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Contribution to the caustic soda market made by thyssenkrupp Uhde Chlorine Engineers’ filterpress technology

After supplying the monopolar type electrolyzer DCM for more than 100 projects worldwide, thyssenkrupp Uhde Chlorine Engineers (Japan) Ltd. has supplied the filterpress bipolar ion-exchange membrane process electrolyzer - BiTAC - for more than 200 projects since 1994.

The first generation of the BiTAC Family, BiTAC®, was developed to attain the highest current density operation at the lowest possible power consumption while minimizing mechanical damage to the ion exchange membranes, which tend to be more vulnerable to damage in a zero-gap environment.

The design philosophy of the BiTAC family has been maintained throughout the development of each generation – BiTAC®, n-BiTAC and nx-BiTAC, each contributing to an improvement in performance, reliability and maintainability compared with the previous generation. Also to be noted is the interchangeability of elements which makes it possible for users to upgrade their plant by simply replacing older generation elements with new ones.

To achieve higher performances compared with the previous generation, R&D efforts focused on creating a smoother anode surface, improving the gas/liquid separation mechanism and the spring mechanism on the cathode side that creates the zero-gap effect, which makes the largest contribution to reducing power consumption and enhancing the electrical conductivity of the elements.

While the robust and highly reliable monopolar solution – DCM – was well received by users around the world, in the first 10 years alone the first generation BiTAC was selected for more than 40 projects, including Bayer in Baytown TX USA (now Covestro) and other major chlor alkali manufacturers around the world. The second generation, n-BiTAC, introduced to the market in 2005, was even more successful than its predecessor.

Our latest generation, nx-BiTAC, was introduced to the market in 2013 and has attained record sales of 20 projects worldwide in the first 3 years, with its exceptional performance of 2,010 kWh/t-2,025 kWh/t (6kA/m2) (expected), compared with the 2,200 kWh/t (6kA/m2) offered to our clients by the first generation back the in 1990s.

History of performance improvement of the BiTAC series
History of performance improvement of the BiTAC series
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