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Method for recycling phosphorus pentafluoride in lithium hexafluorophosphate synthesis tail gas by using diethyl carbonate

A technology of diethyl carbonate and lithium hexafluorophosphate, which is applied in the field of lithium hexafluorophosphate synthesis, can solve the problems of restricting industrial reuse and difficulty in separation, and achieve the effects of improving raw material utilization, reducing loss, and reducing pollution

Inactive Publication Date: 2020-06-16
福建省龙德新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the mixed acid generated from the recovery of lithium hexafluorophosphate tail gas, the subsequent industrial reuse is greatly limited due to the phosphorus content
Phosphorus pentafluoride enters the exhaust system and reacts with water to produce phosphoric acid, fluorophosphoric acid, etc., which belong to protonic acids like hydrogen chloride and hydrogen fluoride, have similar properties, and are difficult to separate, which has become a difficult problem restricting subsequent development and utilization
However, there is no effective method for the separation and recycling of phosphorus pentafluoride in the tail gas of lithium hexafluorophosphate synthesis in the prior art

Method used

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  • Method for recycling phosphorus pentafluoride in lithium hexafluorophosphate synthesis tail gas by using diethyl carbonate

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Effect test

Embodiment 1

[0026] The tail gas of lithium hexafluorophosphate synthesis is a mixed gas of hydrogen fluoride, hydrogen chloride and phosphorus pentafluoride. Take a certain volume of mixed gas to measure the content of hydrogen fluoride, hydrogen chloride and phosphorus pentafluoride. The test method is as follows: absorb with three-stage sodium hydroxide lye, the size of the absorption tower is 40mm*300mm (inner diameter*height), and the packing of the absorption tower is uniform It is made of PTFE, Pall ring packing 5mm*φ5mm, the concentration of sodium hydroxide is 2% (w / w), and the alkali absorption solution is combined to determine F by ion chromatography - , Cl - and PO 4 3- The contents were 8.664μg / ml, 11.465μg / ml, 0.931μg / ml ( figure 1 ), according to a molecule of PF 5 After the lye is absorbed, a molecule of PO is produced 4 3- And the quantitative relationship of 5 molecules HF is converted into mass ratio, HF, HCl and PF 5 The mass ratio is 0.552 / 0.384 / 0.064 (w / w).

...

Embodiment 2

[0029] The flow velocity of mixed gas is 20L / min, and other operation is the same as embodiment 1, records PF 5 The absorption efficiency is 74.8%. When the temperature rises to 90°C, PF 5 Gas is released.

Embodiment 3

[0031] The flow velocity of mixed gas is 30L / min, and other operation is the same as embodiment 1, records PF 5 The absorption efficiency is 45.2%. When the temperature rises to 75°C, PF 5 Gas is released.

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Abstract

The invention provides a method for recycling phosphorus pentafluoride in lithium hexafluorophosphate synthesis tail gas by using diethyl carbonate. The method comprises the following steps: reactingdiethyl carbonate with phosphorus pentafluoride in the lithium hexafluorophosphate synthesis tail gas to form a solid or liquid complex, separating the solid or liquid complex, heating the solid or liquid complex to release phosphorus pentafluoride, purifying the released phosphorus pentafluoride, and introducing the purified phosphorus pentafluoride into a lithium hexafluorophosphate synthesis system for the second time. The method is high in raw material utilization rate and reduces pollution.

Description

technical field [0001] The invention relates to a method for using diethyl carbonate to reuse lithium hexafluorophosphate to synthesize phosphorus pentafluoride in tail gas, and belongs to the technical field of lithium hexafluorophosphate synthesis. Background technique [0002] Since the second half of the 20th century, with the advancement of science and technology, human society has entered a stage of rapid development, and the demand for energy is also increasing. As a primary energy source, fossil fuels have played an infinite role in human development so far. However, human beings are also facing the problems of energy depletion and environmental pollution. Finding alternative new clean energy has become a common challenge for human beings. In the 21st century, the development and utilization of new energy sources have made remarkable progress, especially lithium-ion batteries have been successfully used in traditional 3C (computers, cameras, mobile phones, etc.), ele...

Claims

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Application Information

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IPC IPC(8): C01B25/10C01B25/455
CPCC01B25/10C01D15/005
Inventor 杨瑞甫赖育河肖文绪肖丰贤杨岳迅
Owner 福建省龙德新能源有限公司
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