Method for producing type I ammonium polyphosphate with high degree of polymerization

An ammonium polyphosphate, high degree of polymerization technology, applied in phosphates, phosphorus oxyacids, chemical instruments and methods, etc., can solve problems such as unfavorable industrialization promotion, harsh reaction conditions, high energy consumption, etc., and achieve easy control of the production process. , The color of the product is white, and the effect of effective use is realized.

Active Publication Date: 2009-09-02
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polyphosphoric acid is generally made from yellow phosphorus, there must be problems of high cost, high energy consumption, and high pollution
In addition, this method has a large heat release during the reaction process, the viscosity of the reaction sys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1000.0g of urea phosphate and 113.9g of urea were added to the reaction kettle, ammonia was passed through and mixed, and the materials were melted, foamed and polycondensed. The reaction temperature was 220°C, the reaction pressure was 0.06MPa, and the reaction time was 80 minutes. After finishing, the obtained product was pulverized to obtain I-type ammonium polyphosphate, the average degree of polymerization of the product was 56, and the ammonia-containing tail gas used 40% P 2 O 5 The wet-process phosphoric acid is absorbed to obtain ammonium dihydrogen phosphate.

Embodiment 2

[0020] 1000.0g of urea phosphate and 113.9g of urea were added to the reaction kettle, ammonia was passed through and mixed, and the materials were melted, foamed and polycondensed. The reaction temperature was 280°C, the reaction pressure was 0.1MPa, and the reaction time was 150 minutes. After finishing, the obtained product was pulverized to obtain I-type ammonium polyphosphate, the average degree of polymerization of the product was 145, and the ammonia-containing tail gas used 25% P 2 O 5 The wet purification of phosphoric acid is absorbed to obtain ammonium dihydrogen phosphate.

Embodiment 3

[0022] 900.0 g of urea phosphate, 100.0 g of ammonium dihydrogen phosphate, and 159.9 g of urea were added to the reaction kettle, followed by ammonia flow and mixing, and the materials were melted, foamed, and polycondensed. The reaction time was 140 minutes. After the reaction, the obtained product was pulverized to obtain I-type ammonium polyphosphate. The average degree of polymerization of the product was 109. After the ammonia-containing tail gas was treated with solid sodium hydroxide, it was returned to the reactor as an ammonia gas source.

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PUM

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Abstract

The invention discloses a method for producing type I ammonium polyphosphate with high degree of polymerization. The method comprises the following steps: using urea phosphate, ammonium dihydrogen phosphate and urea as raw materials, mixing, melting and foaming the raw materials, and performing a condensation reaction on the mixture in an ammonia atmosphere, wherein the mol ratio of the urea phosphate to the ammonium dihydrogen phosphate to the urea is 1: (0-5.5): (0.2-8.0), the reaction temperature is between 200 and 320 DEG C, the reaction pressure is between 0.06 and 0.12 MPa, the reaction time is between 60 and 150 minutes, reaction products are crushed to prepare the type I ammonium polyphosphate with high degree of polymerization, and ammonia-containing exhaust gas is recovered. The method is simple to operate and easy to implement with high degree of polymerization of the products, and is conducive to the popularization of industrialization.

Description

Technical field: [0001] The present invention relates to the production method of inorganic phosphorus-based flame retardant ammonium polyphosphate, in particular to the production method of high polymerization degree I type ammonium polyphosphate with urea phosphate, ammonium dihydrogen phosphate and urea as raw materials. Background technique: [0002] Ammonium polyphosphate (ammonium polyphosphate, abbreviated as APP) is an excellent flame retardant. Its phosphorus content and nitrogen content are high, so it has high flame retardant performance, good thermal stability, low solubility in water, the product is nearly neutral, and does not produce toxic and harmful gases such as chlorine and bromine during combustion. Halogen-free, low-smoke, low-toxicity environment-friendly flame retardant. [0003] For a long time, the production of I-type ammonium polyphosphate is mainly obtained by polycondensation reaction of 85% thermal phosphoric acid and urea, but thermal phosphor...

Claims

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Application Information

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IPC IPC(8): C01B25/40C01B25/28
Inventor 李进李光明王佳才邹建薛河南赵新越
Owner GUIZHOU CHANHEN CHEM CO LTD
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