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Method and system for separating and recovering top gas of ethylene oxide stripping tower

A technology for separation and recovery of ethylene oxide, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc. The effect of reducing cooling water consumption, optimizing energy saving and reducing operating costs

Active Publication Date: 2017-04-19
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcoming is that although the output from the ethylene oxide refining tower tank has undergone a series of heat exchanges, the temperature is still 64°C before entering the reabsorption water cooler, and it needs to be cooled to the required temperature by cooling water. The required 38°C consumes more cooling water
Its shortcoming is that compared with the operating conditions of the ethylene glycol feed stripping tower, the current feed temperature is low, which increases the direct stripping steam volume of the tower accordingly, and also increases the wastewater in the subsequent ethylene glycol section. emissions
[0004] Neither of the above two places has made full use of energy, which is not conducive to energy saving and consumption reduction of the system, and increases operating costs

Method used

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  • Method and system for separating and recovering top gas of ethylene oxide stripping tower
  • Method and system for separating and recovering top gas of ethylene oxide stripping tower

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Experimental program
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Effect test

specific Embodiment approach

[0037] A kind of embodiment of the inventive method comprises the following steps:

[0038] (1), the ethylene oxide stripping tower top gas 1 is sent to the ethylene oxide reabsorption tower 2 of a low-pressure operation, in this tower, ethylene oxide is washed down again with reabsorbed water, thereby in the tower Top removal of light components gas 3. In order to ensure the reabsorption effect, the tower still needs to be provided with an external ethylene oxide reabsorption tower tower cooler 5, and the ethylene oxide reabsorption tower tower still pump 4 is used to transfer more than 70% of the tower still liquid through The ethylene oxide reabsorption tower tank cooler 5 is cooled and circulated back to the ethylene oxide reabsorption tower 2 to remove the heat in the absorption process. The light component gas 3 at the top of the ethylene oxide reabsorption tower 2 is circulated back to the ethylene oxide reaction system (not shown) after being pressurized; ℃ The feeds...

Embodiment approach

[0047] According to a preferred embodiment of the system of the present invention, the system can also include an ethylene oxide refining tower inlet / outlet heat exchanger 12 and an ethylene oxide refining tower side line reboiler 21; the second pipeline 27 And the third pipeline 28 can pass through the ethylene oxide refining tower inlet / outlet heat exchanger 12 so that heat exchange can be carried out between the second pipeline 27 and the third pipeline 28; The line 28 and the side line 29 drawn from the middle of the ethylene oxide refining tower 13 can pass through the side line reboiler 21 of the ethylene oxide refining tower so that the third line 28 and the side line 29 can be carried out Heat exchange; the feed preheater 24 can be located at the ethylene glycol feed stripper 7 side of the third pipeline 28, and the ethylene oxide refining tower inlet / outlet heat exchanger 12 can be located at the third On one side of the ethylene oxide reabsorption tower 2 of the pipe...

Embodiment

[0054] Such as figure 2 As shown, the gas phase (temperature 59°C) from the top of the ethylene oxide stripping tower enters the bottom of the ethylene oxide reabsorption tower, and the composition is as follows: ethylene oxide accounts for about 91wt%, water accounts for about 6.5wt%, and light components points (ethylene, CO 2 , methane, argon, etc.) accounts for about 2.5wt%. The tower is a packed tower (pressure range is 0.016-0.023MPaG, temperature range is 38-46°C), the number of theoretical plates is 15, and the reabsorbed water at about 38°C It is fed from the top of the tower, and the ethylene oxide in the gas phase feed is washed down again, thereby removing light components at the top of the tower. In order to ensure the effect of reabsorption, the tower still needs to be equipped with an external ethylene oxide reabsorption tower reactor cooler, and the ethylene oxide reabsorption tower tower reactor pump is used to transfer more than 70% of the tower reactor liq...

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Abstract

The invention discloses a method and system for separating and recovering top gas of an ethylene oxide stripping tower. The system comprises an ethylene oxide re-absorbing tower, a glycol feed stripping tower, an ethylene oxide refining tower and a feed preheater. The method comprises the following steps: subjecting a feed of the ethylene oxide stripping tower from the ethylene oxide re-absorbing tower and bottom discharge from the ethylene oxide refining tower to heat exchange to 48 to 60 DEG C in the feed preheater; and then sending the feed into the glycol feed stripping tower for stripping. The system employs the method for separation and recovery of top gas of the ethylene oxide stripping tower, so energy conservation and consumption reduction are realized, and operation cost of equipment is reduced.

Description

technical field [0001] The invention relates to a method and system for separating and recovering ethylene oxide stripping tower top gas. Background technique [0002] Industrially, a system for energy utilization between the ethylene oxide reabsorber, ethylene glycol feed stripper, and ethylene oxide refining tower on an ethylene oxide / ethylene glycol (EO / EG) system, The output of the tower kettle of the ethylene oxide refining tower is about 147°C. After being pressurized by the tower kettle pump of the ethylene oxide refining tower, the ethylene oxide is firstly heated by the inlet / outlet heat exchanger of the ethylene oxide refining tower Feed to the refining tower and cooled to 110°C, then used as the heating heat source for the side line reboiler of the ethylene oxide refining tower was further cooled to 64°C, and then mixed with 38°C reabsorbed water returned from the ethylene glycol section, passed through After the reabsorption water cooler is cooled to 38°C, it is...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/32C07C31/20C07C29/80
CPCC07C29/80C07D301/32C07D303/04C07C31/202
Inventor 王炜刘洁王艳丽赵鉴楚
Owner SINOPEC ENG
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