Device and method for continuously preparing lithium fluorosulfonate

Abstract

The invention discloses a method for continuously preparing lithium fluorosulfonate, which synthesizes the lithium fluorosulfonate in one step by using anhydrous hydrogen fluoride, lithium fluoride and sulfur trioxide or fuming sulphuric acid as raw materials. The invention further discloses a device for continuously preparing the lithium fluorosulfonate, which comprises a anti-pressure dissolution tank, a filter, a first metering pump, a second metering pump, a micro-reactor, an evaporator, a compressor, a condenser, a recovery acid tank, a crystallizer, a recrystallization device and a solvent recovery tank. The anti-pressure dissolution tank is provided with two charging openings which are respectively used for charging the anhydrous hydrogen fluoride and the lithium fluoride; a feed inlet on the second metering pump is used for charging the sulfur trioxide; a stirring device is arranged on the anti-pressure dissolution tank; a discharge port at the bottom of the anti-pressure dissolution tank is connected to the inlet end of the filter by a pipeline; the outlet end of the filter is connected to the first metering pump by a pipeline; and discharge ports of both the first metering pump and the second metering pump are connected to the micro-reactor. According to the invention, in the machining process, the lithium fluorosulfonate is synthesized by adopting a one-step method;product quality is stable; and yield is high.

Description

technical field [0001] The invention belongs to the technical field of lithium fluorosulfonate preparation, and in particular relates to a device and method for continuously preparing lithium fluorosulfonate. Background technique [0002] Lithium fluorosulfonate is a new type of lithium salt that can be used as an electrolyte for lithium-ion batteries. When lithium fluorosulfonate is used as an electrolyte for lithium-ion batteries, it can greatly improve the cycle characteristics of high-temperature charging and discharging of lithium batteries and maintain a high battery capacity retention rate. [0003] Japanese Mitsubishi Corporation patent CN106882820.A discloses a kind of manufacture method of lithium fluorosulfonate, adopts in non-aqueous, aprotic solvent (recommended to use carbonate), lithium halide or lithium carboxylate reacts with fluorosulfonic acid, manufactures lithium fluorosulfonate method, the reaction conditions are mild, but there is a problem that the s...

AI Technical Summary

Problems solved by technology

Using aprotic solvents (carbonates), there is a problem that the separation of by-product hydrogen chloride gas and residual chlorosulfonic acid affects the yield

[0005] The synthesis process in the prior art has the following defects: 1. There is separation of by-products, which affects the yield; 2. The batch quality control is prone to deviation; Fluorosulfonic acid and chlorosulfonic acid are super-strong acids, and if they overflow, the risk is greater; 4. The liquid holding capacity in each reaction kettle is large, which is a dangerous process; 5. The consumption of raw materials is high, and there are more three wastes

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