECT OF DISCHARGE RADIATION ON ELECTRODE PROCESSES IN HELIUM

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-465-C7-466
Author(s):  
L. I. Kiselevskii ◽  
N. Ya. Klygin ◽  
A. N. Makarevich ◽  
D. A. Soloviyanchik
Keyword(s):  
Electrode Processes

Evaporation of lignin-lean black liquor

TAPPI Journal ◽  
2015 ◽  
Vol 14 (7) ◽  
pp. 441-450
Author(s):  
HENRIK WALLMO, ◽  
ULF ANDERSSON ◽  
MATHIAS GOURDON ◽  
MARTIN WIMBY
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Black Liquor ◽  
Salt Content ◽  
Solubility Limit ◽  
Lignin Removal ◽  
Kraft Black Liquor ◽  
Black Liquors ◽  
The Heat Transfer Coefficient

Many of the pulp mill biorefinery concepts recently presented include removal of lignin from black liquor. In this work, the aim was to study how the change in liquor chemistry affected the evaporation of kraft black liquor when lignin was removed using the LignoBoost process. Lignin was removed from a softwood kraft black liquor and four different black liquors were studied: one reference black liquor (with no lignin extracted); two ligninlean black liquors with a lignin removal rate of 5.5% and 21%, respectively; and one liquor with maximum lignin removal of 60%. Evaporation tests were carried out at the research evaporator in Chalmers University of Technology. Studied parameters were liquor viscosity, boiling point rise, heat transfer coefficient, scaling propensity, changes in liquor chemical composition, and tube incrustation. It was found that the solubility limit for incrustation changed towards lower dry solids for the lignin-lean black liquors due to an increased salt content. The scaling obtained on the tubes was easily cleaned with thin liquor at 105°C. It was also shown that the liquor viscosity decreased exponentially with increased lignin outtake and hence, the heat transfer coefficient increased with increased lignin outtake. Long term tests, operated about 6 percentage dry solids units above the solubility limit for incrustation for all liquors, showed that the heat transfer coefficient increased from 650 W/m2K for the reference liquor to 1500 W/m2K for the liquor with highest lignin separation degree, 60%.

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