A large particle urea and a method for preparing the same

Abstract

This invention belongs to the field of urea preparation technology and discloses a large-particle urea, composed of the following raw materials in a specific ratio: a 50% concentration of dilute urine solvent, a urokinase activity inhibitor, and a pigment, in a ratio of 100:6:5. This solution, through the careful design of the 50% concentration of dilute urine solvent, the urokinase activity inhibitor, and the pigment, enhances the soil dissolution rate and utilization rate. The addition of the urokinase activity inhibitor effectively inhibits the rapid hydrolysis of urea, reduces ammonia nitrogen loss, improves nitrogen utilization, mitigates negative environmental impacts, and contributes to soil ecological balance. The use of large-particle morphology and strict moisture control technology ensures the product's moisture resistance and storage stability, extending its shelf life. During production, the temperature is precisely controlled at 30℃, which avoids urine crystallization, ensures the full dissolution of the urokinase activity inhibitor, avoids odors generated at high temperatures, reduces environmental pollution, and improves the product's environmental friendliness.

Description

Technical Field

[0001] This invention belongs to the field of urea preparation technology, specifically a large-particle urea and its preparation method. Background Technology

[0002] Urea, a widely used nitrogen fertilizer, plays a vital role in agricultural production. Rich in nitrogen, it is an essential nutrient for plant growth. Traditionally, urea is typically available in granular or powder form and applied to the soil to provide crops with the necessary nitrogen. However, despite its important role in agricultural production, urea also has some significant drawbacks.

[0003] Poor nutrient composition and dissolution rate: Existing urea may not have an optimized nutrient composition, resulting in low nutrient absorption efficiency by crops. Its slow dissolution rate in the soil also affects urea utilization efficiency, preventing crops from obtaining sufficient nutrients in a timely manner.

[0004] Rapid hydrolysis and ammonia volatilization: Urea is prone to rapid hydrolysis during application, leading to a large amount of ammonia volatilization. This not only reduces nitrogen utilization efficiency but may also pose potential environmental hazards. Ammonia volatilization not only wastes nutrients but may also negatively impact soil and atmospheric environments, disrupting the harmonious balance of soil ecology.

[0005] Insufficient moisture resistance and storage stability: Existing urea products may lack sufficient moisture resistance, making them susceptible to moisture absorption in humid environments, leading to nutrient loss and performance degradation. Poor storage stability means the product may deteriorate during long-term storage, shortening its shelf life and increasing costs in agricultural production.

[0006] Improper temperature control strategies can lead to physical stability and odor issues: Existing urea production processes may lack proper temperature control strategies, causing crystallization and affecting the product's physical stability. Improper temperature control can also cause odor problems, such as NT odor, which not only affects the product's environmental friendliness but may also pollute the surrounding environment.

[0007] Therefore, design improvements are needed to address the aforementioned shortcomings. Summary of the Invention

[0008] The purpose of this invention is to provide a large-particle urea and its preparation method to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a large-particle urea, composed of the following raw materials in proportion: a 50% dilute urine solvent, a urokinase activity inhibitor, and a pigment, in a ratio of 100:6:5.

[0010] Preferably, the urokinase activity inhibitor is a powdered n-butylthiophosphoric acid triamine solid, and the large urea particles are plump, round, and brightly colored, possessing sustained-release function and color identification.

[0011] Preferably, the preparation method of this urea includes the following steps:

[0012] Step 1: Raw material preparation; Weigh out 50% diluted urine solvent, urokinase activity inhibitor, and pigment according to the specified proportions; Ensure that all raw materials are of qualified quality and meet production requirements;

[0013] Step 2, Mixing and Evaporation: Mix the dilute urine solvent, urokinase activity inhibitor, and pigment evenly to obtain a mixed solution; evaporate and concentrate the mixed solution to remove excess water, obtaining a urea solution containing high nitrogen nutrients, urokinase activity inhibitor, and pigment; temperature and pressure must be controlled during the evaporation process to ensure product quality;

[0014] Step 3, granulation; The treated urea solution is fed into a granulation tower for granulation; During the granulation process, the temperature, humidity and granulation speed parameters of the granulation tower need to be controlled to ensure the fullness and roundness of the particles;

[0015] Step 4, Post-processing: The large granulated urea particles obtained from granulation are dried to remove moisture from the surface of the particles; the dried particles are sieved to remove unqualified small particles and powder; the qualified particles after sieving are packaged to obtain the finished product; during the packaging process, attention should be paid to moisture prevention, damage prevention, and clear labeling.

