CS264560B1 - Method of treatment of sulfur for agricultural purposes - Google Patents

Abstract

The method of treating sulfur consists in melting sulfur in a liquid medium of substances containing at least one amide or amine or imine group, after melting the sulfur, the mixture is cooled again to room temperature, while the mixture is treated with a disintegrator, for example ultrasound, during the melting and/or solidification period.

Description

At present, sulfur is used in agriculture to eliminate fungi and other diseases, which is variously repaired to obtain the finest crystals or colloids to be biologically effective. Sulfur produced hitherto is sometimes not efficient enough and sometimes harms the plant due to undesirable accompanying substances on its surface, such as acid residues or chemicals used to decompose salt for sulfur production.

These shortcomings are overcome by the sulfur treatment method of the invention. The essence of the invention is that. The sulfur is melted in a liquid medium of substances containing at least one amide or amino or imido or amino group. After the sulfur has melted, the mixture is cooled again to room temperature, and the mixture is treated with a disintegrator, for example ultrasound, during the melting and / or solidification of the sulfur.

The process according to the invention removes gases sorbed in

on the sulfur surface and allows a spherical shape to be achieved. According to the invention, the treated sulfur has a spherical shape, which is obtained by vibrating the molten sulfur in an auxiliary liquid phase, for example a urea melt, with a disintegrator, for example by ultrasound. Both melting of the sulfur and ultrasound will cause removal of undesirable gases on the sulfur surface. Molecules from the liquid medium in which the sulfur is melted are sorbed onto the vacant spots on the sulfur surface. For agricultural purposes, liquids having at least one or more amido- or amino- or imido- or imino- group are used, for example urea, urea derivatives, biuret, piperazine, semicarbazide and so on. Cooling the sulfur solution, e.g. aqueous

264 560 of molten sulfur urea solution or ultrasonic melt of urea with sulfur results in the presence of spheres of sulfur in the form of spheres upon cooling. The size of the beads is a function of the temperature, the auxiliary liquid phase used, the intensity and frequency of the disintegrator, and the cooling rate. Sulfur produced according to the invention · / In fact, the sulfur is perfectly wetted by the liquid or solid phase with the Great Surface. Sulfur treated in this way has high biological activity and does not harm the plants.

Example 1

The sulfur powder is melted with urea to a temperature above the melting point of the sulfur until substantial deaeration, degassing and melting of the sulfur is achieved. Ultrasonication removes the last gas residue and at the same time disintegrates the liquid sulfur, which in the form of beads is dispersed in the urea. After cooling the urea, which is carried out under the constant action of the disintegrator, the melt contains bead sulfur which has remained unchanged in this environment for at least two years and has no significant odor.

Example 2

Sulfur powder was added to the urea solution in water.

The mixture was heated until the sulfur had melted. Heating and liquefaction of the sulfur was followed by cooling under ultrasound. While the sulfur is in liquid form and is degassed from the preceding phase, ultrasonic treatment is not necessary. The product obtained was stored as a dry substance or dissolved in degassed water, optionally containing urea.

Example 3

Molten sulfur in a liquid containing at least two hydroxyl groups, for example glycerol, which has been degassed before, is poured into a solution of urea in water or urea melt. This is followed by disintegration of sulfur by ultrasound in urea, cooling under the action of a disintegrator. The biologically active sulfur thus prepared has a spherical shape and is stable for more than two years. It is biologically active, no adverse effects have been observed such as are sometimes seen with the use of otherwise produced sulfur.

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264 560

Example 4

Sulfur powder was added to a solution of piperazine in water. Heating and liquefaction of the sulfur was followed by cooling under ultrasound. The product obtained was stored as a dry substance.

Claims (4)

p e τ v n n n. Process for treating sulfur for agricultural purposes, characterized in that the sulfur is melted in a liquid medium of substances containing at least one amide or amine or imide or imino group, after the melting of the sulfur, the mixture is cooled again to room temperature, during the melting and / or solidification of the sulfur, they act by disintegrating, for example by ultrasound. 2. A process according to claim 1, wherein the liquid medium comprises at least two amide groups in the melt or aqueous solution state. 3. A process as claimed in claim 1 or 2, characterized in that water containing compounds which raise the boiling point of the aqueous solution to a temperature of > than the sulfur melting point. 4. Process according to claim 1, characterized in that the treated sulfur is stored in a liquid medium or in a melt, preferably water or alcohol soluble.