Manufacture of urea sulfur fertilizer
First Claim
1. A process for the production of a urea sulfur fertilizer by mixing urea and molten sulfur to obtain a molten mixture and solidifying the molten mixture to obtain a particulate urea sulfur fertilizer comprising passing the molten urea and the molten sulfur through a mixing device at a temperature above the melting points of the molten urea and the molten sulfur in amounts sufficient to produce said urea sulfur fertilizer, maintaining a pressure drop across said mixing device of at least about 200 kPa to form a homogenized melt of urea sulfur, and solidifying said homogenized melt to obtain a homogeneous, solid, particulate urea sulfur fertilizer wherein the sulfur has particle sizes of smaller than about 100 micron.
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Abstract
A process is disclosed for the production of a urea sulfur fertilizer by mixing urea and molten sulfur to obtain a molten mixture and solidifying the molten mixture to obtain a homogeneous, solid, particulate urea sulfur fertilizer wherein the sulfur has particle sizes of smaller than about 100 micron. The process comprises passing molten urea and molten sulfur through a mixing device at a temperature above the melting points to produce a finely divided sulfur dispersed in urea with the molten sulfur added in amounts sufficient to produce said urea sulfur fertilizer, maintaining a pressure drop across said mixing device of at least about 200 kPa to form a homogenized melt of urea sulfur, and solidifying said homogenized melt by prilling or agglomeration.
34 Citations
13 Claims
- 1. A process for the production of a urea sulfur fertilizer by mixing urea and molten sulfur to obtain a molten mixture and solidifying the molten mixture to obtain a particulate urea sulfur fertilizer comprising passing the molten urea and the molten sulfur through a mixing device at a temperature above the melting points of the molten urea and the molten sulfur in amounts sufficient to produce said urea sulfur fertilizer, maintaining a pressure drop across said mixing device of at least about 200 kPa to form a homogenized melt of urea sulfur, and solidifying said homogenized melt to obtain a homogeneous, solid, particulate urea sulfur fertilizer wherein the sulfur has particle sizes of smaller than about 100 micron.
- 2. A process for the production of a homogeneous, solid, particulate, urea sulfur fertilizer which comprises the steps of establishing a flow of molten urea at a temperature in the range of about 130 to 145 degrees C., establishing a flow of molten sulfur at a temperature in the range of about 120 to 150 degrees C., combining said flow of molten urea with said flow of molten sulfur, passing the combined flows through a mixing device, maintaining a pressure drop across said mixing device of at least about 200 kPa to form a homogenized melt of finely divided sulfur dispersed in urea, and solidifying the homogenized melt to obtain homogeneous, solid, particulate urea sulfur fertilizer wherein the sulfur has particle sizes smaller than about 100 micron.
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13. A homogeneous, solid, particulate urea sulfur fertilizer comprising a uniform dispersion of finely divided particles of sulfur in a urea matrix, said sulfur having particle sizes which are smaller than about 100 micron.
Specification