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Abstract

The potential application of a DEM cell for the electrolysis of hydrogen bromide in the Ispra Mark 13A process for flue gas desulphurisation has been tested in a number of laboratory experiments and in long-duration tests in a bench-scale plant of the process. Satisfactory electrode materials have been found, i.e. Hastelloy C 276 for the cathode and RuO(2) coating on titanium for the anode. Both electrode materials showed a good stability during a 1500 hours experiment. Cell voltage/current density relationships have been determined during bench-scale plant operation. A typical value is 1.5V at a current density of 2.5 kA/m2. It has been shown that in an undivided cell a cathodic back reaction occurs which causes a decrease of the current efficiency. Under normal operation conditions current efficiencies of about 90% are obtained. A simplified flow model for the DEM cell was developed which will be useful to understand the phenomena which occur during scale-up of the cell. An industrial size installation for the production of 170 kg/h of bromine at a current density of 2 kA/m2 was constructed and has been in operation since November 1988.

Additional information

Authors: VAN VELZEN D, JRC Ispra (IT);LANGENKAMP H, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Electrochemical Cell Design and Optimization Procedures, Bad Soden (DE), Sept. 24-26, 1990
Availability: Available from (1) as Paper EN 35725 ORA
Record Number: 199011594 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en
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