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Continuous synthesis method and continuous synthesis device of lithium hexafluorophosphate

A technology of lithium hexafluorophosphate and its synthesis method, which is applied in the direction of lithium hexafluorophosphate, phosphorus compounds, chemical instruments and methods, etc., can solve problems such as high risk, and achieve the effects of reducing production costs, reducing three wastes, and improving reaction efficiency

Pending Publication Date: 2020-02-21
湖北迈可凯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the synthesis of lithium hexafluorophosphate mainly adopts the hydrogen fluoride solvent method, that is, in the hydrogen fluoride solvent, phosphorus pentafluoride and lithium fluoride are used to react to generate lithium hexafluorophosphate; there are also methods of using chlorine gas, phosphorus trichloride, lithium chloride, hydrogen fluoride, etc. as raw materials for lithium hexafluorophosphate Synthesis, as disclosed in the prior art (CN103069638A), but the chlorination reaction of chlorine and phosphorus trichloride, and the reaction of hydrogen fluoride and phosphorus pentachloride are very violent, and strong exothermic in the reaction process, therefore, the above synthesis The process is more dangerous

Method used

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  • Continuous synthesis method and continuous synthesis device of lithium hexafluorophosphate
  • Continuous synthesis method and continuous synthesis device of lithium hexafluorophosphate
  • Continuous synthesis method and continuous synthesis device of lithium hexafluorophosphate

Examples

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Embodiment 1

[0029] Provide a kind of lithium hexafluorophosphate continuous synthesis device in the present embodiment, such as figure 1 Shown, comprise: the first microreactor 1, the second microreactor 2 and the 3rd microreactor 3, the first microreactor 1 is communicated with flow meter 101 and first metering pump 102, and flow meter 101 is used for Import the amount of chlorine in the first microreactor 1 to measure, the first metering pump 102 is used to continuously import the phosphorus trichloride liquid in the first microreactor 1, and it is metered, the first microreactor 1 uses Phosphorus pentachloride is synthesized by reacting chlorine gas with phosphorus trichloride. The first microreactor 1 communicates with the second microreactor 2 to introduce the synthesized phosphorus pentachloride into the second microreactor 2 .

[0030] The second microreactor 2 is communicated with a second metering pump 201, and the second metering pump 201 is used for introducing anhydrous hydro...

Embodiment 2

[0038] Provide a kind of lithium hexafluorophosphate continuous synthesis device in the present embodiment, such as figure 2 As shown, it includes: a first microreactor 1 and a second microreactor 2, the first microreactor 1 is communicated with a flowmeter 101 and a first metering pump 102, and the flowmeter 101 is used to import the first microreactor 1 The amount of chlorine in the middle is metered, and the first metering pump 102 is used for continuously introducing phosphorus trichloride liquid in the first microreactor 1, and it is metered, and the first microreactor 1 is used for supplying chlorine and trichloride Phosphorus reacts to synthesize phosphorus pentachloride. The first microreactor 1 communicates with the second microreactor 2 to introduce the synthesized phosphorus pentachloride into the second microreactor 2 .

[0039] The second microreactor 2 is communicated with a second metering pump 201, and the second metering pump 201 is used to import lithium fl...

Embodiment 3

[0043] This embodiment provides a continuous synthesis method of lithium hexafluorophosphate. The synthesis device in Example 1 is used to measure chlorine gas through a flow meter 101, and the introduction rate of chlorine gas is controlled to be 70 g / min; the first metering pump 102 is turned on, and the first In the microreactor 1, continuously import phosphorus trichloride and chlorine reaction to generate phosphorus pentachloride, control the import speed of phosphorus trichloride to be 130g / min, in the present embodiment, the mol ratio of chlorine and phosphorus trichloride is 1: 1.01, control the reaction temperature of chlorine gas and phosphorus trichloride to be 150°C, and the reaction pressure to be 0.3MPa.

[0044] The phosphorus pentachloride synthesized in the first microreactor 1 is introduced in the second microreactor 2, and starts the second metering pump 201, and anhydrous hydrogen fluoride is continuously introduced into the second microreactor 2 and pentach...

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Abstract

The invention provides a continuous synthesis method and a continuous synthesis device of lithium hexafluorophosphate, and belongs to the technical field of lithium hexafluorophosphate synthesis. According to the invention, the synthesis method comprises: introducing chlorine, phosphorus trichloride, hydrogen fluoride and lithium fluoride into a microreactor to achieve an instantaneous uniform mixing and rapid reaction of the materials, and exporting reaction heat; the synthesis device comprises a first micro-reactor for synthesizing phosphorus pentachloride through a reaction of chlorine andphosphorus trichloride, and a second micro-reactor for a reaction of the phosphorus pentachloride; and the chlorination reaction and the fluorination reaction are carried out by adopting the microreactor, so the intermolecular heat transfer and mass transfer efficiency of the reaction materials is high, the reaction efficiency is improved, and the reaction heat can be exported so as to ensure thesafety.

Description

technical field [0001] The invention belongs to the technical field of lithium hexafluorophosphate preparation, and specifically relates to a continuous synthesis method of lithium hexafluorophosphate. In addition, the invention also relates to a device for implementing the above-mentioned continuous synthesis method of lithium hexafluorophosphate. Background technique [0002] Lithium hexafluorophosphate (LiPF 6 ) as a lithium-ion battery electrolyte, mainly used in lithium-ion power batteries, lithium-ion energy storage batteries and other daily-use batteries, has become an irreplaceable lithium-ion battery electrolyte. [0003] At present, the synthesis of lithium hexafluorophosphate mainly adopts the hydrogen fluoride solvent method, that is, in the hydrogen fluoride solvent, phosphorus pentafluoride and lithium fluoride are used to react to generate lithium hexafluorophosphate; there are also methods of using chlorine gas, phosphorus trichloride, lithium chloride, hydro...

Claims

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Application Information

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IPC IPC(8): C01B25/455
CPCC01D15/005
Inventor 陈建生
Owner 湖北迈可凯科技有限公司
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