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Crystalline uric acid fertilizer and its prepn

A crystalline, fertilizer technology, applied in nitrogen fertilizers, fertilization devices, urea compound fertilizers, etc., can solve the problems of rising prices, little improvement in fertilizer performance, and insignificant improvement in utilization rate, and achieves reduction in volatilization loss and reduction. The effect of fertilization amount and increasing soil microbial population

Inactive Publication Date: 2004-03-17
UNIV OF SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

Although these products have changed the physical properties of the original urea, the urea basically still exists in its original molecule, and the performance of the fertilizer has not been greatly improved, resulting in an insignificant increase in its utilization rate, but the price has risen a lot. , failed to be widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 11

[0021] Example 11) Take 300g of commercially available urea and add it to a container containing 1500ml of aqueous solution, and stir evenly; 2) Take 300g of D-malic acid and add it to the container, and stir evenly; 3) Heat the above solution to 75°C and keep it warm for 90 minutes ; 4) Stop heating, and place it in air to cool for 2 hours to obtain crystals.

Embodiment 21

[0022] Example 21) Take 1000ml of 3% sulfuric acid solution in a container; 2) Take 600g of commercially available urea and add it to the above container and stir evenly; 3) Take 250g of DL-malic acid and add it to the container, and stir evenly; 4) Heat the above solution To 90°C, keep warm for 50-60 minutes; 5) Take it out and cool it to room temperature, and then place it at a low temperature of 5°C until crystals are obtained.

Embodiment 31

[0023] Example 31) prepare 10% sulfuric acid solution, take 2000mg in the container; 2) weigh 800g of urea and add it to the container and stir; 3) weigh 500g of L-malic acid and add it to the container and stir evenly; 4) heat to 100°C and continue 30 minutes; 5) Cool to room temperature, and place at a low temperature of about 1°C until crystals are obtained.

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Abstract

The crystalline uric acid fertilizer has, the X ray diffraction pattern, C and H nuclear magnetic resonance illustration and mass spectrum analysis shows, the molecular expression of C5H6N2O4. The preparation process includes mixing urea, sulfuric acid solution and malic acid; heating to 70-100 deg.c, and cooling to crystalline state. The product has high fertilizer effect, small consumption and capacity of improving the physical, chemical and biological performance of soil, and is especially suitable for application in tobacco field.

Description

technical field [0001] The invention relates to an agricultural uric acid crystalline fertilizer and a preparation method thereof. Background technique [0002] Urea has the characteristics of high N content and fast fertilizer efficiency, so it is widely used in agricultural production. Over the years, due to the single or partial application of urea, the acidification and compaction of the land, the deterioration of the structure, and the thinning of the cultivated layer have become increasingly serious. In order to maintain a good harvest, farmers have to increase the amount of fertilizer, which results in a vicious circle. On the other hand, the extensive use of urea seriously pollutes the atmosphere and water environment due to losses such as loss, volatilization, and denitrification. For a long time, people have been trying to improve the utilization rate of urea to reduce its consumption and reduce its adverse impact on the environment. For example, foreign countri...

Claims

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Application Information

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IPC IPC(8): C05C9/00
Inventor 刘义新韩移旺王彦亭江玉平于黎莎
Owner UNIV OF SCI & TECH OF CHINA
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