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Refining and purifying unit for continuous production of battery grade dimethyl carbonate

A technology of dimethyl carbonate and battery grade is applied in the field of refining and purification devices for continuous production of battery grade dimethyl carbonate, which can solve the problems of generating solid waste, high energy consumption, low yield and the like, and achieve higher sales prices and higher Economic benefits and the effect of solving cumbersome operations

Active Publication Date: 2017-07-14
DONGYING HI TECH SPRING CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purification methods of battery-grade dimethyl carbonate include freeze crystallization, adsorption, batch distillation, etc., but they all have disadvantages such as low yield, high energy consumption, and solid waste generation.

Method used

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  • Refining and purifying unit for continuous production of battery grade dimethyl carbonate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The device uses industrial-grade dimethyl carbonate as a raw material, and adopts a continuous method to refine and purify battery-grade dimethyl carbonate products, including the following steps:

[0035] A) Raw material feed: The raw material feed dimethyl carbonate extracted from the DMC refining tower tank of the industrial-grade dimethyl carbonate unit is pumped to the light removal tower 1 through the conveying pump, and the material is fed from the middle and upper part of the light removal tower 1. Material, control feed rate 1500Kg / h;

[0036] B) Light removal tower operation: control the top operating temperature of light removal tower 1 to 50°C, the operating temperature of the tower bottom of the light removal tower to 60°C, the top operating pressure of the light removal tower: 60KPa, the reflux ratio control: 20, and light removal The dimethyl carbonate material containing light component impurities obtained at the top of the tower, when the analytical pur...

Embodiment 2

[0039] The device uses industrial-grade dimethyl carbonate as a raw material, and adopts a continuous method to refine and purify battery-grade dimethyl carbonate products, including the following steps:

[0040] A) Raw material feed: The raw material feed dimethyl carbonate extracted from the DMC refining tower tank of the industrial-grade dimethyl carbonate unit is pumped to the light removal tower 1 through the conveying pump, and the material is fed from the middle and upper part of the light removal tower 1. Material, control feed rate 1500Kg / h;

[0041] B) Light removal tower operation: control the top operating temperature of light removal tower 1 to 75°C, the operating temperature of the light removal tower bottom to 85°C, the top operating pressure of the light removal tower: 105KPa, the reflux ratio control: 30, and light removal The dimethyl carbonate material containing light component impurities obtained at the top of the tower, when the analytical purity is great...

Embodiment 3

[0044] The device uses industrial-grade dimethyl carbonate as a raw material, and adopts a continuous method to refine and purify battery-grade dimethyl carbonate products, including the following steps:

[0045] A) Raw material feed: The raw material feed dimethyl carbonate extracted from the DMC refining tower tank of the industrial-grade dimethyl carbonate unit is pumped to the light removal tower 1 through the conveying pump, and the material is fed from the middle and upper part of the light removal tower 1. Material, control feed rate 1500Kg / h;

[0046] B) Light removal tower operation: control the operating temperature of the top of the light removal tower 1 to 100°C, the operating temperature of the bottom of the light removal tower to 110°C, the operating pressure of the top of the light removal tower: 150KPa, the reflux ratio control: 40, and light removal The dimethyl carbonate material containing light component impurities obtained at the top of the tower, when the...

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Abstract

The invention relates to a refining purifying device and method used for continuously producing battery grade dimethyl carbonate. The device is characterized in that the top of a light component removal column is connected with an overhead condenser; the overhead condenser is connected with the light component removal column by a first reflux drum and a first reflux pump and is connected with a light component removal outlet; the bottom of the light component removal column is connected with a first reboiler; the first reboiler is used for conveying raw materials subjected to light component removal to a rectifying column via a column reactor pump; the rectifying column is connected with a second reflux drum by a rectifying column condenser; the second reflux drum is connected with the rectifying column by a second reflux pump; the bottom of the separate column reactor is connected with a second column reactor pump by a second reboiler; the middle part of the separate column reactor is connected with a side condenser by a side withdrawing pump. The device and the method have the beneficial effects that the problems of low product purity, low yield, high energy consumption and generation of solid waste pollutants in traditional production processes are solved; the purity of the dimethyl carbonate product is improved 99.99% or more after removing light components by the light component removal column and then carrying out purifying refining by the rectifying column.

Description

technical field [0001] The invention relates to a chemical purification process equipment, in particular to a refining and purifying device for continuous production of battery-grade dimethyl carbonate. Background technique [0002] Battery-grade dimethyl carbonate is an important chemical raw material. As the main component of lithium-ion battery electrolyte, with the development of electronic products and new energy automobile industries, the demand for electrolyte is increasing. The demand for battery-grade dimethyl carbonate products Quality requirements are getting higher and higher. The main impurities in industrial grade dimethyl carbonate are water, methanol, ethanol, ethyl methyl carbonate, heavy component impurities, etc. Alcohols and water affect the service life of lithium-ion batteries, and heavy component impurities affect the discoloration of the electrolyte. Therefore, it is necessary to increase the purity index of dimethyl carbonate and reduce the content ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/96C07C68/08
CPCC07C68/08C07C69/96
Inventor 王春梅滕文彬杜桂强宋世晶房孝敏
Owner DONGYING HI TECH SPRING CHEM IND