Hydrazine – N2H4
A colourless liquid with an ammonia-like odor, hydrazine (N2H4), has a liquid range and density similar to water. Hydrazine, called hydronitrogens , is a powerful reducing agent. 
It is used in the synthesis of various pesticides, as a base for blowing agents that make the holes in foam rubber, and as a corrosion inhibitor in boilers. . It has a melting point of 2.0° C (35.6° F) and a boiling point of 113.5° C (236.3° F). N2H4 is used especially in fuels for rocket and jet engines. It can be combined with organic compounds to form jet and rocket fuels and is also used to make explosives, fungicides, medicines, and photographic chemicals.
Categories: Mediu, Science and Technology, Tech corrosion inhibitor, explosives, Hydrazine, hydronitrogens, N2H4, rocket fuels
- Hydrazine is highly toxic and dangerously unstable, especially in the anhydrous form.
- Symptoms of acute (short-term) exposure to high levels of hydrazine may include irritation of the eyes, nose, and throat, dizziness, headache, nausea, pulmonary edema, seizures, coma
- Acute exposure can also damage the liver, kidneys, and central nervous system
- liquid Hydrazine is corrosive and may produce dermatitis from skin contact in humans and animals
Hydrazine is commonly used as an oxygen
scavenger in high pressure steam boilers because the reaction products do not add to the solids content of the water and are innocuous to steel. The hydrazine-oxygen reaction:
N2H4 + O2 = 2H2O + N2
Another decomposition product of hydrazine is ammonia, which is beneficial to the prevention of condensate corrosion!
- Ammonia solutions (NH3) should be never mixed into any liquid containing bleach, or a poisonous gas may result. Mixing with chlorine-containing products or strong oxidants, for example household bleach can lead to hazardous compounds such as chloramines
- Ammonia even at dilute concentrations is highly toxic to aquatic animals, and for this reason it is classified as dangerous for the environment.
- Ammonium compounds should never be allowed to come in contact with bases , as dangerous quantities of ammonia gas could be released
- ammonia vapour from concentrated ammonia solutions is severely irritating to the eyes and the respiratory tract, and these solutions should only be handled in a fume hood
- Ammonia solutions should not be mixed with halogens, as toxic and/or explosive products are formed
- Exposure to high concentrations of gaseous ammonia can result in lung damage and death
May be it would be interesting to say that it is an inhitor corrosion’ agent by reducing oxygen which is in the water’s boilers. Secundly I would have like an explanation why reasons it is prohibited to use it in steam-boilers whose steam is used in alimentary facturies. Thank you