[0016] Preferably, in the mixing process of step two, the temperature needs to be maintained at 30°C to prevent crystallization of 50% concentration urine, and also to ensure the heat required for the dissolution of the urokinase activity inhibitor, thus avoiding environmental pollution caused by the odor of the urokinase activity inhibitor due to excessively high temperatures.

[0017] Preferably, the pigment is, but is not limited to, a green pigment, to facilitate differentiation and identification.

[0018] Preferably, in the post-processing step four, the solid urea particles are first sent to a compound screening device for screening to remove small-diameter or dusty urea, and then sent to a gas-solid heat transfer dust removal device for cooling and dust removal.

[0019] Preferably, the compound screening device is provided with two layers of screens, which are arranged at an angle.

[0020] Preferably, the granulation is carried out by, but not limited to, tableting, drum granulation or spray drying.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention, through careful formulation containing 50% diluted urine solvent, urokinase activity inhibitor, and pigments, not only optimizes the nutritional composition of urea but also significantly enhances its dissolution rate and utilization efficiency in the soil. This innovative approach makes nutrient absorption by crops more efficient, thereby effectively reducing fertilizer application while significantly lowering the cost burden of agricultural production, and substantially improving fertilizer efficiency while reducing usage.

[0023] 2. This invention, through the ingenious integration of a urokinase activity inhibitor, effectively inhibits the rapid hydrolysis process of urea during application, significantly reducing the volatilization loss of ammonia. This change not only significantly improves nitrogen utilization efficiency but also reduces potential environmental hazards, making a positive contribution to maintaining the harmonious balance of soil ecology.

[0024] 3. This invention, by employing a large particle size and combining it with strict moisture control technology (strictly controlled within the national standard of 0.5%), endows the product with excellent moisture-proof performance and long-term storage stability. Even in humid environments, it can maintain its original performance, effectively extending the product's shelf life and significantly reducing nutrient loss caused by moisture.

[0025] 4. This invention mitigates the risks of crystallization and odor by optimizing temperature control strategies: During production, the temperature is precisely controlled at 30℃. This ingenious setting ensures that the 50% concentration of urine is well below its crystallization temperature (15℃), thus maintaining the physical stability of the product. Simultaneously, this temperature is sufficient to guarantee the complete dissolution of the urokinase activity inhibitor (NT inhibitor), eliminating the need for excessively high temperatures. This effectively avoids the NT odor that may result from high temperatures, further reducing pollution to the surrounding environment and significantly enhancing the product's environmental friendliness. Attached Figure Description

[0026] Figure 1 Experimental data to prove the present invention Figure 1 ;

[0027] Figure 2 Experimental data to prove the present invention Figure 2 ;

[0028] Figure 3 Experimental data to prove the present invention Figure 3 ;

[0029] Figure 4 Experimental data to prove the present invention Figure 4 ;

[0030] Figure 5 Experimental data to prove the present invention Figure 5 ;

[0031] Figure 6This is a flowchart illustrating the preparation process of the large-particle urea of ​​the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figures 1 to 6 As shown, this embodiment of the invention provides a large-particle urea, which is composed of the following raw materials in proportion: a 50% dilute urine solvent, a urokinase activity inhibitor, and a pigment, in a ratio of 100:6:5.

[0034] The urokinase activity inhibitor is a powdered n-butylthiophosphoric acid triamine solid, and the large urea particles are plump, round, and brightly colored, with sustained-release function and color identification.

[0035] The preparation method of this urea includes the following steps:

[0036] Step 1: Raw material preparation; Weigh out 50% diluted urine solvent, urokinase activity inhibitor, and pigment according to the specified proportions; Ensure that all raw materials are of qualified quality and meet production requirements;

[0037] Step 2, Mixing and Evaporation: Mix the dilute urine solvent, urokinase activity inhibitor, and pigment evenly to obtain a mixed solution; evaporate and concentrate the mixed solution to remove excess water, obtaining a urea solution containing high nitrogen nutrients, urokinase activity inhibitor, and pigment; temperature and pressure must be controlled during the evaporation process to ensure product quality;

[0038] Step 3, granulation; The treated urea solution is fed into a granulation tower for granulation; During the granulation process, the temperature, humidity and granulation speed parameters of the granulation tower need to be controlled to ensure the fullness and roundness of the particles;

[0039] Step 4, Post-processing: The large granulated urea particles obtained from granulation are dried to remove moisture from the surface of the particles; the dried particles are sieved to remove unqualified small particles and powder; the qualified particles after sieving are packaged to obtain the finished product; during the packaging process, attention should be paid to moisture prevention, damage prevention, and clear labeling.

