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Talking about the comparison of various production processes by wholesale manufacturers of hydrazine hydrate
2020-12-30

Comparison of various production processes of hydrazine hydrate wholesalers:

Urea oxidation

The traditional hydrazine hydrate production process is currently our company's main production process. Urea and liquid alkali synthesize crude hydrazine. Through further multi-stage distillation, it is 80% hydrazine hydrate. The technology is mature and the quality is stable. The disadvantage is that compared with other processes, the energy consumption is larger and the cost is slightly higher.

2 ketone method

The ketone-nitrogen method is a new technology developed abroad in the 1970s. The method is to oxidize ammonia with chlorine or sodium hypochlorite in the presence of excess acetone to form methyl ketone nitrogen, which is then hydrolyzed to hydrazine under pressure. The advantages of this method are high yield, about 95% and low energy consumption. The disadvantage is that the addition of acetone will cause the system to produce organic by-products, which are harmful to ketone-containing wastewater, and are difficult to treat, and acetone vapor needs to be treated.

3. Hydrogen peroxide method

This method was developed by the French chemical company Jena Kurman. In 1979, an adult water-containing hydrazine device with an annual output of 5,000 tons (100%) was built. The method is that ammonia and concentrated H2O2 interact in the presence of methyl ethyl ketone, acetamide and disodium hydrogen phosphate to form methyl ethyl ketone nitrogen and water, which are then hydrolyzed to hydrazine hydrate under pressure. The yield of hydrazine is about 75% H 2 O 2. The method has no by-product sodium chloride, which is beneficial to simplifying the process and environmental protection, and the product is easy to separate and does not need to be refined. But in the methyl ketone nitrogen method, the chemical loss of methyl ethyl ketone is higher than that of acetone.

The technology of hydrazine hydrate and its new research

The main processes of hydrazine hydrate are Raschig method, urea method, ketone nitrogen method, double oxygen method and so on.

1.Rascheg

In the RAHI process, sodium hypochlorite is produced by the reaction of chlorine gas with sodium hydroxide, and then reacts with ammonia. The reaction temperature is controlled at about 5°C, and chloramine is rapidly formed. The reaction mixture product is mixed with excess ammonia. Its molar ratio is about 1:40. At 130°C~150°C and 3.0 MPa, hydrazine hydrate is formed at a low rate. When the reaction is discharged, under the condition that the pressure drops to atmospheric pressure, about 1% of hydrazine hydrate and about 4% of sodium chloride hydrate are evaporated in the evaporator, and the evaporated ammonia is condensed, concentrated and recycled. The solution at the bottom of the stripping tower enters the forced circulation salt evaporator, and the hydrazine hydrate is evaporated.

2. Urea method

The urea method is a method in which urea replaces ammonia to produce hydrazine hydrate. It is an improvement to the RAHI method and can simplify the equipment in the hydrazine hydrate production process. Firstly, sodium hypochlorite is synthesized, and then reacted with urea under the action of alkali to form isocyanate, and then hydrolyzed to form hydrazine and carbonate in wastewater.


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