I need a method for calibration Methanol in Membranes and that by HPLC please helping me for that, Thank you so much for reading my Question
The water and methanol uptake was determined by Raman spectrometry.The swelling and diffusion behaviour of a Nafion®117 ion-exchange membrane can be investigated in mixed water–methanol solutions. The membrane porosity is found as a function of the methanol content in solution. Moreoften, permeation experiments can be set in conditions where a membrane initially separated a water–methanol electrolyte solution from a solution prepared with pure water, both solutions containing either 0.1 M HCl or 0.5 M HCl. Different rotation speeds of stirrer rods may be applied in the range of 70–700 rpm. A mathematical model for water–methanol permeation through a membrane taking into account the transfer through adjacent diffusion boundary layers (DBLs) and the dependence of the methanol diffusion coefficient on the methanol concentration can be developed. The DBL thickness, δ, and the methanol permeability, P*, can be determined by numerical fitting of experimental data. It can be found that the rotating stirrers used in the cell were almost as efficient as rotating electrodes or membranes: we have found that δ ≈ 1.2δLevich, where δLevich can be calculated by the well-known Levich equation for rotating disc electrodes. However, the contribution of diffusion resistance of DBL into the overall resistance of the three-layer system may not negligible, even at high rotation speeds, due to high methanol permeation through Nafion®117. When taking into account the DBLs, the “true” methanol permeability of Nafion®117 in the presence of 0.5 M HCl in the upstream and downstream compartments (at 25 °C) may be equal to 0.44 × 10−5 cm2 s−1.
Dear Mohamed, if I understand correctly you want to quantify Methanol from permeability studies? If so, do you have access to a GC with FID detector?
yes, I have it but i try to found new Method by HPLC or HPLC Semipreprative. Thank you so much. really Appreciated Jaco Van Rooyen and Ravi Kant Upadhyay. have a nice day
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