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Method and apparatus for rectifying purification of battery grade dimethyl carbonate

A technology of dimethyl carbonate and a purification method, which is applied in the field of battery-grade dimethyl carbonate rectification and purification, can solve the problems of high production energy consumption and large equipment investment, and achieves reduction of equipment investment, meeting separation requirements, and reducing equipment investment. Effect

Inactive Publication Date: 2017-11-28
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a battery-grade dimethyl carbonate rectification purification method and equipment to solve the problems of large equipment investment and high production energy consumption in the existing battery-grade dimethyl carbonate purification process

Method used

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  • Method and apparatus for rectifying purification of battery grade dimethyl carbonate
  • Method and apparatus for rectifying purification of battery grade dimethyl carbonate
  • Method and apparatus for rectifying purification of battery grade dimethyl carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Purification of 15,000 tons / year of dimethyl carbonate, wherein the feed composition and related parameters are as follows:

[0055] Crude dimethyl carbonate feed composition: methanol 1%, ethanol 1%, water 1%, dimethyl carbonate 95%, ethyl methyl carbonate 1%, diethyl carbonate 1%. The feed flow rate is 2 tons / hour.

[0056] Atmospheric pressure dividing wall rectifying tower top pressure is normal pressure, tower top temperature is 66.6 ℃, reflux / feed amount (L / F)=5.1; Low pressure dividing wall rectifying tower tower top pressure is 10kPa, tower top temperature is 25.1 °C, reflux / feed (L / F) = 8.2.

[0057] The heat load of the atmospheric pressure dividing wall rectification tower and the low pressure dividing wall rectification tower used for the production of battery-grade dimethyl carbonate is shown in Table 1. Since the separation process utilizes differential pressure thermal coupling technology, the atmospheric pressure dividing wall rectification tower The c...

Embodiment 2

[0062] Purification of 15,000 tons / year of dimethyl carbonate, wherein the feed composition and related parameters are as follows:

[0063] Crude dimethyl carbonate feed composition: methanol 0.8%, ethanol 1.2%, water 1.1%, dimethyl carbonate 95%, ethyl methyl carbonate 1.4%, diethyl carbonate 0.5%. The feed flow rate is 2 tons / hour.

[0064] Atmospheric pressure dividing wall rectifying tower top pressure is normal pressure, tower top temperature is 67.7 ℃, reflux / feed amount (L / F)=5.3; Low pressure dividing wall rectifying tower top pressure position is 15kPa, tower top temperature is 32.9 °C, reflux / feed (L / F) = 9.0.

[0065] The heat load of the atmospheric pressure dividing wall rectifying tower and the low pressure dividing wall rectifying tower used for the production of battery-grade dimethyl carbonate is shown in Table 2. Since this separation process utilizes differential pressure thermal coupling technology, the atmospheric pressure dividing wall rectifying tower ...

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Abstract

The invention provides a method and apparatus for rectifying purification of battery grade dimethyl carbonate. The apparatus comprises a normal-pressure dividing wall rectification tower, a low-pressure dividing wall rectification tower, a tower bottom reboiler, an auxiliary condenser, a tower top condenser and a condensation reboiler. A crude dimethyl carbonate raw material is added into the normal-pressure dividing wall rectification tower from the middle part and undergoes separation in the above two towers, low boiling products are removed from the tower top, high boiling products are removed from the tower bottom, and a highly-pure dimethyl carbonate product is extracted from the side line of the low-pressure tower. A dividing wall rectification technology is adopted to save two distillation towers, two reboilers and two condensers, and a differential pressure heat coupling technology is adopted to save one condenser, so the device investment is reduced; the differential pressure heat coupling technology is adopted to heat the tower bottom material of the low-pressure tower by using the tower top gas phase material of the normal-pressure tower as a heat source, so energy matching is achieved, and the energy consumption is reduced; and the dividing wall rectification technology and the differential pressure heat coupling technology are effectively combined, so the energy consumption is greatly reduced, and the device investment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of rectification and separation, and in particular relates to a rectification and purification method and equipment for battery-grade dimethyl carbonate. Background technique [0002] In recent years, with the increasingly serious energy crisis and increasing environmental pollution, lithium battery new energy has attracted more and more attention from all over the world. Lithium-ion batteries are favored by the market because of their high energy density, high voltage, excellent electrical properties and environmental friendliness. Dimethyl carbonate is used as the main solvent of lithium-ion battery electrolyte, and its purity directly determines the cycle life, high and low temperature performance and safety performance of lithium-ion batteries. [0003] Traditional dimethyl carbonate purification methods mainly include pressure swing rectification, extractive distillation and crystallization, etc., but ...

Claims

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Application Information

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IPC IPC(8): C07C69/96C07C68/08B01D3/14
CPCB01D3/007B01D3/146C07C68/08C07C69/96
Inventor 王红星李海勇李飞
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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