RU2628582C1 - Method of producing herbicidal agent - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: method of producing a herbicidal agent by mechanochemical interaction of equimolecular amounts of a trialkylamine, in which, at least, one alkyl radical contains, at least, eight carbon atoms and glyphosate, the reaction being carried out in the presence of water. The reaction mass contains from 0.05 to 1 mole of water relative to the equimolecular amount of the trialkylamine and glyphosate.

EFFECT: invention allows to creat a herbicidal agent, which is a modification of glyphosate, with improved performance properties.

2 cl, 4 tbl

Description

This invention relates to agriculture and can be used to combat weed and unwanted vegetation in crops.

It is known (RU 2482676, publ. 27.05.2013) that dimethylalkyl (C> 8) - an amine salt (hereinafter DMAA salt) of N-phosphonomethylglycine (hereinafter glyphosate) (hereinafter DMAA salt of glyphosate) - has bifunctional properties (biological and surface activity) , which allows it to be used for the purpose of weed control in its pure form without the addition of any additional components.

Closest to the proposed invention is the solution according to patent RU 2356229 (publ. 05/27/2009, bull. No. 15), where the trialkylamine salt of N-phosphonomethylglycine (hereinafter TAA glyphosate salt), in which the alkyl groups are normal or isostructure and contain from 1 to 20 carbon atoms are obtained by mechanochemical interaction of equimolar amounts of trialkylamine, used individually or in a mixture, where the alkyl groups are of normal or iso construction and contain from 1 to 20 carbon atoms, and glyphosate in a Z-shaped mixer.

In practice, the only drawback of this method of producing said glyphosate salt is the quality of the resulting product.

The extremely low bulk density of TAA glyphosate salts creates problems both in its production and packaging, and in use.

An object of the present invention is to provide a herbicidal agent which is a modification of glyphosate with improved performance properties.

The solution of this problem is achieved by the fact that the method of obtaining the herbicidal agent is carried out by means of mechanochemical interaction of equimolecular amounts of trialkylamine, in which at least one alkyl radical contains at least eight carbon atoms and glyphosate, the interaction being carried out in the presence of water. The reaction mass contains from 0.05 to 1 mole of water with respect to the equimolecular amount of said trialkylamine and glyphosate. In addition, water is pre-mixed with the specified trialkylamine.

The resulting reaction product is a crystalline hydrate of the indicated trialkylamine salt of glyphosate having a bulk density four times greater than that of the trialkylamine salt of glyphosate obtained without adding water.

In the study of the role of water in the mechanochemical interaction of trialkylamine, in which at least one alkyl radical contains at least eight carbon atoms, with glyphosate, it was found that with an increase in the amount of water up to the equimolecular one, the rate of formation of the TAA salt of glyphosate increases.

The results of the experimental data on the formation of TAA glyphosate salt by mechanochemical interaction of the indicated trialkylamine with glyphosate in the presence of different amounts of water at ambient temperature and the time required to achieve the powder state of the final product are given in table. one.

Such a significant difference in time to reach the powder state of the final product depending on the amount of water is explained by the different energy state of the molecules of the above trialkylamine. If in the absence of water the formation of the TAA glyphosate salt occurs as a transfer of the proton of the carboxyl group to the nitrogen atom of tertiary alkylamine, then in the presence of water there is a process of solvation of water molecules with trialkylamine to form a more energy-efficient structure than trialkylamine, which is clearly seen when comparing examples 1, 4, 5.

The quality assessment of TAA salts of glyphosate (bulk) in examples 1-5, confirming the essence of this invention, are given in table. 2.

As follows from the data table. 2, a sufficiently substantial increase in the bulk density of TAA of glyphosate salt as water is added to the reaction mass up to an equimolecular amount clearly indicates that water remains in the final product, most likely in the form of crystalline hydrate.

This is finally confirmed by the experimental results, when a slight excess of water against the equimolecular leads to a loss of flowability of the TAA glyphosate salt and its moistening (Table 3).

Thus, the present invention, depending on the characteristics of the production and use of the herbicidal agent in the form of a TAA glyphosate salt, in which at least one alkyl radical contains at least eight carbon atoms, makes it possible to obtain a TAA glyphosate salt with a bulk density most convenient for the manufacturer and consumer, depending on the amount of water used in the production. However, its amount is limited to an equimolecular content with respect to glyphosate and trialkylamine.

As expected, the quality of the working liquids is not related to the amount of water in the reaction mass (Table 4).

Claims (2)

1. A method of obtaining a herbicidal agent by mechanochemical interaction of equimolecular amounts of trialkylamine, in which at least one alkyl radical contains at least eight carbon atoms, and glyphosate, characterized in that the interaction is carried out in the presence of water, while the reaction mass contains from 0.05 up to 1 mol of water in relation to the equimolecular amount of trialkylamine and glyphosate. 2. The method according to p. 1, characterized in that the water is pre-mixed with the trialkylamine indicated in p. 1.