Chlorine dioxide ClO2 is a combination of Chlorine and Oxygen. In the room temperature the chlorine dioxide is an amber-colored and toxic gas and it has a stinging smell like Chlorine. The mixture of chlorine dioxide with air is extremely explosive with a concentration more than 10% of the volume. It is usually used in liquid solution which is not explosive.

Chlorine dioxide ClO2 One method of production is the so called Hydrochloric acid - Chlorite Process: The chlorine dioxide solution originates from Hydrochloric acid (HCl) and Sodium chlorite (NaClO2) with the formula: 4 HCl + 5 NaClO2 = 4 ClO2 + 5 NaCl + 2 H2O Hydrochloric acid + Sodium chlorite = Chlorine dioxide + Sodium chlorite (salt) + water The reaction becomes exothermic! Other methods for drinking water preparation according to DVGW-worksheets W 224 and W 624: Chlorine-Chlorite-Process: 2 NaClO2 + Cl2 = 2 ClO2 + 2 NaCl Peroxide sulfate-Chlorite-Process: 2 NaClO2 + Na2S2O2 = 2 ClO2 + 2 Na2SO4

Hydrochloric acid-Chlorite Process with diluted chemicals 4 HCl + 5 NaClO2 = 4 ClO2 + 5 NaCl + 2 H2O Hydrochloric acid (9%) + Sodium chlorite (7,5%) = Chlorine dioxide + ... In practice: 0,5 Liter Hydrochloric acid (9%) + 0,5 Liter Sodium chlorite (7,5%) = 1 Liter Chlorine dioxide solution (Conc. 20 g/l) To avoid the possible formation of explosive Chlorine dioxide gas-/air mixture, the concentration will be reduced from around 20 g/l to 2 g/l by the dilution with water directly inside the reactor.

Batch System PI QIS Water

Proportional System QIS Water

Comparison PI QIS

Technical Specifications ECLD 8 and ECLD 20 Technical Specifications ECLD 8 ECLD 20 ClO2 - Capacity g/h 8 20 Max. operation pressure bar 10 Max. consumption of chemicals l/h each 0.2 each 0.5 Concentration of stock solution g/l approx. 20 Adjustable output concentration 2-20 Power supply 90 – 265 V, 50/60 Hz Energy consumption W/h 50 Type of protection IP 65 Dimension: Width mm 400 Height 850 Depth 345 Weight kg approx. 22

Proportional Mode QIS

Proportional + Reading Mode QIS ClO2

Batch Mode

ECLD-D ECLD-D 36 54 140 220 400 640 1010 ClO2 - Capacity g/h 354 Max. operation pressure bar 12 8 10 7 4 Max. consumption of chemicals (each) l/h 0.91 1.35 3.6 5.5 16 25.2 Power supply 90 – 265 V, 50/60 Hz Energy consumption W/h 70 90 110 210 Type of protection IP 65 Weight (approx.) kg 61 63

Pre-dilution system for ECLD-D Accessories Gas alarm instruments Multifunction valve LIQUID CONTROL SYSTEMS Pre-dilution system for ECLD-D Injection device with static mixer Calibration Cylinder

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