The requirements of the ion exchange membrane itself regarding the quality of brine
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This post was last edited by sunjl1981 on 2013-1-6 at 23:46 :) I would like to ask the more experienced members for advice: regarding the ion exchange membrane itself, besides ensuring that the quality of the saltwater is satisfactory by controlling its concentration, pH, temperature, and the levels of metal ions such as calcium and magnesium, what other aspects should be taken into consideration? If anyone has relevant information, I would be grateful if they could share it. Thank you: handshake # , , &
Thank you for coming :handshake After all, every visitor is a guest~! As the saying goes, “When people pass by, they leave their names; when geese fly by, they leave their sounds”:) I hope all the experienced members can offer their help! Thank you :handshake This post was last edited by seven~! on 2008-1-4 22:04.]
Calcium and magnesium ≤ 20 PPb; excessive levels cause hydroxide precipitation on the membrane. Nickel ≤10PPb; excessive levels cause hydroxide precipitation on the membrane. Strontium: ≤0.1PPm; excess levels cause precipitation on the membrane. Sodium sulfate ≤7g/l; if the level exceeds this value, it diffuses through the membrane, resulting in precipitation on the membrane. Iodine forms iodate (IO3) at the anode and reacts completely with NaOH to produce Na3H2IO6; it is insoluble in strong alkaline conditions. At concentrations of 0.2–1 PPM, exceeding this range has the effect of causing precipitation on the membrane under alkaline conditions. Aluminum/SiO2: <100 ppb; total aluminum content (soluble and precipitated): <5 ppm. Effects of exceeding these limits: Under acidic conditions, aluminum will precipitate on the membrane. Barium ≤0.5PPm; excess levels cause precipitation on the membrane. NaCO3 10—15g/l; excessive levels have the effect of damaging ion exchange resins. Fe ≤1PPm.
:) Thank you for your participation :handshake I hope everyone can keep helping! Does anyone know what the specific effects of too high a NACL concentration have on ion exchange membranes?
1. For iron levels, the required value is generally ≤50 PPb, and this requirement is usually met； 2. NaCO3 generally remains within the specified range after acidification, unless it is fed to the resin column without acidification: D ； 3. The effect of sodium chloride is mainly to affect the concentration of the anode solution, which in turn can cause damage to the membrane or lead to an increase in cell voltage ； 4. Are there any impact indicators for TOC? :handshake
Toc is generally required to be less than 10 ppm
Thank you for your advice~! :) In our normal operations, the NaCl concentration is generally kept at around 210 g/L. Once the concentration becomes too low, for example
:) Are there any other effects, besides the increased NaCl content which reduces the water permeability of the membrane, leading to an increase in osmotic concentration and thereby causing delamination between the perfluorocarboxylic acid and perfluorosulfonic acid layers and the formation of bubbles?