ELTECH’s Dense Pak™ Cells Installed at BleachTech, Seville, OH	De Nora's membrane cell electrolyzers produce membrane grade chlorine gas (Cl2), caustic soda (NaOH) or caustic potash (KOH), and hydrogen gas (H2). The cells are typically operated under a slight positive pressure, allowing customers to use the chlorine gas generated to produce sodium hypochlorite (bleach) and hydrochloric acid (HCl) without the purchase and maintenance of expensive gas compressors or fans.
ELTECH Gruppo De Nora provided the ExL™ Family of Electrolyzers. The ExL is an improved version of the MGC™ Cells which provides Extra Low voltage and power consumption and offers the ability to achieve the longest possible life of the membranes. The ExL Electrolyzer is offered as a user friendly 1.5m2 active area per cell and is currently available in two electrical configurations: ExLM Monopolar Cell Electrolyzer ExLDP Dense Pak™ Unit * *Bipolar-Monopolar Hybrid Electrolyzer. The ExLM Monopolar Electrolyzer and the ExLDP Dense Pak are an improved version of the MGC Electrolyzer that has been in full-scale commercial service since 1986. These ExL Electrolyzers look the same as their MGC counterparts on the outside. Improvements have been made in the internal anode and cathode electrode design and fabrication techniques. These improvements provide increased internal circulation and the ultimate in current distribution across the active membrane area. These changes result in consistently lower cell voltage over the life of the electrolyzer at current densities up to 6 kA/m2, although even higher current density has been demonstrated.
ELTECH Gruppo De Nora's ExLDP Dense Pak™ incorporates multiple membrane electrolyzers into a single unit. The advantages of the Dense Pak system include reduced cell room area, reduced piping requirements and more cost effective transformer - rectifier design. Dense Pak electrolyzers can be designed to fit a wide variation in existing circuit voltages and amperages. One of the key benefits of the ExLDP Dense Pak is that it allows individual units to be shutdown without a shutdown of the entire circuit. This provides a much higher on-stream factor versus conventional bipolar electrolyzers. Even if a plant has a separate rectifier system for each bipolar electrolyzer, there can be upsets in the customers’ gas header pressure control systems when shutting down or starting up a bipolar circuit, even if a long time is taken to make this production load change. This inherent higher on-stream factor is one of the leading reasons some chlor-alkali and bleach producers have selected ELTECH’s hybrid Dense Pak technology over conventional bipolar for plant installations of less than 150 tons per day capacity. The Dense Pak product can produce high purity bleach, allowing longer shelf life and reduced environmental and regulatory risk from handling liquid chlorine in rail cars. The Dense Pak is ideal for regional bleach production or on-site chlorine manufacture. There are potential cost savings from skipping the chlorine liquefication step.
ELTECH Gruppo De Nora's ExLM Monopolar Technology is widely used around the world, typically in larger production facilities. Electrolyzers can be assembled with 2 to 30 cells per electrolyzer. The wide range in circuit voltage and amperage that can be accommodated makes it the ideal choice for retrofitting any diaphragm or mercury cell-room easily. The energy consumption of the ExLM Monopolar is comparable to the energy consumption of bipolar cells on the market today.
Membrane Cell Anode Coatings ELTECH De Nora offers three coatings with long lifetimes and low operating potentials for service in chlor-alkali membrane cells. EC300 is ELTECH Gruppo De Nora ’s standard membrane coating. It offers low oxygen and low chlorate inefficiency EC305 offers the lowest oxygen with slightly higher chlorate inefficiency. Millennium 3™ (M3) is a patent pending coating that is the lowest cost membrane coating in the world.
ELTECH Gruppo De Nora's VRS™ Voltage Reduction Solution allows significant voltage reductions in any membrane cell technology that utilizes nickel based cathodes. VRS is a cost effective option to activate uncoated or reactivate coated cathodes on-line to reduce energy and cell disassembly and renewal costs. ECC-11™ Cathode Coating - The chlor-alkali industries leading cathode coating available for Chlorine Membrane cells. This platinum based electro catalyst delivers the lowest hydrogen over-potential for maximum electrical savings. ECC-11 Cathode Coating also provides excellent wear resistance through a permanent coating which causes no caustic contamination as compared to competitive coatings. ECC-11 Cathode Coating can be cleaned and rejuvenated (unlike competitive coatings) and once iron deposits are removed, voltage performance is restored. ECC-11 can be applied over a variety of substrates including mesh, louvers, sheet, punched plate and screen. Usage does require cell disassembly.
Membrane Recoating Services: Ashai Kasei ML32 FC/NCS De Nora Tech MGC™ / ExL™ Uhde/Uhdenora BM 2.7 m2