The behaviour of an electrochemical reactor with decaying swirling flow is analysed for the production of colloidal sulphur using sulphur dioxide from synthetic effluents as raw material. The experiments were done under potentiostatic control with single- and two-phase flow. The best results were obtained at a cathodic potential of −0.7 V, against a saturated calomel electrode. Thus, in a single-phase experiment at a volumetric flow rate of 8 dm³ min⁻¹ and 1 g dm⁻³ SO₂ in 0.5 mol dm⁻³ H₂SO₄ as a supporting electrolyte, the current efficiency was 64% with a specific energy consumption of 22.7 kW h kg⁻¹ and a space time yield of 5.6 kg m⁻³ h⁻¹, achieving a total removal of sulphur dioxide after 15 min of operation. For sulphur dioxide concentrations lower than 2.5 g dm⁻³ the cathode surface remained free of a sulphur layer due to the impingement action of the swirling flow. Similar results were obtained under a two-phase flow of 5% SO₂ in nitrogen. In this case, the sulphur particles presented mainly spheroidal shape with an average size of 2.8 μm being of high purity. The comparison with other types of electrochemical reactors concludes that the equipment with swirling flow represents the best option.

分析了使用旋流衰减的电化学反应器的行为，以合成废水中的二氧化硫为原料生产胶体硫。实验是在单相和两相流动的恒电位控制下进行的。相对于饱和甘汞电极，在-0.7 V的阴极电位下可获得最佳结果。因此，在单相实验中，在0.5 dm ^-3 H ₂ SO _4中作为支持电解质，体积流量为8 dm ³  min ^-1和1 g dm ^-3 SO ₂时，电流效率为64％比能耗为22.7 kW h kg ^-1时空产率为5.6 kg m ^-3  h ^-1，操作15分钟后可完全去除二氧化硫。对于低于2.5g dm ^-3的二氧化硫浓度，由于旋流的冲击作用，阴极表面保持无硫层。在氮气中5％SO ₂的两相流动下获得了相似的结果。在这种情况下，硫颗粒主要呈球形，平均尺寸为2.8μm，具有高纯度。与其他类型的电化学反应器的比较得出的结论是，具有旋流的设备是最佳选择。