Titanium Anode For Sodium Hypochlorite Generator

A sodium hypochlorite generator is a device in which the salt water of low concentration is electrolyzed by electrodes, the electrochemical reaction happens and it generates sodium hypochlorite finally. Here is an example of an electrolytic cell and MMO anode.

 

The detailed technical data of the anode for sodium hypochlorite production:

 

Lifespan: 3 years,5 years, and 10 years according to clients' requests.

 

Solution: 5% sodium chloride solution.

 

Current density: 800-1500 A/m².

 

Temperature: less than 60 degrees.

 

Production amount requested: 1.25kg/hour.

 

Chlorine evolution efficiency of electrolytic tank, over 90% in salt solution, over 85% in seawater (the Sodium chloride concentration should be 3 %-5% in seawater.)

 

Chlorine evolution potential: less than 1.13V.

 

Polarizability of potential difference: less than 40 mV (test the potential difference under the current density of 200 A/M² and 2000A/M².)

 

Available chlorine is 8-10g/l in the sodium hypochlorite solution produced.

 

Details of Accelerated life testing regarding to 5-year request:

 

Solution: 0.5 molar/L, H₂SO₄.

 

Temperature: 40±1 degree

 

Current density: 20000A/M²

 

Qualified after 50 hours test, which shows MMO anodes for sodium hypochlorite production reaches the 5-year lifespan.

 

According to the practical requirements, the MMO anodes are changeable. Here are some other forms of MMO titanium anodes to produce sodium hypochlorite.

 

The Hooker process is the large-scale industrial method of sodium hypochlorite production. In the process, sodium hypochlorite (NaClO) and sodium chloride (NaCl) are formed when chlorine is passed into a cold and dilute sodium hydroxide solution. It is prepared industrially by electrolysis with minimal separation between the anode and the cathode. The solution must be kept below 40 °C (by cooling coils) to prevent the undesired formation of sodium chlorate.

 

Cl2 + 2 NaOH → NaCl + NaClO + H2O

 

The sodium hypochlorite can be obtained by electrolysis salt solution. Due to the simple facility and obvious disinfection effects; the hypochlorite generator has been extensively valued. Sodium hypochlorite has been widely used to disinfect drinking water, sanitary wares, dish wares, fruits, and vegetables. Our anode products measure up to the standard GB12176-2000 Class A and have been extensively marketed.

 

Applications of Titanium Anode for Sodium Hypochlorite Generator:

 

Municipality and community water treatment: drinkable and wastewater;

 

Cooling water treatment: power station, petrochemical & refining plants;

 

Disinfection: swimming pools and water parks;

 

Marine sewage treatment;

 

Antifouling: shipboard, vessel.

 

Advantages of Titanium Anode for Sodium Hypochlorite Generator:

 

Safety: no chemical aggressiveness of raw materials;

 

Economy: low cost of raw materials;

 

Convenience: easy to install.

 

The NaCl in the solution exists in an ionic state, and under the action of the electric field, Cl2 is produced on the surface of the anode, and H2 and OH- are produced on the surface of the cathode:

 

2Cl--2e → Cl2↑

 

2H2O+2e → H2↑+ 2OH-

 

Since there is no diaphragm between the cathode and anode, Cl2 and OH- undergo a secondary chemical reaction in solution to form ClO-:

 

Cl2+2OH- → Cl-+ClO-+H2O

 

The total reaction equation is:

 

NaCl+H2O→NaClO+H2↑

 

Electrochemical performance and life test

 

Items	Strengthen weightlessness mg	Polarizability mv	Chlorine evolution potential V	Test Conditions
Ru/Ir titanium anode	≤10	40	＜1.13	1mol/L H2SO4

 

Actual use parameters (seawater environment)

 

Work conditions g/L	Current A/m2	Salt consumption kg	Power consumption kwh/kg	Hypochlorous acid yield g/L
30-50	500-1500	4-7	3.7-7	6-10

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