membrane separation process for inclusion polymer for selective extraction and total cr (vi) from an aqueous mixture containing acid ions (cr (vi) and cr (iii).

摘要

in order to successfully retrieve the element chromium, while respecting the environment, we should use other methods for liquid liquid separation to extract the ions from aqueous acidic solutions in accordance with the principles of green chemistry.this invention is in this context, the purpose of which is to separate the two heavy metals (cr6 + and cr3 +) using a polymer inclusion membrane (imp). the membrane is formed of a material allowing the passage of ions cr6 + from one phase (f) containing an aqueous mixture of the initial ion cr6 + and cr3 + to a receiving stage (r) containing pure water.the use of a pim is a process (not solvent) and fast, low energy costs). the strong point of this invention is the optimization of operating conditions for the recovery of cr6 + ions in a speedy and efficient way.the macroscopic parameters, initial permeability and flux j p, on the separation of mixtures of cr3 + ions 1cr6 + have been determined for the different factors (ion concentration, acidity, temperature. .). for different environments, a clear evolution of these parameters was observed for the imps.the initial flow of ions chromium extraction facility, and is related to the initial concentration of the substrate in the feeding by a law of saturation, which enabled the determination of the apparent diffusion coefficient in microscopic parameters, d and constant level n kass (extracting substrate complex), formed in the organic phase.the determination of the activation parameters (ea, djti and t,. #) relative to the transition state for the complexation reaction at the interface source membrane may explain the evolution of kas and parameters.