Method of purifying ethylene carbonate, process for producing purified ethylene carbonate and ethylene carbonate

A technology of ethylene carbonate and purification method, applied in the field of purification of ethylene carbonate

Active Publication Date: 2009-04-01
MITSUBISHI RAYON CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even if this method is used for the purification of ethylene carbonate, only ethylene carbonate with a purity of 99.67% by weight is obtained (Patent Document 3)

Method used

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  • Method of purifying ethylene carbonate, process for producing purified ethylene carbonate and ethylene carbonate
  • Method of purifying ethylene carbonate, process for producing purified ethylene carbonate and ethylene carbonate

Examples

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Embodiment 1

[0058] As a crystallization device, use the figure 1 Same device. The inner diameter of the tower (1) is 200mm, and the effective height is 2000mm (the height from the top of the dissolving part of the lower part of the tower to the height of the tower top), and thermocouple thermometers are arranged at intervals of 25 cm in the height direction inside. Warm water (52.3° C. at the inlet of the heating coil, 49.5° C. at the outlet of the heating coil, and a flow rate of 200 L / hour) was passed into the heater (2) (heating coil) as a heat medium. The heat supplied by the heating coil is: (flow rate) x (specific heat of water) x (coil inlet temperature - coil outlet temperature) = 200L hr -1 ×1.00kcal·L -1 ·℃ -1 ×(52.3-49.5)℃=560kcal·hr -1. The stirring device (7) uses a stirring shaft with horizontal stirring bars as stirring wings. The tower (1) is covered with an insulating material, but a slit-shaped window is provided in the vertical direction so that the state of cryst...

Embodiment 2

[0071] EC was purified in the same manner as in Example 1 except for the conditions shown in Table 1. As a result, MEG in EC was 7 wtppm, and the compounds shown in Table 2 were below the detection limit (5 wtppm). The detailed data are shown in the table below. In addition, in the research conducted by the inventors of the present invention, when the monoethylene glycol in EC is several tens of ppm, diethylene glycol and triethylene glycol in EC are not detected, and it is considered to be The detection limit (5 wtppm) or less.

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Abstract

Ethylene carbonate in which the content of especially diols has highly been reduced is provided. There is provided a method of purifying ethylene carbonate, including causing crude ethylene carbonate crystal to descend from a superior part of tower, melting the crude ethylene carbonate crystal in a tower bottom, withdrawing portion of the obtained melt from the tower, causing the rest of the melt to ascend as a reflux liquid and realizing countercurrent contact of the melt with the descending crude ethylene carbonate crystal, characterized in that a solid / liquid countercurrent contact region of constant temperature is created.

Description

technical field [0001] The present invention relates to a method for purifying ethylene carbonate, a method for producing purified ethylene carbonate, and ethylene carbonate. Background technique [0002] Cyclic carbonates such as ethylene carbonate, propylene carbonate, and butylene carbonate can be used as solvents for various polymer compounds, reaction solvents for various chemical reactions, extractants, foaming agents, and lubricating oil stabilizers. Ethylene carbonate is usually synthesized by reacting ethylene oxide and carbon dioxide under high temperature and pressure. Therefore, glycols such as ethylene glycol and diethylene glycol derived from these synthetic raw materials are contained in ethylene carbonate. In addition, ethylene carbonate contains a trace amount of water together with the above-mentioned impurities, and this water reacts with ethylene carbonate to further produce the above-mentioned diols. [0003] Ethylene carbonate used as various solvents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38B01D9/02
CPCB01D9/0045B01D9/0013C07D317/38B01D9/004B01D9/02C07C68/08C07C69/52
Inventor 山岸昌彦古屋俊行须田英希
Owner MITSUBISHI RAYON CO LTD
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