Purification device and method for organic solvent

Abstract

The invention belongs to the technical field of solvent purification, and particularly relates to a purification device and method for an organic solvent. The purification device comprises a raw material storage tank, an atomizing dryer, a gas-liquid separator, a molecular sieve absorber, a filter, a gas circulation pump, a first collection tank and a second collection tank, wherein the atomizingdryer is connected with the raw material storage tank; the atomizing dryer, the gas-liquid separator, the molecular sieve absorber, the filter and the gas circulation pump are connected sequentially to form a circulation loop, the first collection tank is connected with the gas-liquid separator, the second collection tank is connected with the bottom of the atomizing dryer, and the second collection tank is also connected with the raw material storage tank. Compared with the prior art, the purification device and method have the advantages that the structure is simple, energy consumption during purification is low, reaction with other components in an electrolyte due to molecular sieve debris brought into the solvent can be avoided, and the probability of excess impurities is reduced.

Description

technical field [0001] The invention belongs to the technical field of solvent purification, and in particular relates to an organic solvent purification device and a purification method. Background technique [0002] Lithium-ion batteries are green, high-energy, and environmentally friendly batteries that have attracted much attention in recent years. They are used in everything from mobile phone batteries to new energy vehicles. Electrolyte is an important part of lithium battery, its quality directly affects the optimization and improvement of battery performance. As the key core component of the electrolyte, a single organic solvent must have a purity of not less than 99.95%, moisture not higher than 20ppm, and impurities not higher than 1ppm, and then several solvents, high-purity lithium salts and additives, control the production conditions to obtain the mixed Get the required electrolyte. [0003] As market competition intensifies, profits decrease, and industriali...

AI Technical Summary

Problems solved by technology

However, the distillation method can only achieve the purification of a single special solvent, the equipment is complicated, the demand for personnel is large, the energy consumption is low, and the yield is not high. It is not easy to achieve a yield of 90%.

The existing molecular sieve dehydration process has become the most common production method for most manufacturers at home and abroad. Although its production cost is low, its shortcomings are also obvious

Molecular sieves are compounds containing sodium, potassium, calcium, aluminum, silicon and oxygen, as well as a certain amount of bound water, and even some special additives. These substances do not enter the electrolyte and do not affect the quality of the electrolyte, but in the dehydration purification process The fine powder on the surface of the molecular sieve is constantly rubbed, and the fine dust with a particle size of less than 0.2um is difficult to be filtered out by the filter, and it directly enters the electrolyte of the lithium-ion battery. The electrolyte is a mixture containing a small amount of hydrofluoric acid. React with hydrofluoric acid to form metal ions, causing the content of impurity ions to exceed the standard, which ultimately affects battery performance

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