Production method of poly ammonium phosphate

A technology of ammonium polyphosphate and production method, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems affecting the implementation and popularization, difficult production control, slow reaction process, etc., to reduce production labor intensity, improve production conditions and environment small effect

Inactive Publication Date: 2005-08-10
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its slow reaction process, difficult production control, low yield and high energy consumption, it has affected the implementation and promotion of its industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] With the polyphosphoric acid of 1 weight part as raw material, polyphosphoric acid (H n+2 P n o 3n+1 ) purity (in H 3 PO 4 The percentage by weight) is 100%; add 1 part by weight of urea as a condensing agent, mix the two uniformly and then add them to a continuous synthesis reactor, and react for more than 210 minutes at 500°C and 0.35MPa to obtain 1 part by weight, white crystalline ammonium polyphosphate product with high purity (99.5%) and high degree of polymerization (n≥250).

Embodiment 2～ Embodiment 5

[0023] Except that described condensing agent is respectively selected from a kind of in ammonium bicarbonate, melamine, dicyandiamide, ammonium sulfate, other processes are the same as embodiment 1.

Embodiment 6

[0025] Except that described condensing agent adopts the mixture of urea and ammonium bicarbonate, urea 70%, ammonium bicarbonate is 30%, other process is the same as embodiment 1.

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PUM

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Abstract

A process for preparing ammonium polyphosphate includes such steps as proportionally mixing polyphosphoric acid with the condensating agent chosen from urea, ammonium dicarbonate, melamine, bicynoamine, ammonium sulfate and their mixture, and reacting at 100-500 deg.C under 0.01-0.35 MPa for 5-210 min.

Description

technical field [0001] The invention relates to a production method of ammonium polyphosphate, in particular to a production method of ammonium polyphosphate with high purity and high degree of polymerization. Background technique [0002] Ammonium polyphosphate is a nitrogen-containing polyphosphate. Different production methods and equipment are often used according to different uses of products. Most of the water-soluble products with a low degree of polymerization are used as fertilizers, and a small amount is used as flame retardants. High-purity and high-polymerization water-insoluble long-chain ammonium polyphosphate is used to prepare advanced fire-resistant coatings and flame-retardant plastics. At present, research in this field is mainly aimed at obtaining ammonium polyphosphate products with high polymerization degree, high purity, long chain, good compatibility and stable quality. [0003] In the prior art, the commonly used synthesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C08G83/00
Inventor 古思廉李云东马兆宁梅毅
Owner YUNNAN CHEM RES INST
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