KR-102964392-B1 - Water removal and recovery system for lithium bis(fluorosulfonyl)imide, and water removal and recovery method

KR102964392B1KR 102964392 B1KR102964392 B1KR 102964392B1KR-102964392-B1

Abstract

The present disclosure provides a system and method for water removal and recovery for lithium bis(fluorosulfonyl)imide. Specifically, the purification of a lithium bis(fluorosulfonyl)imide product is achieved by a two-stage thin-film evaporator connected in series, thereby obtaining lithium bis(fluorosulfonyl)imide of sufficiently high purity with a relatively simple structure. The thin-film evaporator itself integrates an evaporation system and a condensation system, which not only simplifies the system configuration of connecting pipelines or tubes but also lowers resistance and reduces the risk of system leakage. Furthermore, the solvents and water after evaporation can be effectively separated by a water separator, so that the content of organic phase solvents in the separated water is very low and the water content in the organic phase solvents is also very low. This enables the maximum recovery of high-purity solvents for reuse, thereby facilitating a reduction in wastewater treatment costs.

Inventors

호우, 옌빙
니시마츠, 코에이
리, 전싱
첸, 홍웨이
쑤, 성
마오, 루롱

Assignees

모리마츠 (장쑤) 헤비 인더스트리 컴퍼니 리미티드
상하이 모리마츠 엔지니어링 테크놀로지 컴퍼니 리미티드

Dates

Publication Date: 20260512
Application Date: 20241025
Priority Date: 20240613

Claims (9)

