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The impact of the electrical potential gradient on limestone dissolution under wet flue gas desulfurization conditions

Brogren, C and Karlsson, Hans LU (1997) In Chemical Engineering Science 52(18). p.3101-3106
Abstract
The flux of an ion in an ionic solution is due to a concentration gradient and an electrical potential gradient. The latter is a result of differences in the diffusion constants of the diffusing ions. Even though it is possible to express the electrical potential gradient in terms of concentrations and concentration gradients, it results in a complicated system to solve if more than two species diffuse. In this study the dissolution rate of limestone has been modeled with the flux equations, including the electrical potential gradient and assuming that the electrical potential gradient is zero. Under wet flue gas desulfurization (WFGD) conditions which correspond to a rather high ionic strength, > 100 mM, it was found that the impact of... (More)
The flux of an ion in an ionic solution is due to a concentration gradient and an electrical potential gradient. The latter is a result of differences in the diffusion constants of the diffusing ions. Even though it is possible to express the electrical potential gradient in terms of concentrations and concentration gradients, it results in a complicated system to solve if more than two species diffuse. In this study the dissolution rate of limestone has been modeled with the flux equations, including the electrical potential gradient and assuming that the electrical potential gradient is zero. Under wet flue gas desulfurization (WFGD) conditions which correspond to a rather high ionic strength, > 100 mM, it was found that the impact of the potential gradient is insignificant when the pH of the slurry is above 3. Furthermore, it has been shown that when neglecting the potential gradient, the mass balances must be combined with a flux of charge condition and not a condition of electroneutrality. (C) 1997 Elsevier Science Ltd. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
limestone dissolution, mass transfer, electrical potential gradient
in
Chemical Engineering Science
volume
52
issue
18
pages
3101 - 3106
publisher
Elsevier
external identifiers
  • wos:A1997XU01300006
  • scopus:0342378126
ISSN
0009-2509
DOI
10.1016/S0009-2509(97)00129-2
language
English
LU publication?
yes
id
c115da7e-203e-4c56-bf00-6b12c9d474fa (old id 3915500)
date added to LUP
2013-07-02 09:03:10
date last changed
2017-01-01 07:15:52
@article{c115da7e-203e-4c56-bf00-6b12c9d474fa,
  abstract     = {The flux of an ion in an ionic solution is due to a concentration gradient and an electrical potential gradient. The latter is a result of differences in the diffusion constants of the diffusing ions. Even though it is possible to express the electrical potential gradient in terms of concentrations and concentration gradients, it results in a complicated system to solve if more than two species diffuse. In this study the dissolution rate of limestone has been modeled with the flux equations, including the electrical potential gradient and assuming that the electrical potential gradient is zero. Under wet flue gas desulfurization (WFGD) conditions which correspond to a rather high ionic strength, > 100 mM, it was found that the impact of the potential gradient is insignificant when the pH of the slurry is above 3. Furthermore, it has been shown that when neglecting the potential gradient, the mass balances must be combined with a flux of charge condition and not a condition of electroneutrality. (C) 1997 Elsevier Science Ltd.},
  author       = {Brogren, C and Karlsson, Hans},
  issn         = {0009-2509},
  keyword      = {limestone dissolution,mass transfer,electrical potential gradient},
  language     = {eng},
  number       = {18},
  pages        = {3101--3106},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Science},
  title        = {The impact of the electrical potential gradient on limestone dissolution under wet flue gas desulfurization conditions},
  url          = {http://dx.doi.org/10.1016/S0009-2509(97)00129-2},
  volume       = {52},
  year         = {1997},
}