Method for preparing ultrahigh-purity ethyl methyl carbonate through continuous rectification device

Abstract

The invention discloses a method for preparing ultrahigh-purity ethyl methyl carbonate through a continuous rectification device. The device comprises a rectifying tower I and a rectifying tower II, ethyl methyl carbonate is added into the rectifying tower I through a feeding hole I; a discharge hole I formed in the tower top of the rectifying tower I is used for removing gas-phase light components; tower kettle materials at the bottom in the rectifying tower I are conveyed to a feeding hole II through a conveying pump and enter the rectifying tower II; a discharging opening II formed in the tower top of the rectifying tower II is used for removing gas-phase light components, a discharging opening III formed in the rectifying tower II is used for extracting a high-purity ethyl methyl carbonate product, and tower kettle material heavy components at the bottom in the rectifying tower II are extracted through the conveying pump. By adopting the technical scheme, the defects of batch-typerectification are overcome, the production efficiency is high, and more than 99.99% of high-purity ethyl methyl carbonate product can be conveniently extracted from the tower of the rectifying tower II.

Description

technical field [0001] The invention relates to the technical field of ethyl methyl carbonate production, in particular to a method for producing ultra-high-purity ethyl methyl carbonate through a continuous rectification device. Background technique [0002] Ethyl methyl carbonate is a widely used asymmetric carbonate compound, which is mainly used as a solvent and an intermediate in organic synthesis, especially as a solvent for non-water-soluble electrolytes in lithium batteries. Compared with symmetrical carbonates, it is also It has methyl and ethyl groups, so it has the advantages of both dimethyl carbonate and diethyl carbonate. When used as an electrolyte solvent for lithium-ion batteries, ethyl methyl carbonate has low viscosity, high dielectric constant, and strong solubility to lithium salts, which can improve the energy density and discharge capacity of the battery, improve safety performance and prolong service life. And good low temperature performance. Ethyl...

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Problems solved by technology

[0003] The preparation of high-purity ethyl methyl carbonate generally uses a rectification method that is batch-type. Industrial-grade ethyl methyl carbonate enters the rectification kettle at one time and then undergoes dealcoholization, lightening and refining to obtain high-purity ethyl methyl carbonate. This method The operation time is long and the yield is low, and ethyl methyl carbonate is prone to disproportionation reaction in the tower kettle, resulting in unstable content, and there are certain defects. Therefore, we design a method for producing ultra-high-purity ethyl methyl carbonate through a continuous rectification device

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