As a water removal and recovery system for lithium bis(fluorosulfonyl)imide, A water separator configured to separate water and organic phase solvents and recover them separately — said water separator comprises a first chamber and a second chamber, wherein a partition is installed between the first chamber and the second chamber, and the liquid of the first chamber may overflow the partition and flow into the second chamber —; A first thin-film evaporator comprising a first supply port, a first light component discharge port, and a first heavy component discharge port, wherein the first supply port is configured to receive a product liquid comprising lithium bis(fluorosulfonyl)imide, water, and other solvents, and the first light component discharge port is in direct communication with the first chamber of the water separator. A second thin-film evaporator, which is a short-distance thin-film evaporator comprising a second supply port, a second light component discharge port, and a second heavy component discharge port — said second supply port is in communication with said first heavy component discharge port, and said second light component discharge port is in direct communication with said first chamber of said water separator —; and A drying device configured to communicate with the second heavy component discharge port and to dry and crystallize the heavy component material from the second thin film evaporator to obtain lithium bis(fluorosulfonyl)imide; comprising Characterized by having an integrated condenser installed in the first thin-film evaporator and the second thin-film evaporator. Water removal and recovery system for lithium bis(fluorosulfonyl)imide.
In paragraph 1, The above-mentioned water removal and recovery system for lithium bis(fluorosulfonyl)imide is, The apparatus further comprises a first liquid level sensor and a first water separation control valve, wherein the first water separation control valve is connected to the outlet of the first chamber and is opened or closed based on a parameter detected by the first liquid level sensor, and the first liquid level sensor is installed in the water separator to detect the liquid level of the liquid in the first chamber; and It further includes a second liquid level sensor and a second water separation control valve, wherein the second water separation control valve is connected to the outlet of the second chamber and is opened or closed based on a parameter detected by the second liquid level sensor, and the second liquid level sensor is installed in the water separator to detect the liquid level of the liquid in the second chamber; Characterized by satisfying at least one of the following: Water removal and recovery system for lithium bis(fluorosulfonyl)imide.
In paragraph 1, The above-mentioned water removal and recovery system for lithium bis(fluorosulfonyl)imide is, The wastewater treatment device and the mixed solvent storage device are further included, wherein the wastewater treatment device is connected to the outlet of the first chamber and the mixed solvent storage device is connected to the outlet of the second chamber; and The apparatus further comprises a first transfer pump and a second transfer pump, wherein the first transfer pump and the second transfer pump are each connected to the first chamber and the second chamber to transfer liquid from the first chamber and the second chamber to the first chamber and the second chamber. Characterized by satisfying at least one of the following: Water removal and recovery system for lithium bis(fluorosulfonyl)imide.
In paragraph 1, The solvent recovery device and the defective solvent storage device are further included, wherein the solvent recovery device is in communication with the drying device and the defective solvent storage device so that the defective solvent from the drying device can enter the solvent recovery device, be recovered, and then be stored in the defective solvent storage device. Water removal and recovery system for lithium bis(fluorosulfonyl)imide.
In paragraph 1, The above-mentioned water removal and recovery system for lithium bis(fluorosulfonyl)imide is, The apparatus further comprises a first temperature sensor and a first heat source control valve, wherein the first heat source control valve is opened or closed based on a parameter detected by the first temperature sensor, the first heat source control valve is installed in the first thin film evaporator, and the first temperature sensor is configured to detect the operating temperature of the first thin film evaporator; and It further includes a second temperature sensor and a second heat source control valve, wherein the second heat source control valve is opened or closed based on a parameter detected by the second temperature sensor, the second heat source control valve is installed in the second thin film evaporator, and the second temperature sensor is configured to detect the operating temperature of the second thin film evaporator; Characterized by satisfying at least one of the following: Water removal and recovery system for lithium bis(fluorosulfonyl)imide.
In paragraph 1, Characterized by further including a vacuum control device connected to the first thin film evaporator and the second thin film evaporator to control operating pressures. Water removal and recovery system for lithium bis(fluorosulfonyl)imide.
In paragraph 6, The above-mentioned water removal and recovery system for lithium bis(fluorosulfonyl)imide is, The first pressure sensor and the first pressure regulating valve are further included, wherein the first thin film evaporator is in a controlled communication state with the vacuum control device through the first pressure regulating valve, and the first pressure regulating valve is opened or closed based on a parameter detected by the first pressure sensor, and the first pressure sensor is disposed within the first thin film evaporator to detect the operating pressure of the first thin film evaporator; and It further includes a second pressure sensor and a second pressure regulating valve, wherein the second thin film evaporator is in a controlled communication state with the vacuum control device through the second pressure regulating valve, and the second pressure regulating valve is opened or closed based on a parameter detected by the second pressure sensor, and the second pressure sensor is installed in the second thin film evaporator to detect the operating pressure of the second thin film evaporator; Characterized by satisfying at least one of the following: Water removal and recovery system for lithium bis(fluorosulfonyl)imide.
In paragraph 6, It further includes an exhaust gas treatment device and a waste liquid treatment device, The exhaust gas treatment device and the waste liquid treatment device are characterized by being connected to the vacuum control device to treat exhaust gas and waste liquid from the vacuum control device. Water removal and recovery system for lithium bis(fluorosulfonyl)imide.
A water separator configured to separate water and organic phase solvents and recover them separately — said water separator comprises a first chamber and a second chamber, wherein a partition is installed between the first chamber and the second chamber, and the liquid of the first chamber may overflow the partition and flow into the second chamber —; A first thin-film evaporator comprising a first supply port, a first light component discharge port, and a first heavy component discharge port, wherein the first supply port is configured to receive a product liquid comprising lithium bis(fluorosulfonyl)imide, water, and other solvents, and the first light component discharge port is in direct communication with the first chamber of the water separator. A second thin-film evaporator, which is a short-distance thin-film evaporator comprising a second supply port, a second light component discharge port, and a second heavy component discharge port — said second supply port is in communication with said first heavy component discharge port, and said second light component discharge port is in direct communication with said first chamber of said water separator —; and A drying device configured to communicate with the second heavy component discharge port and to dry and crystallize the heavy component material from the second thin film evaporator to obtain lithium bis(fluorosulfonyl)imide; comprising A method for removing and recovering water for lithium bis(fluorosulfonyl)imide used in a water removal and recovery system for lithium bis(fluorosulfonyl)imide, characterized in that an integrated condenser is installed in the first thin-film evaporator and the second thin-film evaporator, wherein A supply step of transferring a product liquid comprising lithium bis(fluorosulfonyl)imide, water, and other solvents to the first thin film evaporator through the first supply port; A first evaporation separation step in which a light component material separated by the first thin film evaporator enters the water separator through the first light component discharge port and is separated and recovered in the water separator, and a heavy component material separated by the first thin film evaporator enters the second thin film evaporator through the first heavy component discharge port and the second supply port; A second evaporation separation step in which a light component material separated by the second thin film evaporator enters the water separator through the second light component discharge port and is separated and recovered in the water separator, and a heavy component material separated by the second thin film evaporator is discharged through the second heavy component discharge port; and The drying step comprises drying and crystallizing the heavy component material from the second thin-film evaporator in the drying device to obtain lithium bis(fluorosulfonylmide), and The method further comprises a hard component separation step comprising water and organic phase solvents that are not mixed with the hard component material entering the first chamber of the water separator, wherein the organic phase solvents of the first chamber can overflow the partition and flow into the second chamber of the water separator. Water removal and recovery method for lithium bis(fluorosulfonyl)imide.

