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A method for continuous production of H-type phosphorus pentoxide

A technology of phosphorus pentoxide and yellow phosphorus, which is applied in the field of continuous production of h-type phosphorus pentoxide, can solve the problems of waste of heat energy, difficulty in crystal form control, low quality, etc., and improve the sedimentation velocity, fluidity and dispersion Good performance and high reactivity

Active Publication Date: 2017-04-12
ZHEJIANG KAIMINGKE ENG DEV CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of difficult control of the crystal form, low quality and waste of heat energy in the existing production of phosphorus pentoxide, the present invention provides a method for continuously producing h-type phosphorus pentoxide with yellow phosphorus as raw material, and the process is stable Good stability, controllable crystal form of phosphorus pentoxide, high purity, high efficiency of heat energy recovery and utilization, in line with high efficiency, energy saving, environmental protection, clean production process requirements

Method used

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  • A method for continuous production of H-type phosphorus pentoxide

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Embodiment 1

[0026] (1) Yellow phosphorus combustion: After heating and melting the yellow phosphorus at 60°C, it is transported to the combustion tower for combustion to generate high-temperature phosphorus pentoxide mixed gas. The combustion tower is provided with three layers of compressed air injection ports, which are upper, middle and lower layers. Among them, the lower injection port is equipped with one injection port, which simultaneously injects yellow phosphorus and dry compressed air, the injected air volume is 0.9 times the air volume required for the combustion of yellow phosphorus theoretically, and the middle injection port has two injection ports. The amount of injected air is 0.5 times the theoretical amount of air required for the combustion of yellow phosphorus. The upper injection port is equipped with 2 injection ports. The amount of injected air is 0.3 times the amount of air required for the theoretical yellow phosphorus combustion. The discharge temperature of the com...

Embodiment 2

[0033] (1) Yellow phosphorus combustion: After heating and melting the yellow phosphorus at 75°C, it is transported to the combustion tower for combustion to generate high-temperature phosphorus pentoxide mixed gas. The combustion tower is provided with three layers of compressed air injection ports, which are upper, middle and lower layers. Among them, the lower injection port is equipped with one injection port, which simultaneously injects yellow phosphorus and dry compressed air, the injected air volume is 0.5 times the amount of air required for the combustion of yellow phosphorus theoretically, and the middle injection port has 4 injection ports. The amount of injected air is 0.8 times of the theoretical amount of air required for the combustion of yellow phosphorus. The upper injection port is equipped with 4 injection ports. The amount of injected air is 0.5 times of the theoretical amount of air required for the combustion of yellow phosphorus. The discharge temperature ...

Embodiment 3

[0038] (1) Yellow phosphorus combustion: After heating and melting the yellow phosphorus at 60°C, it is transported to the combustion tower for combustion to generate high-temperature phosphorus pentoxide mixed gas. The combustion tower is provided with three layers of compressed air injection ports, which are upper, middle and lower layers. Among them, the lower injection port is equipped with 2 injection ports, and the yellow phosphorus and dry compressed air are injected at the same time. The injected air volume is 0.75 times the air volume required for the combustion of yellow phosphorus theoretically. The middle injection port has 6 injection ports. The amount of injected air is 0.7 times of the theoretical amount of air required for the combustion of yellow phosphorus. The upper injection port is equipped with 6 injection ports. The amount of injected air is 0.4 times of the theoretical amount of air required for the combustion of yellow phosphorus. The discharge temperatur...

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Abstract

The invention provides a continuously-producing method of h-type P2O5, which includes the following steps: 1) heat-melting yellow phosphorus at 60-75 DEG C and feeding the yellow phosphorus to a combustion column to combust the yellow phosphorus to generate a high-temperature P2O5 mixed gas, wherein the combustion column is provided with a plurality of compressed air jet mouths and the gas temperature at the material outlet of the combustion column is 450-750 DEG C; and 2) cooling the P2O5 mixed gas in a cold-separation device, wherein P2O5 powder is cooled and separated out and then deposited on the bottom of the device, and then collecting the P2O5 powder, and finally feeding a tail gas being 150-200 DEG C into a tail gas treatment apparatus to treat the tail gas, and discharging the tail gas after the tail gas reaches a standard. The method solves the problems that combustion of yellow phosphorus and mixing with air are not complete, combustion temperature gradient is large and the crystal form of the P2O5 is difficult to control in a conventional P2O5 production process. The method can be used for preparing stable h-type P2O5, wherein the released heat from the P2O5 mixed gas in the cold separation can be recycled, thereby achieving both energy saving and economy.

Description

Technical field [0001] The invention belongs to the technical field of inorganic chemicals, and particularly relates to a method for continuously producing h-type phosphorus pentoxide by using yellow phosphorus as a raw material. Background technique [0002] Yellow phosphorus burns in air (oxygen) to produce phosphorus pentoxide, chemical formula P 2 O 5 , The formula weight is 141.94, the molecular formula can also be written as P 4 O 10 , White crystal powder. The real structure of phosphorus pentoxide is tetraphosphorus decoxide (P 4 O 10 ), its specific molecular structure is: insert an oxygen atom into each phosphorus bond of the phosphorus molecule, and the remaining four oxygen atoms are connected to the four phosphorus atoms through coordination bonds (the coordination bond formed by the phosphorus atom provides a pair of electrons) Position key). There are many crystal forms of phosphorus pentoxide. There are 3 types of crystal structure of phosphorus pentoxide under n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/12
Inventor 梅毅何锦林
Owner ZHEJIANG KAIMINGKE ENG DEV CO LTD
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