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Ethylene oxide purification method

A technology of ethylene oxide and separation method, applied in the direction of organic chemistry and the like, can solve the problems of low absorption rate and removal rate of ethylene oxide and high energy consumption, and achieve good absorption effect, low energy consumption and good separation effect. Effect

Active Publication Date: 2019-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses certain types of liquids called ionic liquids that dissolve both water (H2O) and ethylenoxides effectively at room temperatures without causing any damage or affecting their properties like chemical structure. These materials work well even if they don't come into contact during processing due to factors such as humidity or impurities added by other components involved in the manufacturing processes themselves. Overall, this method allows for efficient removal of unwanted substances while minimizing waste compared to traditional methods involving organics.

Problems solved by technology

This patented technical problem addressed in this patent relates to improving efficiency when extracting or concentrating lower alcohol levels of ethylenoxides during industrial production processes such as polymerization. Current methods involve adding excessive amounts of water that can cause issues like decreased yield rates and increased energy usage compared to desired products. To address this issue, there has been developed new types of absorbants called organozinc acetone complex salt (ZA), but they have limitations in terms of their ability to dissolve higher molecular weight compounds effectively without causing thermal degradations over time.

Method used

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Examples

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Embodiment 1

[0026] 50°C low-concentration ethylene oxide (molar concentration: 1mol% EO, 10% CO) from the outlet of the reactor 2 , 22%C 2 h 4 , 5%O 2 , 55% CH 4 , 7% Ar) into the absorption tower, the operating pressure is 20bar, and the absorbent is 50% 1-hexyl-3-methylimidazolium hexafluorophosphate ([hmim][PF 6 ]) and 50% triethylene glycol dimethyl ether (TEGDM), and the feed gas mass ratio is 3; after the absorption process, ethylene oxide in the oxirane removal gas is 30ppm, and the ethylene oxide absorption rate is 99.9% or more. The rich liquid enters the 2bar flash tank, and most of the CO in the absorbent 2 , C 2 h 4 , O 2 , CH 4 and Ar are desorbed; the absorption liquid is heated to 100°C and enters a 0.01bar desorption tower, and the molar concentration of 92% ethylene oxide at the top of the tower enters the subsequent ethylene oxide purification section, and the removal rate of ethylene oxide is at More than 99%, the lean liquid in the tower kettle is cooled to 5...

Embodiment 2

[0028] 60°C low-concentration ethylene oxide (molar concentration: 1mol% EO, 10% CO) from the outlet of the reactor 2 , 22%C 2 h 4 , 5%O 2 , 55% CH 4, 7% Ar) into the absorption tower, the operating pressure is 20bar, and the absorbent is 70[hmim][PF 6 ] and 30% TEGDM, with a mass ratio of 3 to the feed gas; after the absorption process, the ethylene oxide in the ethylene oxide gas is 25ppm, and the ethylene oxide absorption rate is above 99.9%. The rich liquid enters the 2bar flash tank, and most of the CO in the absorbent 2 , C 2 h 4 , O 2 , CH 4 and Ar are desorbed; the absorption liquid is heated to 100°C and enters a 0.01bar desorption tower, and the molar concentration of 92% ethylene oxide at the top of the tower enters the subsequent ethylene oxide purification section, and the removal rate of ethylene oxide is at More than 99%, the lean liquid in the tower kettle is cooled to 60°C by heat exchange and returned to the absorption tower.

Embodiment 3

[0030] 80°C low-concentration ethylene oxide (molar concentration: 1mol% EO, 10% CO) from the outlet of the reactor 2 , 22%C 2 h 4 , 5%O 2 , 55% CH 4 , 7% Ar) into the absorption tower, the operating pressure is 20bar, and the absorbent is 80[hmim][PF 6 ] and 20% TEGDM, with a mass ratio of 5 to the feed gas; after the absorption process, the ethylene oxide in the ethylene oxide gas is 30ppm, and the ethylene oxide absorption rate is above 99.9%. The rich liquid enters the 2bar flash tank, and most of the CO in the absorbent 2 , C 2 h 4 , O 2 , CH 4 and Ar are desorbed; the absorption liquid is heated to 100°C and enters a 0.01bar desorption tower, and the molar concentration of 92% ethylene oxide at the top of the tower enters the subsequent ethylene oxide purification section, and the removal rate of ethylene oxide is at More than 99%, the lean liquid in the tower kettle is cooled to 80°C by heat exchange and returned to the absorption tower.

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Abstract

Ethylene oxide purification method. The invention relates to a separation method of ethylene oxide, which mainly solves the problems of high energy consumption, low ethylene oxide absorption rate andlow removal rate in the prior art. The invention aims at the low-concentration ethylene oxide product at the outlet of an ethylene oxide reactor, and the low-concentration ethylene oxide is separatedand enriched by adopting a mixed absorbent of an ionic liquid with anion as hexafluorophosphate radical and triethylene glycol dimethyl ether. Compared with the traditional process using water or ethylene carbonate as absorbent, the process flow is simplified, the separation efficiency is higher, and the process has industrial application potential.

Description

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Claims

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Application Information

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Owner CHINA PETROLEUM & CHEM CORP
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