Method for preparing ammonium potassium polyphosphate from acid monopotassium phosphate

A technology of acid potassium dihydrogen phosphate and potassium dihydrogen phosphate, applied in the direction of ammonium orthophosphate fertilizer, chemical instruments and methods, alkaline orthophosphate fertilizer, etc., can solve the problem of low solubility, low nutrient concentration and harsh production conditions and other problems, to achieve the effect of simple preparation method, high nutrient concentration and good water solubility

Active Publication Date: 2020-06-05
CHANHEN ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation method, phosphorus pentoxide with high cost is used as the raw material for preparation, which leads to high production cost and is unfavorable for market promotion.
[0006] In summary, the existing methods for preparing potassium ammonium polyphosphate all have the defects of complex production process, harsh production conditions, low nutrient concentration, low solubility or high production cost

Method used

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  • Method for preparing ammonium potassium polyphosphate from acid monopotassium phosphate
  • Method for preparing ammonium potassium polyphosphate from acid monopotassium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Get 1000g of acid potassium dihydrogen phosphate for reaction, add 150g of urea and mix evenly, pour the mixed material into the polymerizer, this polymerizer is a reaction tank with a jacket, and heat medium is passed into the jacket for indirect heating, Provide the heat required for polymerization. The polymerizer is also equipped with a high-speed stirrer to play the role of defoaming and mixing. The temperature inside the polymerizer is controlled at 140°C. As the material polymerizes and solidifies, the reaction continues for 2 hours. Take it out, cool it, and pulverize it. get the product. The product has good water solubility, the solubility in water at 25°C can reach 187g / 100g water, and the aqueous solution is completely clear after dissolution.

Embodiment 2

[0054] Take 1000 g of acid potassium dihydrogen phosphate for reaction, add 300 g of urea and mix evenly, pour the mixed slurry into the polymerizer, the polymerizer is the same as in Example 1, control the temperature in the polymerizer to 160 ° C, and the material is polymerized and solidified After that, continue to react for 2 hours, take it out, cool it, and pulverize it to get the product. The product has good water solubility, and the solubility in water at 25°C can reach 162g / 100g water, and the aqueous solution is completely clear after dissolution.

Embodiment 3

[0056] Take 1000 g of acid potassium dihydrogen phosphate for reaction, add 100 g of urea and mix evenly, pour the mixed slurry into the polymerizer, the polymerizer is the same as in Example 1, control the temperature in the polymerizer to 160 ° C, and the material is polymerized and solidified After that, continue to react for 2 hours, take it out, cool it, and pulverize it to get the product. The product has good water solubility, the solubility in water at 25°C can reach 166g / 100g water, and the aqueous solution is completely clear after dissolution.

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Abstract

The invention provides a method for preparing ammonium potassium polyphosphate from acid potassium dihydrogen phosphate, which comprises the following steps: mixing acid potassium dihydrogen phosphateand a condensing agent, and heating to perform polymerization reaction to obtain ammonium potassium polyphosphate, wherein the mass ratio of the acid potassium dihydrogen phosphate to the condensingagent is 20:(1-10), and the temperature of the polymerization reaction is 140-200 DEG C. The preparation method disclosed by the invention is simple and convenient, wherein the reaction temperature isonly 200 DEG C at most, and extra ammonia is not required. The preparation method is carried out under a normal pressure condition and is free of high-temperature and high-pressure special equipment,so that the high-quality potassium ammonium polyphosphate fertilizer can be produced by only adopting common chemical equipment and chemical raw materials, and the market prospect is very good. The total nutrient N + P2O5 + K2O of the potassium ammonium polyphosphate product prepared by the preparation method is greater than 85% and the polymerization degree is 2-20, so that the potassium ammonium polyphosphate product has good water solubility, and the polymerization rate is greater than 95%.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizer production, and in particular relates to a method for preparing potassium ammonium polyphosphate from potassium dihydrogen phosphate. Background technique [0002] Fertilizer is an important material in agricultural production and an important means to ensure the increase of crop yield. Under the requirement of ensuring the normal fertilizer demand of crops, how to improve the utilization efficiency of chemical fertilizers is not only related to the stable and high yield of grain, but also related to environmental protection. At present, under the background of "reducing volume and increasing efficiency" in the fertilizer industry, various high-efficiency fertilizers and slow-release fertilizers emerge in endlessly. Among them, potassium ammonium polyphosphate (also known as potassium ammonium polyphosphate) is favored for its comprehensive nutrition, good water solubility and hig...

Claims

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Application Information

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IPC IPC(8): C01B25/45C05B7/00C05G3/40
CPCC01B25/451C05B7/00C05G3/00C05D5/00C05D9/02
Inventor 雷波袁海斌马永强王成文陈仕林简路明
Owner CHANHEN ECO TECH CO LTD
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