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- W2158303670 abstract "Kinetics of V(IV) extraction from acidic sulfate medium by Cyanex 302 (2,4,4-trimethylpentylmonothio phosphinic acid, [H2A2](o)) dissolved in kerosene were investigated using a Lewis cell operated at 3 Hz and flux (F) method of data treatment. The F (kmol/m2s) is inversely proportional to (1 + 0.01 [V(IV)]−1), (1 + 2000 [H+]), and (1 + 0.089 ) and directly proportional to (1 + 0.2 [ ]). The activation energy (E a ) depends on the temperature region and is a function of reactants (f(R)). When log f(R) 48 kJ/mol and when log f(R)>−0.3, E a < 20 kJ/mol. Within log f(R) values of −1.0 to −0.3, E a varies within 20–50 kJ/mol. The rate constant (k) at 293 K is 10−7.335 kmol/m2 s. The entropy changes in activation (ΔS ‡) were measured as negative value always. The complicated empirical rate equation was analyzed to provide extraction mechanisms in different parametric conditions, being supported by E a values. In most cases, the extraction process is either diffusion controlled or mixed controlled..." @default.
- W2158303670 created "2016-06-24" @default.
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- W2158303670 date "2014-09-15" @default.
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- W2158303670 title "Kinetics of Forward Extraction of V(IV) in V(IV)-SO2-4(H+, NA+)-Cyanex 302-Kerosene System Using Lewis Cell Technique" @default.
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- W2158303670 doi "https://doi.org/10.1080/00986445.2013.836634" @default.
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