Description

Water removal and recovery system for lithium bis(fluorosulfonyl)imide, and water removal and recovery method [1] The present disclosure relates to the field of manufacturing lithium bis(fluorosulfonyl)imide, and in particular to a system for removing and recovering water from lithium bis(fluorosulfonyl)imide and a method for removing and recovering water from lithium bis(fluorosulfonyl)imide. [2] In the field of lithium batteries, lithium salt electrolytes are an important component of lithium batteries. Lithium bis(fluorosulfonyl)imide has gained a wide range of application prospects in the field of lithium batteries due to its excellent performance in terms of thermal stability, resistance to decomposition, and electrical conductivity. However, lithium bis(fluorosulfonyl)imide is very sensitive to water and tends to decompose when in contact with water, which can degrade the performance and shorten the lifespan of lithium batteries. According to existing water removal methods for lithium bis(fluorosulfonyl)imide, dehydrating agents are sometimes added to remove moisture. However, this approach can result in impurity residues, making it impossible to obtain high-quality lithium bis(fluorosulfonyl)imide. [3] Although some solutions for purifying lithium bis(fluorosulfonyl)imide have been proposed by people in the art, the systems used to implement these solutions are generally complex in structure and lack effective means for separating and recovering water from other solvents. [4] The present disclosure is made in consideration of the latest prior art described above. One object of the present disclosure is to provide a water removal and recovery system for lithium bis(fluorosulfonyl)imide that can purify a lithium bis(fluorosulfonyl)imide product with a relatively simple structure and also efficiently recover and treat water and other solvents. Another object of the present disclosure is to provide a water removal and recovery method for lithium bis(fluorosulfonyl)imide used in the water removal and recovery system. [5] To achieve the above objectives, the present disclosure applies the following technical solutions. [6] The present disclosure provides a water removal and recovery system for lithium bis(fluorosulfonyl)imide, comprising: a water separator configured to separate water and organic phase solvents and recover each; a first thin film evaporator comprising a first supply port, a first light component discharge port and a first heavy component discharge port ― said first supply port is configured to receive a product liquid and said first light component discharge port is in communication with said water separator ―; and a second thin film evaporator comprising a second supply port, a second light component discharge port and a second heavy component discharge port ― said second supply port is in communication with said first heavy component discharge port and said second light component discharge port is in communication with said water separator ―. According to an optional solution, the water separator comprises a first chamber and a second chamber, wherein the first chamber is in communication with both the first hard component discharge port and the second hard component discharge port, and a partition is installed between the first chamber and the second chamber, and the liquid of the first chamber can flow over the partition into the second chamber. According to another optional solution, a first liquid level sensor and a first water separation control valve are further included, wherein the first water separation control valve is connected to the outlet of the first chamber and is opened or closed according to a parameter detected by the first liquid level sensor, and the first liquid level sensor is installed in the water separator to detect the liquid level of the liquid in the first chamber; and/or a second liquid level sensor and a second water separation control valve are further included, wherein the second water separation control valve is connected to the outlet of the second chamber and is opened or closed according to a parameter detected by the second liquid level sensor, and the second liquid level sensor is installed in the water separator to detect the liquid level of the liquid in the second chamber. According to another optional solution, a wastewater treatment device and a mixed solvent storage device are further included, said wastewater treatment device is connected to the outlet of the first chamber and said mixed solvent storage device is connected to the outlet of the second chamber; and/or a first transfer pump and a second transfer pump are further included, said first transfer pump and said second transfer pump are respectively connected to the first chamber and the second chamber to transfer liquids from the first chamber and the second chamber to the first chamber and the second chamber. According to another optional solution, at least one of the first thin film