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Method for separating and recovering EO (ethylene oxide) from direct oxidation products of ethylene

A technology of ethylene oxide and oxidation products, applied in organic chemistry and other directions, can solve problems such as poor absorption capacity, and achieve the effects of improving absorption capacity, significant economic and environmental benefits, and increasing operational flexibility and safety.

Inactive Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of using water as the absorbent in the current industry and its poor absorption capacity, aiming to provide a method for separating and reclaiming ethylene oxide from the direct oxidation product of ethylene

Method used

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  • Method for separating and recovering EO (ethylene oxide) from direct oxidation products of ethylene
  • Method for separating and recovering EO (ethylene oxide) from direct oxidation products of ethylene
  • Method for separating and recovering EO (ethylene oxide) from direct oxidation products of ethylene

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Pure propylene carbonate was used as the absorption solvent. The EO-lean absorbing liquid (4) enters the top of the T1 tower with a pressure of 1.3MPa at a flow rate of 12.5g / min, and the mixed raw material gas (1) containing 2.83% ethylene oxide flows from the bottom of the T1 tower at a rate of 5.7L / The min flow is passed into the tower, and the liquid-gas mass ratio is 1.75 at this time. Control the absorption temperature to 35.2°C. After the mixed feed gas (1) and the lean EO absorbing liquid (4) fully contact in the tower, ethylene oxide in the mixed feed gas (1) is absorbed into the liquid phase by the lean EO absorbing liquid (4), and the tower top absorbs the tail gas ( 3) discharged from the top of the tower, after analysis, the content of ethylene oxide in the absorption tail gas (3) is 135ppm. After exchanging heat with the EO-rich absorbing liquid (2) at the bottom of the tower and the EO-lean absorbing liquid (4), it is heated to 103°C and enters the str...

Embodiment 2

[0026] Pure ethylene carbonate was used as the absorption solvent. The EO-lean absorbing liquid (4) enters the top of the T1 tower with a pressure of 1.3 MPa at a flow rate of 12.5g / min, and the mixed raw material gas (1) containing 2.83% ethylene oxide flows from the bottom of the T1 tower at a rate of 5.7L / The min flow is passed into the tower, and the liquid-gas mass ratio is 1.75 at this time. Control the absorption temperature to 40°C. After the mixed raw material gas (1) and EO-poor absorbing liquid (4) fully contact in the tower, the ethylene oxide in the mixed raw material gas (1) is absorbed into the liquid phase by the EO-poor absorbing liquid (4), and the tail gas is absorbed at the top of the tower ( 3) It is discharged from the top of the tower. After analysis, the content of ethylene oxide in the absorption tail gas (3) is 673ppm. After exchanging heat with the EO-rich absorbing liquid (2) at the bottom of the tower and the EO-lean absorbing liquid (4), it is ...

Embodiment 3

[0029]Ethylene carbonate and water are mixed uniformly in a ratio of 4:6 as the absorption solvent. Lean EO absorbing liquid (4) enters the T1 tower tower top that tower top pressure is 1.3MPa with the flow rate of 12.5g / min, and the mixed raw material gas (1) that contains 2.83% ethylene oxide is by T1 tower tower bottom with 5.7L / The min flow is passed into the tower, and the mass liquid-gas ratio is 1.75 at this time. Control the absorption temperature to 35.3°C. After the mixed feed gas (1) and the lean EO absorbing liquid (4) fully contact in the tower, ethylene oxide in the mixed feed gas (1) is absorbed into the liquid phase by the lean EO absorbing liquid (4), and the tower top absorbs the tail gas ( 3) discharged from the top of the tower, after analysis, the content of ethylene oxide in the absorption tail gas (3) is 348ppm. The bottom stream of the EO-rich absorbing liquid (2) is heated to 95°C after exchanging heat with the EO-lean absorbing liquid (4), and then...

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Abstract

The invention relates to a method for separating and recovering EO (ethylene oxide) from direct oxidation products of ethylene. The method comprises the following steps of: taking a mixed solvent of ethylene carbonate and water as an absorbing solvent, enabling the absorbing solvent to enter from a tower top of an absorption tower, introducing mixed raw material gas into the tower from a tower bottom of the absorption tower, enabling the mixed raw material gas to be in full contact with an EO-lean absorption solution in the absorption tower, enabling the EO in the mixed raw material gas to be absorbed by the EO-lean absorption solution and further enter a liquid phase, and exhausting absorption tail gas from the tower top; and enabling an EO-rich absorption solution at the tower bottom of the absorption tower to perform heat exchange and then enter the tower top of a stripping tower, stripping by taking steam or nitrogen as stripping gas, extracting a gas phase material flow from the tower top, cooling, then recovering, and enabling the EO-lean absorption solution to perform heat exchange with the EO-rich absorption solution after stripping at the tower bottom and then return to the tower top of the absorption tower so as to be recycled as an absorbent. According to the method disclosed by the invention, the absorbing ability of the absorbent against the EO can be greatly improved, the residual EO content in the absorption tail gas can be reduced, the elasticity and safety in the operation of devices can be increased, the material consumption and the energy consumption can be effectively reduced, and the benefits are significant.

Description

technical field [0001] The invention relates to a method for separating and recovering ethylene oxide from the direct oxidation product of ethylene, which can be applied to the ethylene oxide absorption / stripping system in the current industrial EO / EG device and the separation and recovery of ethylene oxide in all mixed gases. field of ethane. Background technique [0002] At present, large-scale plants producing ethylene glycol at home and abroad all use the process route of direct hydration of ethylene oxide, and ethylene oxide is produced by direct oxidation of ethylene on a silver-containing catalyst, and the reaction produces ethylene oxide at the same time , Ethylene can also be oxidized to produce by-products such as carbon dioxide and water. In order to obtain refined ethylene oxide, the ethylene oxide in the mixed gas must first be absorbed by the ethylene oxide absorbent in the ethylene oxide absorption tower, and then through stripping, concentration, refining, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/32
Inventor 赵克品陈玮娜李军马颖涛
Owner CHINA PETROLEUM & CHEM CORP
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