Mono-ethylene glycol purification and recovery method

A monoethylene glycol and polyethylene glycol technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of complex separation process, low separation purity, and large investment.

Active Publication Date: 2015-02-25
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 existing separation process is complex, the separation purity is not high, the investment is large, and the energy consumption is high. A new method for purifying and recovering monoethylene glycol is provided

Method used

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  • Mono-ethylene glycol purification and recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 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) adopted has 55 theoretical plates, 15 theoretical plates are respectively arranged on both sides of the dividing plate in the dividing wall section, and there are 10 theoretical plates in the stripping section under the dividing plate, and the operating pressure is 5.73 at the top of the tower. Absolute pressure in kilopascals, reflux ratio is 13 by weight; at the 25th block tray feeding, rectification section side line extraction position is the 8th theoretical plate counted downward from the top of the tower, and the extraction position of the partition wall section side line is from The 33rd theoretical plate is counted downward from the top of the tower.

[0044] For comparison, the operating conditions and separation results are listed in...

Embodiment 2

[0051] According to the conditions described in Example 1, the total number of theoretical plates, the number of theoretical plates on both sides of the partition and the reflux ratio of the dividing wall rectification column were changed. The dividing wall type rectifying tower (packed tower) that adopts has 60 theoretical plates, respectively has 20 theoretical plates on both sides of the dividing plate of the dividing wall, and the stripping section under the dividing plate has 10 theoretical plates, and the reflux ratio is calculated as 15.

[0052] For comparison, the operating conditions and separation results are listed in Table 11.

[0053] The detailed component separation effect of the corresponding dividing wall rectification column is shown in Table 7, and the energy consumption is shown in Table 8.

[0054] Table 7 Detailed table of separation results of dividing wall distillation column

[0055]

[0056] Table 8 Energy consumption analysis table for the proc...

Embodiment 3

[0059] According to the conditions described in Example 1, the total number of theoretical plates, the number of theoretical plates on both sides of the partition and the reflux ratio of the dividing wall rectification column were changed. The dividing wall rectifying column (packed tower) that adopts has 50 theoretical plates, respectively has 13 theoretical plates on both sides of the dividing plate of the dividing wall, and the stripping section under the dividing plate has 7 theoretical plates, and the reflux ratio is calculated as 14.

[0060] For comparison, the operating conditions and separation results are listed in Table 11.

[0061] The detailed component separation effect of the corresponding dividing wall rectification column is shown in Table 9, and the energy consumption is shown in Table 10.

[0062] Table 9 Detailed table of separation results of dividing wall distillation column

[0063]

[0064] Table 10 Energy consumption analysis table for the process...

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Abstract

The invention relates to a mono-ethylene glycol purification and recovery method and aims to mainly solve the problems of complexity, low separation purity, large investment and high energy consumption of existing separation processes. The mono-ethylene glycol purification and recovery method includes: taking a mixture containing water, MEG (mono-ethylene glycol), DEG (diethylene glycol) and TEG (triethylene glycol) as raw materials, enabling the raw materials to enter one side of a dividing-wall section of a dividing-wall distillation column for separation, withdrawing recovered MEG products from the other side of the dividing-wall section, obtaining material flow containing the DEG and the TEG from the bottom of a stripping section below the dividing-wall section of the dividing-wall distillation column, obtaining material flow containing the water and the MEG from the top of a distillation section above the dividing-wall section of the dividing-wall distillation column, and performing side withdrawing to obtain MEG products from the distillation section above the dividing-wall section of the dividing-wall distillation column. According to the technical scheme, the mono-ethylene glycol purification and recovery method well solves the above technical problems and can be used for purification and recovery of mono-ethylene glycol.

Description

technical field [0001] The invention relates to a method for purifying and recovering monoethylene glycol. Background technique [0002] In the traditional ethylene glycol separation technology route, the mixture of water, monoethylene glycol, diethylene glycol, and polyethylene glycol is separated in the MEG rectification tower, and the product MEG is produced from the side line of the tower, dehydrated at the top of the tower, and discharged from the bottom of the tower Mainly a mixture of MEG, DEG and TEG. The discharge from the bottom of the MEG distillation tower enters the MEG recovery tower to recover most of the MEG. The top of the MEG recovery tower mainly produces MEG and a small amount of DEG, and the discharge from the bottom of the tower is mainly composed of DEG and TEG. [0003] The dividing wall rectification column is a complete heat integration tower with a new structure that divides the column into four parts: the upper section, the lower section, the rec...

Claims

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Application Information

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