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Method for producing ammonium polyphosphate by utilizing phosphoric acid and urea

A technology of ammonium polyphosphate and urea, applied in chemical instruments and methods, phosphorus compounds, non-metallic elements, etc., can solve the problems of short production process, high raw material requirements, and a large amount of industrial waste, and achieve high polymerization degree and high purity Effect

Active Publication Date: 2020-02-07
中化重庆涪陵化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the above methods, except for the two methods 3 and 5, it is impossible to produce high-purity, water-insoluble and low-hygroscopic products for flame retardants. However, the presence of sulfur in the third method is unfavorable for use as a flame retardant material, while the fifth method has a short production process and no three wastes, but has high requirements for raw materials, especially the preparation of phosphorus pentoxide from yellow phosphorus Obtained through high temperature and drying process, under high temperature conditions, it will consume a lot of energy and produce a lot of industrial waste, and special attention should be paid when handling phosphorus pentoxide, because it has strong hygroscopicity and reactivity, Therefore, there is a certain danger to the human body

Method used

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  • Method for producing ammonium polyphosphate by utilizing phosphoric acid and urea
  • Method for producing ammonium polyphosphate by utilizing phosphoric acid and urea

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1, such as figure 1 Shown, a kind of system that utilizes phosphoric acid and urea to produce ammonium polyphosphate comprises a first reaction tank 1, and the feed port of this first reaction tank 1 is connected with phosphoric acid material source and urea material source, and described first reaction tank 1 The discharge port of the reactor is connected with a polymerization kettle 2, a kneader 3, a pulverizer 29 and a screening machine 30 successively, wherein the air inlet of the kneader 3 is connected with an ammonia addition pipe 4, and the polymerization kettle 2 is provided with an ammonia supplement port .

[0030] The phosphoric acid source includes a phosphoric acid tank 11, the outlet of the phosphoric acid tank 11 is connected to the feed port of the first reaction tank 1 through a phosphoric acid feed pipe 12, and the phosphoric acid feed pipe 12 is provided with a first delivery pump 13. The second solenoid valve 15 and the first flowmeter 14. T...

Embodiment 2

[0036] Example 2, such as figure 1 Shown, a kind of method that utilizes the system described in embodiment 1 to produce ammonium polyphosphate, carry out according to the following steps:

[0037] ① Put urea and phosphoric acid into the first reaction tank 1 to react at a molar ratio of 1:0.5, and control the opening and closing of the third solenoid valve 21 through the feedback of the first temperature controller 23, and control the reaction temperature in the first reaction tank to 80 ℃, stirred to form a clear and transparent solution, to obtain a mixed solution of urea phosphate and urea, if the first liquid level controller 22 monitors that the liquid level in the first reaction tank 1 reaches the preset value, the preset value is fed back to the belt metering Weighing 17, stop or slow down the delivery of urea to the first reaction tank 1, while the frequency converter controls the first delivery pump 13 to stop or slow down the delivery of phosphoric acid to the first...

Embodiment 3

[0055] Embodiment 3, a kind of method that utilizes the system described in embodiment 1 to produce ammonium polyphosphate, the difference between this embodiment and embodiment 2 is: the molar ratio of urea and phosphoric acid in step 1. is 1:0.8, and temperature is 100 °C; the first polymerization temperature in step ② is 330 °C for 1.5 hours; the second polymerization time in step ③ is 1 hour.

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Abstract

The invention discloses a method for producing ammonium polyphosphate by utilizing phosphoric acid and urea. After the urea and the phosphoric acid are reacted according to the proportion, an obtainedmixture of urea phosphate and the urea is polymerized for two times under an ammonia atmosphere so as to obtain the ammonium polyphosphate with the degree of polymerization ranging from 100 to 120. The ammonium polyphosphate obtained by adopting the method provided by the invention has a high degree of polymerization and high purity, and can be used as a flame-resistant material.

Description

technical field [0001] The invention relates to the production field of ammonium polyphosphate, in particular to a method for producing ammonium polyphosphate by using phosphoric acid and urea. Background technique [0002] Ammonium polyphosphate (APP) is not a single compound, but a class of substances with similar chemical composition and some differences in structure and properties, such as H (n-m)+2 (NH 4 ) m P n o 3n+1 , H (n-m) (NH 4 ) m P n o 3n+1 , (NH 4 ) n +2P n o 3n+1 , (NH 4 PO 3 ) n . According to its degree of polymerization, ammonium polyphosphate can be divided into three types: low polymerization, medium polymerization and high polymerization, but no exact division is made. Generally, those with a degree of polymerization less than 20 are called oligopolyammonium phosphate, those with a degree of polymerization of 20-100 are medium ammonium polyphosphate, and those with a degree of polymerization greater than 100 are called high ammonium pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/40C09K21/04B01J19/18
CPCC01B25/405C09K21/04B01J19/18Y02P20/10
Inventor 兰洲李兵江涛张治平梅胜明
Owner 中化重庆涪陵化工有限公司
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