Comparison of anionic membranes used to concentrate nitric acid to beyond the azeotropic mixture
Comparison of anionic membranes used to concentrate nitric acid to beyond the azeotropic mixture
The electrolysis of concentrated nitric acid solutions was carried out in an electrochemical cell with parallel plates (FM01-LC ICI). An anionic membrane that permits the migration of nitrate ions under the influence of an electrical field separated the anodic and cathodic compartments. The current efficiency for the transported nitrate ions was evaluated for several membranes, at a constant current. All the membranes allowed the transport of nitrate ions at different current efficiencies, following the increase in acid concentration in the anodic compartment. This electroseparation membrane process concentrated nitric acid from 25% up to 90% in successive stages. A special case to be noted was when the acid concentration was near the azeotropic value. In this case, the acid concentration in the anodic compartment rose above the azeotropic value of 68.5%, thus breaking the azeotrope mixture. It is expected that, for some niche applications, this process could be competitive with extractive distillation.
Electrodialysis, Nitric acid, Ion-exchange membranes, Separation
67-77
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Field, Robert
bd7dbfa8-2b1b-4f18-aae5-526c87ffe60d
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Field, Robert
bd7dbfa8-2b1b-4f18-aae5-526c87ffe60d
Ponce de Leon, Carlos and Field, Robert
(2000)
Comparison of anionic membranes used to concentrate nitric acid to beyond the azeotropic mixture.
Journal of Membrane Science, 171 (1), .
(doi:10.1016/S0376-7388(99)00383-X).
(Submitted)
Abstract
The electrolysis of concentrated nitric acid solutions was carried out in an electrochemical cell with parallel plates (FM01-LC ICI). An anionic membrane that permits the migration of nitrate ions under the influence of an electrical field separated the anodic and cathodic compartments. The current efficiency for the transported nitrate ions was evaluated for several membranes, at a constant current. All the membranes allowed the transport of nitrate ions at different current efficiencies, following the increase in acid concentration in the anodic compartment. This electroseparation membrane process concentrated nitric acid from 25% up to 90% in successive stages. A special case to be noted was when the acid concentration was near the azeotropic value. In this case, the acid concentration in the anodic compartment rose above the azeotropic value of 68.5%, thus breaking the azeotrope mixture. It is expected that, for some niche applications, this process could be competitive with extractive distillation.
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Azeotrope_separation.pdf
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Submitted date: 15 June 2000
Keywords:
Electrodialysis, Nitric acid, Ion-exchange membranes, Separation
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 54143
URI: http://eprints.soton.ac.uk/id/eprint/54143
ISSN: 0376-7388
PURE UUID: 3631ddaa-2cd9-44cc-a243-4e0602420542
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Date deposited: 01 Aug 2008
Last modified: 16 Mar 2024 03:43
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Author:
Robert Field
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