Preparation method and application of hydrazine hydrate

Hydrazine Hydrate

[Structural formula]

H ₂ N-NH ₂

[Physical and chemical properties] The appearance of this product is a colorless fuming liquid with strong reducing effect and corrosiveness

[Preparation]

Preparation method 1 Preparation of dilute hydrazine hydrate

For the preparation of sodium chlorate , dilute 30% of liquid caustic soda with water to about 20%, and inject chlorine gas at a certain flow rate below 30°C, so that the effective rate can reach 8% to 10%, and it can be cooled for later use

Add the sodium hypochlorite solution to the oxidation pot, then add an appropriate amount of 30% sodium hydroxide solution and 0.

Preparation method 2 Rasch method

The Rasch method (also known as the chloramine method or ammoxidation method) is one of the industrial production methods of hydrazine hydrate

This method has tended to be eliminated abroad, and the domestic production scale is small and the cost is relatively high

Preparation method 3 Urea method

On the basis of the Rasch method, urea is used instead of ammonia as the nitrogen source.

NH ₂ CONH ₂ +NaOCl+2NaOH→H ₂ N-NH ₂ ·H ₂ O+NaCl+Na ₂ CO ₃

Mix sodium hypochlorite and sodium hydroxide in a certain proportion to prepare a solution, add urea and a small amount of potassium permanganate while stirring, and heat to 103～104℃ for oxidation reaction.

[Application] Hydrazine hydrate and its derivatives are widely used in industrial applications such as thermal power plants and nuclear power plants as corrosion inhibitors for circulating water

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