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Method of two-step production of II type ammonium polyphosphate

A technology of ammonium polyphosphate and yellow phosphorus, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low polymerization degree of APP and human hazards, and achieve high safety, low hygroscopicity, and heat resistance Good results

Active Publication Date: 2016-06-15
YUNNAN TIANYAO CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] According to scientific research reports on polyphosphoric acid press, the polymerization degree of APP currently produced is low
The industrial production of APP with a high degree of polymerization is produced by the system of phosphorus pentoxide, which is a high-risk chemical product that is seriously harmful to the human body.

Method used

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  • Method of two-step production of II type ammonium polyphosphate
  • Method of two-step production of II type ammonium polyphosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0032] After liquefied, 3kg of yellow phosphorus is sprayed into the combustion furnace through a phosphorus spray gun, and the air enters the phosphorus spray gun at the same time from the air compressor through the gas-water separator and the metering instrument. gaseous P 2 o 5 . Gaseous P 2 o 5 After cooling to 525°C with cooling water, it enters the reactor to react with ammonia gas and water vapor. The amount of ammonia gas and water vapor is 1.6kg and 0.8kg respectively, and the reaction temperature is 400°C. After 30 minutes of reaction, the white intermediate ammonium metaphosphate is obtained. Collect it after cooling, put it into the polymerization equipment, pass through ammonia to heat and polymerize. The polymerization temperature is 220°C, the gauge pressure is 0.7MPa, the rotation speed is 30r / min, and the reaction is for 2 hours. After cooling down the reaction product to 100°C, the ammonia flow is stopped, and the type II ammonium polyphosphate product is...

Embodiment 2

[0037] After liquefied, 0.08kg of yellow phosphorus is sprayed into the combustion furnace through the phosphorus spray gun, and the air enters the phosphorus spray gun through the air compressor through the gas-water separator and the meter at the same time. Combustion at ℃ to form gaseous P 2 o 5 . After cooling to 500°C with cooling water, it enters the reactor to react with ammonia gas and water vapor. The amount of ammonia gas and water vapor is 0.8kg and 0.8kg respectively, and the reaction temperature is 100°C. After 20 minutes of reaction, the white intermediate ammonium metaphosphate is obtained. Collect it after cooling, put it into the polymerization equipment, pass through ammonia to heat and polymerize. The polymerization temperature is 100°C, the gauge pressure is 0.05MPa, the rotation speed is 30r / min, and the reaction is 30min. After cooling down the reaction product to 100°C, the ammonia flow is stopped, and the type II ammonium polyphosphate product is obta...

Embodiment 3

[0041] After liquefied, 30kg of yellow phosphorus is sprayed into the combustion furnace through a phosphorus spray gun, and the air enters the phosphorus spray gun at the same time from the air compressor through the gas-water separator and metering instruments. gaseous P 2 o 5 . After cooling to 550°C with cooling water, it enters the Venturi reactor for reaction with ammonia gas and water vapor. The amount of ammonia gas and water vapor is 15kg and 3kg respectively, and the reaction temperature is 600°C. After 20 minutes of reaction, the white intermediate ammonium metaphosphate is obtained. Collect it after cooling, put it into a special polymerization equipment, and heat it with ammonia to polymerize. The polymerization temperature is 350°C, the gauge pressure is 1.5MPa, the rotation speed is 30r / min, and the reaction is carried out for 20 hours. After cooling the reaction product to 100°C, the ammonia flow is stopped, and the type II ammonium polyphosphate product is o...

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Abstract

The invention belongs to the field of inorganic chemical industry technology, and more specifically relates to a method of two-step production of II type ammonium polyphosphate. The method comprises the following steps: (1) liquefaction of a raw material yellow phosphorus; (2) the liquid yellow phosphorus is atomized in a spray gun by compressed air and is injected into a combustion furnace; (3) atomized yellow phosphorus combusts in the combustion furnace for generating phosphorus pentoxide gas; (4) the generated phosphorus pentoxide gas is cooled and enters a reactor; (4) a reaction is carried out between phosphorus pentoxide gas, ammonia gas and water in the reactor at a normal pressure, a white intermediate product is obtained, and the obtained white intermediate product is cooled and collected; (6) the collected white intermediate product is placed in polymerization equipment with ammonia gas added for heating polymerization; (7) a product after polymerization is grinded, and II type ammonium polyphosphate is obtained. The ammonium polyphosphate has the advantages of fine particles, white color, good dispersibility, good heat resistance, high crystallization II type purity, high polymerization degree, good quality, high safety in the whole production process, and large output.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, in particular to a two-step method for producing type II ammonium polyphosphate. Background technique [0002] Ammonium polyphosphate (APP) is an inorganic flame retardant with high efficiency, low toxicity and low price. Due to its high phosphorus and nitrogen content, strong moisture absorption resistance, good thermal stability, small specific gravity, excellent dispersion performance, the product is close to medium It can be used alone or in combination with other flame retardants. It is widely used in fire retardant of coatings, plastics, paper, wood, etc., and can also be used as a dry powder fire extinguisher for large-scale fire extinguishing in forests and coal fields. Used as an acid source in intumescent fire retardant coatings, the flame retardant effect is remarkable. [0003] Ammonium polyphosphate is an important high-efficiency inorganic flame retardant. It i...

Claims

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Application Information

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IPC IPC(8): C01B25/40
CPCC01B25/405C01P2002/72
Inventor 杨晓龙黄跃川吴志峰晏世涛张万平
Owner YUNNAN TIANYAO CHEM
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