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Physical Properties

Carbohydrazide is a white crystalline solid with a melting point of 153-154°C. It decomposes upon melting. It is very water soluble and largely insoluble in organic solvents.

Synthesis

Hydrazinolyis of Carbonate Esters

(C2H5O)2CO + 2N2H4•H20 → NH2NHCONHNH2 + 2C2H5OH + 2H2O

Hydrazinolysis of Phosgene

ClCOCl + NH2NH2 → NH2NHCOCl

NH2NHCOCl + NH2NH2 → NH2NHCONHNH2

NH2NHCOCl + ClCOCl → ClCONHNHCOCl

ClCONHNHCOCl + NH2NH2 → NH2NHCONHNHCONHNH2

Hydrazinolysis of Carbazic Acid

NH2NHCOOH•NH2NH2 → NH2NHCONHNH2 + H2O

Industrial Uses

Oxygen Scrubber

Carbohydrazide is used as an oxygen scrubber in boiler systems. Oxygen scrubbers remove oxygen gas from the boiler system to prevent corrosion.

Polymers

Carbohydrazide can react with many aromatic compounds to create polymers. Carbohydrazide can be used as a curing agent for epoxide-type resins.

Photography

Carbohyrazide is used in the silver halide diffusion process as one of the toners. Carbohydrazide is used to stabilize color developers that produce images of the azo-methine and azine classes.

Other

Carbohydrazide has been used to develop ammunition propellants, stabilize soaps, and used a reagent in organic synthesis. (patent)

Hazards

Heating carbohydrazide may result in an explosion. Carbohydrazide is harmful if swallowed, irritating to eyes, respiratory system, and skin. Carbohydrazide is toxic to aquatic organisms. (MSDS)