کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
687456 889322 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetics and mechanism of extraction of Cu(II) by CYANEX 302 from nitrate medium and oxidative stripping of Cu(I) using Lewis cell technique
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Kinetics and mechanism of extraction of Cu(II) by CYANEX 302 from nitrate medium and oxidative stripping of Cu(I) using Lewis cell technique
چکیده انگلیسی
In the present work, the forward extraction kinetics of Cu(II) from nitrate medium using CYANEX 302 in kerosene and kinetics of oxidative stripping of Cu(I)-CYANEX 302 chelate have been investigated using a Lewis cell. Extraction and stripping rates are governed by reactions at liquid-liquid interface rather than in the bulk phase. Extraction and stripping regimes are deduced to be chemical-controlled for Cu(II) and Cu(I). The different parameters affecting the extraction rate were separately studied and the extraction mechanism is discussed according to the dimeric model of CYANEX 302 in non-polar solvent. The stripping of Cu(I) from loaded organic solutions was achieved by using high concentration of nitric acid which oxidizes the extracted Cu(I) to Cu(II). Kinetic studies on the stripping of Cu(I) from loaded CYANEX 302 with nitric acid were also carried out using the same Lewis cell, and the mechanism of stripping process has been also proposed. From the temperature dependence of the rate measurement, the values of activation energy (E), enthalpy change (ΔH) and entropy change (ΔS) are calculated for both systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering and Processing: Process Intensification - Volume 49, Issue 1, January 2010, Pages 84-90
نویسندگان
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