MIXTURE CONTAINING 3,4-DIMETHYLPYRAZOLE AND USE THEREOF

Abstract

A mixture comprising 20% to 35% by weight of water and 15% to 19% by weight of 3,4-dimethylpyrazole, based on the overall mixture that adds up to 100% by weight, and phosphoric acid in a molar ratio to 3,4-dimethylpyrazole of at least 1:1 is used for coating of nitrogen-containing fertilizers.

Claims

1.-14. (canceled)

15. A mixture comprising 22.0% to 32.0% by weight of water and 15% to 19% by weight of 3,4-dimethylpyrazole, based on the overall mixture that adds up to 100% by weight, and phosphoric acid in a molar ratio to 3,4-dimethylpyrazole of at least 2:1.

16. The mixture as claimed in claim 15, characterized in that it contains 16.0% to 18.0% by weight, based on the overall mixture that adds up to 100% by weight, of 3,4-dimethylpyrazole.

17. The mixture as claimed in claim 15, characterized in that it contains water in an amount of 25.0% to 30.0% by weight, based on the overall mixture that adds up to 100% by weight.

18. The mixture as claimed in claim 15, characterized in that it consists of water, 3,4-dimethylpyrazole, phosphoric acid and 0% to 10% by weight of further additions, based on the overall mixture that adds up to 100% by weight.

19. The mixture as claimed in claim 18, characterized in that it consists of 25.0% to 30.0% by weight of water, 17.0% to 17.8% by weight of 3,4-dimethylpyrazole, phosphoric acid and 0.1% to 2% by weight of dye and 0% to 5% by weight of further additions, based on the overall mixture that adds up to 100% by weight.

20. A process for producing a mixture as claimed in claim 15 by introducing 3,4-dimethylpyrazole, phosphoric acid and optionally further additions into water and mixing the substances introduced into water.

21. A process for the stabilization of liquid manure or liquid fertilizer formulations, including the step of adding a mixture as claimed in claim 15 to the liquid manure or liquid fertilizer formulation.

22. A process for producing stabilized ammonium nitrogen-containing fertilizer powders, granules, chips, tablets or extrudates, characterized in that a mixture as claimed in claim 15 is applied to ammonium nitrogen-containing fertilizer powder, granules, chips, tablets or extrudates and distributed uniformly over the fertilizer surface.

23. The process as claimed in claim 22, characterized in that the applying is effected by spray application, drum application or impregnation, where the fertilizer is moved mechanically to homogenize the application and is dried after the application.

24. The process as claimed in claim 22, characterized in that the mixture is applied to the fertilizer in such an amount that the amount of 3,4-dimethylpyrazole, based on the ammonium nitrogen in the fertilizer, is at least 0.4% by weight.

25. The process as claimed in claim 24, characterized in that the mixture is applied to the fertilizer in such an amount that the amount of 3,4-dimethylpyrazole, based on the ammonium nitrogen in the fertilizer, is 0.4 to 1.4% by weight.

Description

EXAMPLES

Example 1: Creation of the Mixture

[0056] 3,4-Dimethylpyrazole and phosphoric acid and a dye in an amount of 5% by weight based on 3,4-dimethylpyrazole are introduced into water and mixed by stirring. The mixture contains 17.4% by weight of DMP, 27.3% by weight of water and, as the remainder (55.3% by weight), phosphoric acid in a greater than equimolar amount (excess). The dye is added to this mixture in the amount specified.

Example 2: Coating of Fertilizers

[0057] For every tonne of different ammonium nitrogen-containing fertilizer, the following amounts of DMPP formulation from example 1 with a DMPP content of 34.8% by weight, optionally additionally further additional phosphoric acid and dye are used:

TABLE-US-00001 kg DMPP 34.8% kg H3PO4 kg dye kg total 5.26 0.00 0.06 5.32 5.67 0.00 0.06 5.73 2.97 1.76 0.07 4.80

[0058] The result was a fertilizer having a content of 0.80% by weight of DMPP, based on ammonium nitrogen.

[0059] Owing to the different ammonium nitrogen content of the individual fertilizers, the proportion of DMPP per tonne of fertilizer in the above examples, from the top downward, is 0.148% by weight, 0.168% by weight and 0.088% by weight respectively. The result in each case was uniform application of the DMPP to the entire fertilizer surface.

[0060] The addition of phosphoric acid in the case of the third fertilizer with a low nitrogen content gave a total amount suitable for uniform application without any risk of partial dissolution of the fertilizer by addition of water.

Example 3

[0061] The application rates of the mixture from ex. 1 stated below, calculated on the basis of DMP, were applied to different fertilizers:

TABLE-US-00002 Fertilizer kg/t DMP Urea 1.8-9.5 15 + 15 + 15 S 0.4-3.0 AS 1.0-6.7

[0062] In all cases, there was uniform application of the DMPP to the fertilizer. There was no partial dissolution and also no caking of the fertilizer in the course of coating, subsequent drying or storage.

Comparative Example 4

[0063] An increase in the DMP concentration in the solution to 20% by weight led to precipitation of the DMPP after several days. On application to fertilizer with a low ammonium content, defects were found (nonuniform application).

[0064] A reduction in the DMP concentration to 13% by weight, especially in the case of application to fertilizer with a high ammonium content, led to partial surface dissolution of the granules.