The comparison of different production processes of hydrazine hydrate?

More traditional hydrazine hydrate production technology, is our company's main production technology. Hydrazine hydrate with 80% content was obtained by further multistage distillation from crude hydrazine synthesized by urea and liquid alkali.

1. Urea oxidation method
More traditional hydrazine hydrate production technology, is our company's main production technology. Hydrazine hydrate with 80% content was obtained by further multistage distillation from crude hydrazine synthesized by urea and liquid alkali. The process is mature and the quality is stable. The disadvantage is that compared with other processes, the energy consumption is relatively large, the cost is slightly higher.

2. ketoazide process
Ketoazide method is a new technology developed abroad in 1970s. In this method, ammonia is oxidized with chlorine or sodium hypochlorite in the presence of excessive acetone to produce methylene azide, and then hydrolyzed under pressure to obtain hydrazine. The advantages of this method are high yield, about 95%, and low energy consumption. The disadvantage is that the addition of acetone, so that there are organic by-products in the system, containing ketone wastewater harm is greater, the treatment is very difficult, and acetone steam needs to be treated.

3. Hydrogen peroxide method
This method was developed by the French chemical company Huyna-Kuhlmann. In 1979, the plant with an annual output of 5000 tons (100%) water containing hydrazine was built. This method is based on the interaction between ammonia and concentrated H2O2 in the presence of methyl ethyl ketone, acetamide and disodium hydrogen phosphate to produce methyl ethyl ketone with nitrogen and water, and then hydrolyzed to hydrazine hydrate under pressure. The yield of hydrazine is about 75% as measured by H2O2. This method does not have sodium chloride as a by-product, which is beneficial to simplify the process and environmental protection. Moreover, the product is easy to dissolve and separate without rectification. However, the chemical loss of methyl ethyl ketone is higher than that of acetone by methyl ketone azotization.