Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4766836 | Electrochimica Acta | 2017 | 45 Pages |
Abstract
An electrochemical reactor with a rotating cylinder electrode is analysed for the production of colloidal sulphur by oxidation of sulphide ions with a concentration of 2 g dmâ3 in alkaline solutions at 80 °C. The anode, coated with lead, was either a smooth cylinder or a three-dimensional one. The formation of polysulphides takes place in a wide range of potential of 0 to 1.2 V, against saturated calomel electrode (SCE), at a constant current density, which is independent on the rotation speed for values higher than 100 rpm. For the smooth anode the space time yield was 0.4 kg mâ3 hâ1. However, this parameter was increased 5 times in the potential range of 0.8 V to 1.2 V, vs. SCE, by using a three-dimensional structure with a bed depth of 8 mm. The specific energy consumption was 11.7 kW h kgâ1 with a current efficiency near 100%. When the sulphide ions were replenished by dissolution of hydrogen sulphide from a gas stream a further increase of the space time yield to 3.6 kg mâ3 hâ1 was achieved. At the end of the experiments the solution was acidified forming colloidal sulphur particles of different shapes with an average size of 5 μm.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
J.P. Fornés, J.M. Bisang,