Ammonium polyphosphate water soluble fertilizer and preparation method thereof

A water-soluble fertilizer and ammonium polyphosphate technology, which is applied in the direction of phosphate, phosphorus oxyacid, fertilizer mixture, etc., can solve the problem that ammonium polyphosphate is not suitable for agricultural water-soluble fertilizers, is not suitable, and ammonium polyphosphate is low Water solubility and other issues, to achieve the effect of low production cost, high effective content and good water solubility

Active Publication Date: 2014-05-14
广西泰宝生物科技有限公司
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  • Abstract
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Problems solved by technology

[0006] Chinese patent CN103073750A introduces a formaldehyde-free low water-soluble ammonium polyphosphate product and its preparation method. The ammonium polyphosphate prepared by this method is not suitable for agricultural water-soluble fertilizers due to its low water solubility.
[0007] Chinese patent CN103058161A has introduced a kind of ammonium-deficient crystalline type II ammonium polyphosphate product and its preparation method, but the ammonium polyphosphate prepared by this method is also not suitable for agricultural water-soluble fertilizer use
[0008] The ammonium polyphosphate prepared by the above-mentioned method is all unsuitable for the ammonium polyphosphate water-soluble fertilizer that needs in the production agriculture, therefore researches and develops the preparation method of novel ammonium polyphosphate, makes the ammonium polyphosphate of preparation keep nitrogen-containing, Based on the characteristics of high phosphorus content, good water solubility is an urgent problem to be solved in the production of ammonium polyphosphate water-soluble fertilizer

Method used

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  • Ammonium polyphosphate water soluble fertilizer and preparation method thereof
  • Ammonium polyphosphate water soluble fertilizer and preparation method thereof
  • Ammonium polyphosphate water soluble fertilizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Add 18kg of 85% phosphoric acid, 22kg of urea, 18.6kg of potassium sulfate and 29kg of auxiliary materials in a 50L autoclave, mix and dissolve in the kettle, then add 3.6kg of phosphorus pentoxide and stir evenly. Under stirring, the temperature of the reactor was raised to 180°C, and the reaction was carried out for 30 minutes, and then the temperature was raised to 200°C for 1.5 hours. During the reaction process, the partial pressure of ammonia is controlled at 3±0.2MPa. After the reaction is completed, the temperature in the reactor is gradually lowered, and at the same time, the ammonia gas produced by the reaction is absorbed with dilute phosphoric acid solution, and the ammonium polyphosphate-potassium sulfate water-soluble fertilizer can be obtained. . The product index is shown in Table 1.

Embodiment 2

[0032] Add 19kg of 80% phosphoric acid, 24.3kg of urea, 18kg of potassium sulfate and 32kg of auxiliary materials in sequence in a 50L high-pressure reactor, then add 3.8kg of phosphorus pentoxide and stir evenly. Under stirring, the temperature of the reactor was raised to 185°C, and the reaction was carried out for 40 minutes, and then the temperature was raised to 205°C for 2 hours. During the reaction process, the partial pressure of ammonia is controlled at 3±0.2MPa. After the reaction is completed, the temperature in the reactor is gradually lowered, and at the same time, the ammonia gas produced by the reaction is absorbed with dilute phosphoric acid solution, and the ammonium polyphosphate-potassium sulfate water-soluble fertilizer can be obtained. . The product index is shown in Table 1.

Embodiment 3

[0034] Add 19.2kg of 82% phosphoric acid, 25kg of urea, 18.7kg of potassium sulfate and 36kg of auxiliary materials in sequence in a 50L high-pressure reactor, then add 3.9kg of phosphorus pentoxide and stir evenly. Under stirring, the temperature of the reactor was raised to 182°C, and the reaction was carried out for 45 minutes, and then the temperature was raised to 203°C for 1.8 hours. During the reaction process, the partial pressure of ammonia is controlled at 3±0.2MPa. After the reaction is completed, the temperature in the reactor is gradually lowered, and at the same time, the ammonia gas produced by the reaction is absorbed with dilute phosphoric acid solution, and the ammonium polyphosphate-potassium sulfate water-soluble fertilizer can be obtained. . The product index is shown in Table 1.

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Abstract

The invention belongs to the field of fertilizers and particularly relates to an ammonium polyphosphate water soluble fertilizer and a preparation method thereof. The preparation method comprises the following steps: adding phosphoric acid, urea, potassium sulphate, zinc chloride, copper chloride, borax and auxiliaries into a reaction kettle, mixing and dissolving in the kettle, then adding phosphorus pentoxide and uniformly stirring; heating the reaction kettle to 180-185 DEG C while stirring, reacting for 30-45 minutes, and then heating to 200-205 DEG C to react for 1.5-2 hours; and after the reaction is finished, reducing the temperature in the reaction kettle to room temperature, and simultaneously absorbing ammonia gas generated by reaction by using a diluted phosphoric acid solution to obtain the ammonium polyphosphate water soluble fertilizer. The ammonium polyphosphate-potassium sulfate water soluble fertilizer prepared by the preparation method has the characteristics of good water solubility, low impurity content and high effective contents of nitrogen, phosphorus and potassium. The preparation method disclosed by the invention has the advantages of simplicity, practicality, low production cost and the like.

Description

technical field [0001] The invention belongs to the field of fertilizers, and in particular relates to a water-soluble ammonium polyphosphate fertilizer and a preparation method thereof. Background technique [0002] Ammonium polyphosphate (hereinafter referred to as APP) has the following general structural formula: (NH4) n+2 P n o 3n+1 , is a kind of polyphosphate containing nitrogen and phosphorus. According to its degree of polymerization, it can be divided into three types: low polymerization, medium polymerization and high polymerization. The higher the degree of polymerization, the lower the water solubility. According to its structure, it can be divided into crystalline form and amorphous form. The crystalline ammonium polyphosphate is a long-chain water-insoluble polyphosphate. [0003] Recently, ammonium polyphosphate has gradually entered the production field of compound fertilizer and liquid fertilizer, and has been widely used especially in developed countrie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/06C01B25/28
Inventor 周峰苗志伟胡辰飞潘克静郑香军
Owner 广西泰宝生物科技有限公司
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