Use of MEKO (Methyl Ethyl Ketoxime) Instead of Hydrazine in Boiler Water Treatment

Hydrazine (N₂H₄) has been traditionally used as an oxygen scavenger in boiler feedwater to prevent corrosion. However, due to its toxicity and potential carcinogenic effects, alternative chemicals like Methyl Ethyl Ketoxime (MEKO) are being explored.

MEKO as an Oxygen Scavenger

Chemical Formula: C₄H₉NO

Mechanism:

MEKO reacts with dissolved oxygen in water, reducing the risk of oxygen-related corrosion.

Unlike hydrazine, MEKO does not form ammonia or hydrazine byproducts that can cause material degradation in certain systems.

It forms a protective oxide layer on metal surfaces, helping to prevent corrosion.

Comparison: MEKO vs. Hydrazine

Advantages of Using MEKO in Boilers

1. Safer Handling – Lower toxicity compared to hydrazine.

2. Environmental Benefits – Less hazardous byproducts.

3. Compatible with High-Pressure Boilers – Effective in modern power plants.

Challenges

Requires precise dosing for effective performance.

Slightly different reaction kinetics compared to hydrazine.

Conclusion

MEKO is emerging as a safer, environmentally friendly alternative to hydrazine in boiler water treatment. If you’re considering switching from hydrazine to MEKO in your thermal power plant, a detailed feasibility study and compatibility check with your specific boiler system is recommended.

Methyl Ethyl Ketoxime (MEKO) is primarily utilized as an anti-skinning agent in paints and coatings. It is not recognized as an oxygen scavenger in boiler water treatment.

Common alternatives to hydrazine for oxygen scavenging in boiler systems include:

Sodium Sulfite (Na₂SO₃): Effective in lower pressure systems, it reacts with dissolved oxygen to form non-scaling sodium sulfate.

Carbohydrazide: A derivative of hydrazine, it serves as an effective oxygen scavenger with lower toxicity.

Diethylhydroxylamine (DEHA): An organic oxygen scavenger that also offers passivation of metal surfaces.

Hydroquinone: An organic compound used for oxygen removal in various water treatment applications.


The selection of an appropriate oxygen scavenger depends on factors such as system pressure, temperature, and specific operational requirements. It’s essential to consult with a water treatment specialist to determine the most suitable and safe option for your boiler system.