کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7021212 | 1456007 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Co-ion fluxes of simple inorganic ions in electrodialysis metathesis and conventional electrodialysis
ترجمه فارسی عنوان
جیوه های همجوشی یونهای معدنی ساده در متادهای الکترو دیالیز و الکترودیلیز معمولی
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کلمات کلیدی
غشای تبادل یونی، همجوشی، متاتز الکترو دیالیز معمولی، ناخالصی ها،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
چکیده انگلیسی
The main functionality of ion-exchange membranes is to selectively permeate either cations or anions. However, co-ions may permeate as well to some extent through these membranes. For the production of chemicals with electrodialysis metathesis and conventional electrodialysis, these co-ion fluxes are a major source of impurities in the produced chemicals. The present paper studies the co-ion fluxes and the influence of operating parameters. The results clearly indicate that co-ion fluxes are predominately determined by the difference in ion concentration across the membrane. A more than linear increase in co-ion flux with respect to the ion concentration was observed. The current density has no significant influence on the co-ion fluxes. Therefore, a high current density leads to a smaller transport number of co-ions and improves the product purity in electrodialysis metathesis. Moreover, the co-ion flux can be decreased by the use of bulky counter-ions. In a conventional electrodialysis configuration, cation impurities are mainly caused by a diffusional flux. This flux is approximately three times larger than the co-ion flux. In contrast, the anion impurities are predominantly initiated by a co-ion flux and in magnitude smaller than the cation impurities.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 492, 15 October 2015, Pages 263-270
Journal: Journal of Membrane Science - Volume 492, 15 October 2015, Pages 263-270
نویسندگان
T. Rottiers, G. De la Marche, B. Van der Bruggen, L. Pinoy,