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Continuous production method of powdery and granular water-soluble ammonium polyphosphate

A water-soluble polymer production method technology, which is applied in the field of water-soluble fertilizer preparation, can solve the problems of unfavorable continuous product removal and inability to achieve continuous large-scale production, so as to overcome the difficulty of continuous material discharge, large production capacity, and chelation powerful effect

Active Publication Date: 2017-09-19
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is polymerized and solidified in a polymerizer with a conventional stirrer. The semi-product of ammonium polyphosphate after solidification is very easy to adhere to the wall of the reactor and the stirrer, which is not conducive to continuously taking out the product from the polymerizer. The whole production process is practical. For intermittent production, it is impossible to achieve continuous mass production

Method used

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  • Continuous production method of powdery and granular water-soluble ammonium polyphosphate
  • Continuous production method of powdery and granular water-soluble ammonium polyphosphate
  • Continuous production method of powdery and granular water-soluble ammonium polyphosphate

Examples

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Embodiment 1

[0043] A continuous production method of powdery water-soluble ammonium polyphosphate, the method specifically comprises the following steps:

[0044] 1) Pre-polymerization: Add phosphoric acid and urea to the pre-polymerizer 6 at a molar ratio of 1:1, and react at 140°C for 2 minutes to obtain liquid materials;

[0045] 2) Thermal polymerization and cooling: the liquid material is fed into the belt polymerizer 12 equipped with a heating zone and a cooling zone at a uniform speed. The temperature of the material in the heating zone is 170°C, and the residence time of the material in the heating zone is 30 minutes; the temperature of the circulating cooling water in the cooling zone is 12°C, and the residence time of the material in the cooling zone is 60 minutes. , to obtain solid material;

[0046] 3) Crushing: After the solid material is broken, the powdery water-soluble ammonium polyphosphate is obtained.

[0047] In step 2), such as figure 1 As shown, the belt polymeriz...

Embodiment 2

[0055] A continuous production method of powdery water-soluble ammonium polyphosphate, the method specifically comprises the following steps:

[0056] 1) Prepolymerization: Add urea phosphate and urea to the prepolymerizer 6 at a molar ratio of 1:1.5, and react at 60°C for 10 minutes to obtain liquid materials;

[0057] 2) Thermal polymerization and cooling: the liquid material is fed into the belt polymerizer 12 equipped with a heating zone and a cooling zone at a uniform speed. The temperature of the material in the heating zone is 220°C, and the residence time of the material in the heating zone is 5 minutes; the temperature of the circulating cooling water in the cooling zone is 7°C, and the residence time of the material in the cooling zone is 3 minutes. , to obtain solid material;

[0058] 3) Crushing: After the solid material is broken, the powdery water-soluble ammonium polyphosphate is obtained.

Embodiment 3

[0060] A continuous production method of powdery water-soluble ammonium polyphosphate, the method specifically comprises the following steps:

[0061] 1) Prepolymerization: Phosphorus sources (including phosphoric acid and urea phosphate) and urea were added to the prepolymerizer 6 at a molar ratio of 1:1.2, and reacted at 100°C for 5 minutes to obtain liquid materials;

[0062] 2) Thermal polymerization and cooling: the liquid material is fed into the belt polymerizer 12 equipped with a heating zone and a cooling zone at a uniform speed. The temperature of the material in the heating zone is 140°C, and the residence time of the material in the heating zone is 60 minutes; the temperature of the circulating cooling water in the cooling zone is 37°C, and the residence time of the material in the cooling zone is 30 minutes. , to obtain solid material;

[0063] 3) Crushing: After the solid material is broken, the powdery water-soluble ammonium polyphosphate is obtained.

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Abstract

The invention relates to a continuous production method of powdery and granular water-soluble ammonium polyphosphate. The method comprises steps as follows: 1) prepolymerization: a phosphorus source and urea are added to a prepolymerization device respectively and react at the temperature of 60-140 DEG C for 2-10 min, and a liquid material is obtained; 2) thermal polymerization and cooling: the liquid material is added to a belt type polymerizer provided with a heating zone and a cooling zone at a constant speed, and a solid material is obtained through heating, polymerization, cooling and curing sequentially; 3) crushing: powdery and granular water-soluble ammonium polyphosphate is obtained after the solid material is crushed. Compared with the prior art, the prepared viscous liquid material with proper flowability is prepared firstly, then, the liquid material sequentially passes by the heating zone and the cooling zone with movement of a driving belt, the solid material is obtained, continuous production of ammonium polyphosphate is realized, the problems such as the difficulty in continuous discharge, difficulty in crushing and the like in a conventional ammonium polyphosphate production process are solved, the production efficiency is high, and the product performance is easy to control.

Description

technical field [0001] The invention belongs to the technical field of water-soluble fertilizer preparation, and relates to a continuous production method of powdery water-soluble ammonium polyphosphate. Background technique [0002] Ammonium polyphosphate is also called ammonium polyphosphate or polycondensed ammonium phosphate (abbreviated as APP), and its structural formula can be written as (NH 4 ) n+ 2 P n o 3n+1 According to the degree of polymerization, it can be divided into two types: low poly and high poly. Among them, the APP with the degree of polymerization n between 2-20 is called oligomeric short-chain APP, which has water solubility; the APP with n>20 is long-chain APP, which has poor water solubility. When n>50, the molecular formula is approximately (NH 4 PO 3 )n. The degree of polymerization has a significant impact on the solubility of APP. The APP suitable for use as fertilizer is mainly water-soluble oligomeric short-chain APP with a degree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/40C05B7/00
CPCC01B25/405C05B7/00
Inventor 吴文华李接励袁宸梁济葛建国陈明良孔猛胡爽
Owner SHANGHAI RES INST OF CHEM IND
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