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Continuous preparation method of phosphorus pentafluoride

A technology of phosphorus pentafluoride and fluorine gas, applied in the field of continuous preparation of phosphorus pentafluoride, can solve the problems of unfavorable reaction rate, uncontrolled reaction, high safety risk, etc., to reduce safety risks, avoid explosion accidents, and easily react control effect

Inactive Publication Date: 2018-12-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this method uses solid phosphorus as a raw material, and solid yellow phosphorus is particles with different surface areas, the contact area between yellow phosphorus and fluorine gas fed into the reactor at different times cannot be kept consistent, resulting in large fluctuations in the reaction rate, which is not conducive to Stable and accurate control of the reaction rate. Since the reaction between yellow phosphorus and fluorine gas will release a large amount of heat, when the reaction rate fluctuates greatly, it is easy to cause an explosion accident due to a reaction out of control, and the safety risk is greater

Method used

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  • Continuous preparation method of phosphorus pentafluoride
  • Continuous preparation method of phosphorus pentafluoride

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Embodiment 1

[0030] Such as figure 1 and figure 2 Shown, adopt following equipment and process to prepare phosphorus pentafluoride. The production equipment that adopts comprises horizontal reaction vessel 1, has the liquid level keeping section 2 of certain height in the inner chamber of described horizontal reaction vessel 1, and the area of ​​the horizontal section of arbitrary height position of described liquid level keeping section 2 is equal, A liquid inlet channel 3 is provided below the liquid level maintaining section 2 , an inlet channel 4 is provided at one end of the upper horizontal reaction vessel 1 , and an exhaust channel 5 is provided at the other end. The horizontal reaction vessel 1 adopts a high-temperature and high-pressure resistant reactor, the liquid inlet channel 3 is used to continuously pass liquid yellow phosphorus into the horizontal reaction vessel 1, and the gas inlet channel 4 is used to continuously pass fluorine gas into the horizontal reaction vessel 1...

Embodiment 2

[0033] Adopt the equipment described in embodiment 1 to carry out the production of phosphorus pentafluoride, only change the parameter of part, wherein, control yellow phosphorus liquid level constant to be 0.1m 2 , the feed rate of fluorine gas is 0.5m / s, and the reaction temperature is controlled to be 100°C. The distance between the inlet of fluorine gas and the liquid surface of yellow phosphorus is kept at 50-80mm. The temperature detector 10 detects the reaction temperature in the horizontal reaction vessel 1, and the pressure detector 11 detects the reaction pressure in the horizontal reaction vessel 1. Through monitoring, it can be seen that the reaction temperature fluctuates within 80-120°C using this process, and the reaction The pressure fluctuates within 0.1-0.2 MPa, the fluctuation of reaction temperature and reaction pressure is small, and the reaction proceeds smoothly.

Embodiment 3

[0035] Adopt the equipment described in embodiment 1 to carry out the production of phosphorus pentafluoride, only change the parameter of part, wherein, control yellow phosphorus liquid surface area constant to be 2m 2 , the feed rate of fluorine gas is 2m / s, and the reaction temperature is controlled at 200°C. The distance between the inlet of fluorine gas and the liquid surface of yellow phosphorus is kept at 80-120mm. The temperature detector 10 detects the reaction temperature in the horizontal reaction vessel 1, and the pressure detector 11 detects the reaction pressure in the horizontal reaction vessel 1. Through monitoring, it can be known that the reaction temperature fluctuates within 180-220°C with this process, and the reaction The pressure fluctuates within 0.1-0.2 MPa, the fluctuation of reaction temperature and reaction pressure is small, and the reaction proceeds smoothly.

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Abstract

The invention relates to a continuous preparation method of phosphorus pentafluoride, and belongs to the technical field of preparation of the phosphorus pentafluoride. The invention aims to provide the continuous preparation method of the phosphorus pentafluoride. According to the continuous preparation method, under the protection of an inert gas, the liquid level of liquid yellow phosphorus isinflated with fluorine gas and a reaction is performed to obtain the phosphorus pentafluoride, wherein during a liquid reaction, the liquid level area of the yellow phosphorus is kept constant. According to the continuous preparation method, through continuous inflation of the fluorine gas and reaction of the fluorine gas and the liquid phosphorus, the phosphorus pentafluoride can be continuouslyprepared; the conventional gas-solid reaction of the fluorine gas and the phosphorus is changed into an gas-liquid reaction, and the reaction thereof is easy to control; through control of the gas flow and the liquid level area, the speed rate can be controlled to achieve the purpose of controlling reaction heat, so that the whole reaction process is stable, an explosion accident caused by violentreaction is avoided and safety risks are reduced.

Description

technical field [0001] The invention relates to a continuous preparation method of phosphorus pentafluoride, belonging to the technical field of phosphorus pentafluoride preparation. Background technique [0002] Phosphorus pentafluoride is an important inorganic fluoride, which can be used in the electronics industry, polymer materials and organic synthesis catalysts. In recent years, with the development of lithium batteries, phosphorus pentafluoride is an important raw material for the production of lithium hexafluorophosphate electrolyte materials for lithium batteries, and its demand and quality requirements are also increasing. Therefore, large-scale continuous production of phosphorus pentafluoride is of great significance . [0003] At present, there are two main processes for industrialized production of high-purity phosphorus pentafluoride, one is to use phosphorus pentachloride to react with hydrogen fluoride to generate phosphorus pentafluoride and hydrogen chlo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/10
CPCC01B25/10
Inventor 杨林张攀张志业王辛龙孔行健
Owner SICHUAN UNIV
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