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Treatment method and device for lithium hexafluorophosphate synthesis tail gas

A technology of lithium hexafluorophosphate and synthetic tail gas, which is applied in the direction of lithium hexafluorophosphate, fluorosulfonic acid, lithium compounds, etc., can solve the problems of high pressure on environmental protection, and achieve the effects of low cost, reduced emissions, and reduced consumption

Pending Publication Date: 2020-01-14
湖北迈可凯科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on the above-mentioned background problem, the present invention aims to provide a method for treating tail gas from lithium hexafluorophosphate synthesis, using chlorosulfonic acid reaction to absorb hydrogen fluoride in the tail gas, hydrogen chloride in the tail gas is reacted and absorbed with sulfur trioxide to generate chlorosulfonic acid, the whole process does not produce hydrochloric acid, It solves the defect of high environmental protection pressure caused by a large amount of hydrochloric acid output in the prior art, and the output of chlorosulfonic acid and fluorosulfonic acid are important chemical raw materials, realizing the resource utilization of mixed acid

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  • Treatment method and device for lithium hexafluorophosphate synthesis tail gas

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Embodiment 1

[0026] In this embodiment, an exhaust gas treatment device for synthesis of lithium hexafluorophosphate is provided, such as figure 1 As shown, it includes: a primary absorption tower 1, a liquid sulfur trioxide generating assembly, and a secondary absorption tower 2. The inside of the primary absorption tower 1 uses circulating liquid chlorosulfonic acid as the reaction medium for absorbing hydrogen fluoride in the tail gas; the liquid sulfur trioxide generating assembly is used to heat and condense fuming sulfuric acid to form liquid sulfur trioxide; secondary absorption Tower 2 is connected with the output end of the liquid sulfur trioxide generating assembly, and is used for reacting the liquid sulfur trioxide with the hydrogen chloride in the tail gas.

[0027] Specifically, the first-stage absorption tower 1 is connected with a circulation component to circulate the liquid chlorosulfonic acid, thereby promoting reaction absorption. The circulation assembly of this embodime...

Embodiment 2

[0033] This embodiment provides a method for processing tail gas from the synthesis of lithium hexafluorophosphate. The processing device in Example 1 is used to contain 20% HF, 75% HCl and 5% PF. 5 The tail gas is passed into the first-stage absorption tower 1, and the circulating liquid chlorosulfonic acid is used as the reaction medium in the tower. Hydrogen fluoride reacts with chlorosulfonic acid to generate fluorosulfonic acid. The pressure in the first-stage absorption tower 1 is controlled to be 0.01MPa and the reaction temperature is 10 ℃. The reaction medium is circulated in the first-stage absorption tower 1 through the first circulation pump 101 to promote reaction absorption, and the reaction medium passes through the first heat exchanger 102 to remove the reaction heat. When the content of the fluorosulfonic acid product produced by the reaction reaches more than 98%, it is put into the fluorosulfonic acid tank 103 from the outlet of the primary absorption tower 1....

Embodiment 3

[0039] The difference between Example 3 and Example 2 is that the reaction pressure in the first-stage absorption tower 1 is controlled to be 0.1MPa and the reaction temperature is 40°C, and the reaction pressure in the second-stage absorption tower 2 is controlled to be 0.3MPa and the reaction temperature is 40°C. .

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Abstract

The invention provides a treatment method and device for lithium hexafluorophosphate synthesis tail gas, belonging to the technical field of tail gas treatment. The treatment method comprises the following steps: absorbing hydrogen fluoride in tail gas by using chlorosulfonic acid, absorbing hydrogen chloride in the tail gas by using sulfur trioxide, and returning phosphorus pentafluoride in the tail gas to a lithium hexafluorophosphate synthesis process for reuse. The treatment device comprises a first-stage absorption tower which internally adopts circulating liquid chlorosulfonic acid as areaction medium and is used for absorbing hydrogen fluoride in the tail gas, and a secondary absorption tower which is used for supplying the liquid sulfur trioxide for a reaction with hydrogen chloride in the tail gas. According to the invention, hydrogen fluoride in the tail gas is absorbed by a reaction with chlorosulfonic acid; a reaction with sulfur trioxide is performed to adsorb hydrogen chloride in the tail gas and to generate chlorosulfonic acid; and hydrochloric acid is not generated in the whole process, the defect of high environmental protection pressure caused by production of alarge amount of hydrochloric acid in the prior art is overcome, the produced chlorosulfonic acid and fluorosulfonic acid are important chemical raw materials, and resource utilization of mixed acid isrealized.

Description

Technical field [0001] The present invention belongs to the technical field of exhaust gas treatment, and specifically relates to a method for processing lithium hexafluorophosphate synthesis tail gas. In addition, the invention also relates to a processing device for implementing the above-mentioned method for processing lithium hexafluorophosphate synthesis tail gas. Background technique [0002] As lithium ion battery electrolyte, lithium hexafluorophosphate is mainly used in lithium ion power batteries, lithium ion energy storage batteries and other daily battery fields, and has become an irreplaceable lithium ion battery electrolyte. At present, the synthesis of lithium hexafluorophosphate mainly adopts the hydrogen fluoride solvent method. The tail gas produced by the synthesis process contains hydrogen fluoride, hydrogen chloride and phosphorus pentafluoride. After absorption with water, a large amount of mixed acid of hydrofluoric acid, hydrochloric acid and phosphoric aci...

Claims

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Application Information

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IPC IPC(8): C01B17/46C01B25/10C01D15/00
CPCC01B17/463C01B17/466C01B25/10C01D15/005
Inventor 陈建生
Owner 湖北迈可凯科技有限公司
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