SU712408A1 - Slowly acting nitrogen fertilizers - Google Patents

Description

one

The invention relates to agriculture, namely to slow-acting fertilizers that can be used, for example, on soils with excessive moisture.

It is known to use urea as a nitrogen fertilizer.

However, urea is highly soluble in water and quickly washed away from the soil, quickly decomposed by bacteria (urease enzyme) to carbon dioxide and free ammonia, which easily volatilizes or adversely affects the environment.

It is known the use of monoacylurea, obtained from C-C-monocarbonic acids, as slow-acting nitrogen fertilizers 2.

For the synthesis of these compounds, in addition to urea, acetic acid (96%), pure anhydrides or acid halides of the corresponding carboxylic acids are used as the starting products, which sharply increases the cost of the products obtained.

The aim of the invention is to expand the range of cheap, slow-acting nitrogen fertilizers.

The goal is achieved by using monoacylureas of the general formula:

NHoCONHP,

 where R is the .radyl radical of the normal structure with 5 to 6 carbon atoms,

as a slow-acting nitrogen fertilizer.

These compounds are obtained by condensation of urea with valeric acid or caproic acid 3.

In addition, a mixture of carboxylic acids (valeric and caproic) is produced in caprolactam production during side reactions at the stage of oxidation of cyclohexane to cyclohexanone and is considered a waste product. From concentrated waste, i.e. after evaporation of the water, it is extracted with a suitable solvent, for example benzene, carboxylic acids, then the solvent is distilled off. The resulting mixture can be used: 3 to produce fertilizers.

Data on the solubility of the proposed fertilizers. water at 18-25 ° C in comparison with the known are given in table. one.

1,200

Op 0.160

0.150

  -

0.020

also leaves area of plants. So, the total area of 10 sheets of corn in the control variant is 116 ± 1 cm, and in the experimental version - 12b ± 4 cm.

.Example2. In field experiments, capronoyl ureas and valerian ureas are affected by winter wheat and barley. Capronoylurea and valerianurea are obtained in the form of a mixture of caprolactam waste. The results are presented in table. four.

Table4

Claims (1)

^ Application of monoacylureas of the general formula NH ₂ C0NHR, where R is an acyl radical of normal structure with 5-6 carbon atoms as a slow-acting nitrogen fertilizer.