Method for separating ethylene glycol mixture series

A separation method and mixture technology, applied in the preparation of organic compounds, ether separation/purification, chemical instruments and methods, etc., can solve problems such as high energy consumption, low separation purity, and complicated separation process

Active Publication Date: 2014-04-02
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the separation process of the existing ethylene glycol mixture system is complicated, the separation purity is not high, the investment is large, and the energy consumption is high. A new separation method of the ethylene glycol mixture system is provided

Method used

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  • Method for separating ethylene glycol mixture series
  • Method for separating ethylene glycol mixture series
  • Method for separating ethylene glycol mixture series

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] use figure 2 The flow shown is based on the 500,000 tons / year ethylene glycol plant, and the materials whose weight percentage composition is shown in Table 1 are separated. The dividing wall rectification column (packed column) used has 51 theoretical plates, and a partition is set in the dividing wall section. There are 13 theoretical plates on both sides of the dividing wall section, and the dividing plates are installed along the center line of the tower. There are 18 theoretical plates in the section, the operating pressure is 1 kPa absolute pressure at the top of the tower, and the reflux ratio is 0.55 by weight; the feed is fed to the 24th tray, and the extraction position of the side line DEG is the 26th block from the top of the tower. theory board.

[0040] For comparison, the operating conditions and separation results are listed in Table 17.

[0041] The detailed component separation effect of the corresponding dividing wall rectification column is as follo...

Embodiment 1）

[0046] Device No

Embodiment 2

[0048] According to the conditions described in Example 1, the total number of theoretical plates of the dividing wall rectification column, the number of theoretical plates on both sides of the dividing plate, the feed position, the side draw position and the reflux ratio were changed.

[0049] The dividing wall type rectifying column (packed column) that adopts has 55 theoretical plates, each has 15 theoretical plates on both sides of the partition of the dividing wall, and the stripping section has 21 theoretical plates, and the reflux ratio is 0.65 by weight; The 24th tray is fed, and the extraction position of the side line DEG is the 27th theoretical tray from the top of the tower.

[0050] For comparison, the operating conditions and separation results are listed in Table 17.

[0051] The detailed component separation effect of the corresponding dividing wall rectification column is as follows:

[0052] Table 7: Detailed table of separation results of dividing wall rec...

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Abstract

The invention relates to a method for separating ethylene glycol mixture series, mainly solving the problems of complex separation flow of existing ethylene glycol mixture series, low separation purity, high investment and high energy consumption. The above technical problems are well solved by adopting the method characterized by using a mixture containing mono ethylene glycol (MEG), diethylene glycol (DEG) and poly(ethylene glycol) (TEG) as the raw material, enabling the raw material to firstly enter one side of a dividing wall section of a dividing wall rectifying column, obtaining a material flow containing DEG on the other side of the dividing wall section through separation, obtaining a material flow containing TEG at the bottom of a stripping section below the dividing wall section of the dividing wall rectifying column and obtaining a material flow containing MEG at the top of a rectifying section above the dividing wall section of the dividing wall rectifying column. The method can be used for separating the ethylene glycol mixture series.

Description

technical field [0001] The invention relates to a separation method of ethylene glycol mixture system. Background technique [0002] In the traditional ethylene glycol separation technology route, the mixture of monoethylene glycol, diethylene glycol and polyethylene glycol is separated in the MEG tower, and the product MEG is output from the side line of the tower, and the top of the tower is dehydrated. The output of the tower kettle is mainly composed of MEG, Composition of DEG and TEG. The output from the MEG tower reactor enters the MEG recovery tower for the next step of separation. The top of the MEG recovery tower mainly produces MEG and a small amount of DEG, and the output from the tower reactor is mainly composed of DEG and TEG. The material discharged from the bottom of the MEG recovery tower enters the DEG tower for the next step of separation, the DEG product is discharged from the top of the DEG tower, and the TEG is discharged from the bottom of the tower. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/11C07C41/42C07C31/20C07C29/80
CPCC07C29/80C07C41/42C07C43/11C07C31/202
Inventor 张永生陈益
Owner SINOPEC SHANGHAI ENG
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