Carbohydrazide is the compound with OC (N2H3)2 as its chemical formula. Carbohydrazide is a white, water-miscible solid. Carbohydrazide is a very stable and efficient oxygen scavenger in boilers and equipment that are in contact with water or steam in high temperatures.
Chemical and physical properties of Carbohydrazide
In the table below some of the chemical and physical properties of this product are mentioned. All data that is mentioned in this table is gathered from Wikipedia website:
Final efficiency and yield of equipment that work with steam and water like boilers depend on the chemicals that are used in order to control the corrosion and scaling of the water that is used in the system. In boilers and other equipment that are made of steel, oxygen may cause Corrosion.
One factor that may increase the risk of corrosion in boilers at high temperatures. Feedwater that is fed to boilers must contain chemicals that are corrosion inhibitors like hydrazine to control the oxygen scavenging. But as a matter of fact, hydrazine is extremely toxic due to reports so it can bring about several health problems. To reduce the risks that are caused by oxygen scavenger chemicals some chemicals are replaced with previous ones like Carbohydrazide.
Carbohydrazide minimized the oxygen content that cause corrosion and also it reduces the scaling and iron oxide deposition. This chemical does not add any inorganic materials to the system. In order to maximize the corrosion inhibitor efficiency, the residence time should be increased.
it is a very stable and efficient oxygen scavenger in a wide variety range of temperatures.
Advantageous of Carbohydrazide applied in steam equipment
- Low toxicity in comparison with other chemicals
- Easy to manage dose and control it
- Awesome protection against corrosion
- Without any residual in system
Synthesis of Carbohydrazide
In Industrial-scale the chemical is synthesized by the reaction of urea with hydrazine:
OC (NH2)2 + 2 N2H4 → OC (N2H3)2 + 2 NH3
The other way of this compound synthesis is through the reaction of carbonate ester and hydrazine.
Other Oxygen Scavenger chemicals which are available in Shanghai Chemex group website in this category are:
- Hydrazine Hydrate