Nafion™ N982TX is an early high performance product of Chemours that was introduced in 1998 and specifically designed for optimum gas/liquid circulation between the anode and the membrane’s anode surface. The functional groups in this Nafion membrane are based on the carboxylic acid and sulfonic acid type and this membrane is a bilayer membrane (where the carboxylic acid and sulfonic acid layers are located on the opposite sides of the fabric reinforcement).
• Reinforced for safe operation
• Modified on both the anode and cathode surface to enhance gas release
• Ready for direct use in Chloralkali Electrolyzer Applications
• Cell Voltage: < 3.15V
• Current Efficiency: > 96%
Nafion™ N982TX is provided in the Na+ form, but also available in K+ form in the WX product version upon request.
Nafion™ N982TX membrane in TX form is pre-expanded and ready to install directly into chloralkali electrolyzers without any pretreatment. Refer to Technical Bulletin T-05, “Nafion™ Membrane TX Products,” for information on TX membranes.
Nafion™ TX membrane was developed by Chemours to provide a membrane that is easy to handle and at the same time offers improved resistance to damage from handling. An additional advantage of TX membrane products is that they are expanded to a level that gives adequate tentering during cell operation and, consequently, wrinkle-free performance. The agent used to pre-expand Nafion™ to the TX form is diethyleneglycol (DEG). This is a glycolethyl ether that must be removed before operation by soaking with water or dilute caustic/brine after installing the membranes in the electrolyzer. DEG/water solutions can be biodegraded before disposal.
Note: To prevent gradual evaporation of the DEG and subsequent membrane shrinkage, do not open the shipping container until membranes are ready for installation.
• When ready to install, open the container and remove the polyethylene (PE) cover from the roll of membranes.
• Unroll one sheet at a time onto a flat, clean surface. Carefully transfer each sheet into the clean, dry electrolyzer. Note: Electrodes must be clean and dry.
• After the membranes have been installed, tighten the assembly using normal closing pressure.
• Unused membrane pieces should be left rolled on the original shipping core and resealed with polyethylene wrap for storage.
The TX membranes contain about 80 g/m² DEG, which is removed after assembly tightening and before start-up to prevent foaming during initial operation. For specific procedures, contact your hardware supplier. The DuPont supplemental procedure is:
• Fill the electrolyzer with 2 wt% NaCl solution in the anode side and 2 wt% NaOH solution in the cathode side-ambient temperature. Soak for about 30 minutes and drain. Depending on specific recommendations from the electrolyzer manufacturer, alkaline (0.1 to 2.0 wt% NaoH) deionized water can also be used for soaking in place of the NaCl/NaOH solutions.
• This procedure may have to be repeated once or twice in order to bring the DEG concentration to an acceptably low level.
After DEG removal, follow normal membrane chloralkali start-up and operating procedures provided by Chemours and your hardware supplier. If membranes have to be removed after operation, they should be handled and stored wet as described in the “Nafion™ User's Guide.” (Bulletin T-10). Reinstallation must also follow User's Guide procedures.
Note: The side marked CATH must be installed facing the cathode; otherwise, the membrane will be irreversibly damaged in use.
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