US 2026/0108825 A1Published application

Water removal and recovery system and method for lithium bis(fluorosulfonyl)imide

AssigneesMorimatsu (Jiangsu) Heavy Industry Co., Ltd., Shanghai Morimatsu Engineering Technology Co., LTD

InventorsYanbing HOU, Koei NISHIMATSU, Zhenxing LI, Hongwei CHEN, Sheng XU, Lurong MAO

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Abstract

The present disclosure is provided with water removal and recovery system and method for lithium bis(fluorosulfonyl)imide. Specifically, the purification of lithium bis(fluorosulfonyl)imide crude products is achieved by two-stage thin film evaporators in series, thereby acquiring lithium bis(fluorosulfonyl)imide with sufficiently high purity with a relatively simple structure. The thin film evaporators themselves integrate the evaporation system and the condensation system, which not only simplifies the system configuration of connecting pipelines or tubs, 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, such that the content of organic phase solvents in the separated water is very low, and the content of water in the organic phase solvents is also very low. This allows for the maximum recovery of high-purity solvent for reuse, thereby facilitating the reduction of wastewater treatment costs.

Claims9

Dependent claims

A water removal and recovery system for lithium bis(fluorosulfonyl)imide, comprising:

a water separator configured to separate water and organic phase solvents for recovery respectively, the water separator comprising a first chamber and a second chamber, with a partition plate provided between the first chamber and the second chamber, and a liquid in the first chamber being able to overflow over the partition plate into the second chamber;
a first thin film evaporator, which is a short-range thin film evaporator and which comprises a first feed port, a first light component discharge port, and a first heavy component discharge port, the first feed port being configured to receive a product liquid which contains lithium bis(fluorosulfonyl)imide, water, and other solvents, and the first light component discharge port being in direct communication with the first chamber of the water separator;
a second thin film evaporator, which is a short-range thin film evaporator and which comprises a second feed port, a second light component discharge port, and a second heavy component discharge port, the second feed port being in communication with the first heavy component discharge port, and the second light component discharge port being in direct communication with the first chamber of the water separator;
and
a drying device, which is in communication with the second heavy component discharge port and configured to dry and crystallize a heavy component substance from the second thin film evaporator to acquire lithium bis(fluorosulfonyl)imide.

2 more elements

A water removal and recovery method for lithium bis(fluorosulfonyl)imide, wherein the water removal and recovery method for lithium bis(fluorosulfonyl)imide is used in a water removal and recovery system for lithium bis(fluorosulfonyl)imide compromising:

a water separator configured to separate water and organic phase solvents for recovery respectively, the water separator comprising a first chamber and a second chamber, with a partition plate provided between the first chamber and the second chamber, and a liquid in the first chamber being able to overflow over the partition plate into the second chamber;
a first thin film evaporator, which is a short-range thin film evaporator and which comprises a first feed port, a first light component discharge port, and a first heavy component discharge port, the first feed port being configured to receive a product liquid which contains lithium bis(fluorosulfonyl)imide, water, and other solvents, and the first light component discharge port being in direct communication with the first chamber of the water separator;
a second thin film evaporator, which is a short-range thin film evaporator and which comprises a second feed port, a second light component discharge port, and a second heavy component discharge port, the second feed port being in communication with the first heavy component discharge port, and the second light component discharge port being in direct communication with the first chamber of the water separator;
and
a drying device, which is in communication with the second heavy component discharge port and configured to dry and crystallize a heavy component substance from the second thin film evaporator to acquire lithium bis(fluorosulfonyl)imide,
the method comprising:
a feeding step, in which the product liquid containing lithium bis(fluorosulfonyl)imide, water, and other solvents is conveyed into the first thin film evaporator via the first feed port;
a first evaporation separation step, in which a light component substance separated by the first thin film evaporator enters the water separator via the first light component discharge port for separation and recovery in the water separator, and a heavy component substance separated by the first thin film evaporator enters the second thin film evaporator via the first heavy component discharge port and the second feed port;
a second evaporation separation step, in which a light component substance separated by the second thin film evaporator enters the water separator via the second light component discharge port for separation and recovery in the water separator, and a heavy component substance separated by the second thin film evaporator is conveyed out via the second heavy component discharge port;
and
a drying step, in which the heavy component substance from the second thin film evaporator is dried and crystallized in the drying device to acquire lithium bis(fluorosulfonyl)imide,
the water removal and recovery method further comprising a light component separation step, in which the light component substance entering the first chamber of the water separator contains immiscible water and organic phase solvents, and the organic phase solvents in the first chamber being able to overflow over the partition plate into the second chamber of the water separator.

9 more elements

Dependencies are inferred from the claim text.