[0040] In step two, the mixing process must be carried out at a temperature of 30°C to prevent crystallization of 50% urine concentration, and to ensure sufficient heat for the dissolution of the urokinase activity inhibitor, thus avoiding environmental pollution caused by the odor of the urokinase activity inhibitor due to excessively high temperatures.

[0041] The pigment used is, but is not limited to, green pigment, to facilitate differentiation and identification.

[0042] In the post-processing step four, the solid urea particles are first sent to a compound screening device for screening to remove small-diameter or dusty urea, and then sent to a gas-solid heat transfer dust removal device for cooling and dust removal.

[0043] The compound screening device is equipped with two layers of screens, which are arranged at an angle.

[0044] The granulation method is, but is not limited to, tableting, drum granulation, or spray drying.

[0045] Experimental data description:

[0046] This application records data reports from November 10, 2024 to December 27, 2024; four time points were selected each day to test and measure the following: biuret % (≤0.9%), moisture % (≤0.5%), (national standard) particle size % (2.00~4.75mm) ≥93%, (factory controlled) particle size % (2.80~4.75mm) ≥97.5%, total nitrogen % (≥46.0%), formaldehyde % (≤0.6%), and NT % (0.03%-0.07%).

[0047] Test results demonstrate that the large-particle urea prepared according to the proportions specified in this application ensures that the finished urea meets national standards, and the moisture content of the large particles can be controlled within 0.5% of the national standard. See the attached diagram in the instruction manual for details.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A type of large-particle urea, characterized in that: It is composed of the following raw materials in the following proportions: 50% diluted urine solvent, urokinase activity inhibitor, and pigment, in a ratio of 100:6:

5.

2. The large-particle urea according to claim 1, characterized in that: The urokinase activity inhibitor is a powdered n-butylthiophosphoric acid triamine solid. The large urea particles are plump, round, and brightly colored, and have a sustained-release function and color identification.

3. The method for preparing large-particle urea according to claims 1-2, characterized in that: The steps for preparing this urea are as follows: Step 1: Raw material preparation; Weigh out 50% diluted urine solvent, urokinase activity inhibitor, and pigment according to the specified proportions; Ensure that all raw materials are of qualified quality and meet production requirements; Step 2, Mixing and Evaporation: Mix the dilute urine solvent, urokinase activity inhibitor, and pigment evenly to obtain a mixed solution; evaporate and concentrate the mixed solution to remove excess water, obtaining a urea solution containing high nitrogen nutrients, urokinase activity inhibitor, and pigment; temperature and pressure must be controlled during the evaporation process to ensure product quality; Step 3, granulation; The treated urea solution is fed into a granulation tower for granulation; During the granulation process, the temperature, humidity and granulation speed parameters of the granulation tower need to be controlled to ensure the fullness and roundness of the particles; Step 4, Post-processing: The large granulated urea particles obtained from granulation are dried to remove moisture from the surface of the particles; the dried particles are sieved to remove unqualified small particles and powder; the qualified particles after sieving are packaged to obtain the finished product. During the packaging process, attention should be paid to moisture prevention, damage prevention, and clear labeling.

4. The method for preparing large-particle urea according to claim 3, characterized in that: In the mixing process of step two, the temperature needs to be maintained at 30°C to prevent crystallization of 50% concentration urine, and also to ensure the heat required for the dissolution of the urokinase activity inhibitor, avoiding environmental pollution caused by the odor of the urokinase activity inhibitor due to excessively high temperatures.

5. The large-particle urea according to claim 1, characterized in that: The pigment used is, but is not limited to, green pigment, to facilitate differentiation and identification.

6. The method for preparing large-particle urea according to claim 3, characterized in that: In the post-processing step four, the solid urea particles are first sent to a compound screening device for screening to remove small-diameter or dusty urea, and then sent to a gas-solid heat transfer dust removal device for cooling and dust removal.

7. The method for preparing large-particle urea according to claim 6, characterized in that: The compound screening device is equipped with two layers of screens, which are arranged at an angle.

8. The method for preparing large-particle urea according to claim 3, characterized in that: The granulation is carried out using, but is not limited to, tableting, drum granulation, or spray drying.

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