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Method of producing ethylene carbonate

A technology of ethylene carbonate and carbon dioxide, which is applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, organic chemistry, etc., can solve the problems of solvent requirement, small pores, poor catalyst stability, etc., and achieve easy The effect of separation and purification, high yield, and less catalyst consumption

Active Publication Date: 2016-07-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the immobilized ionic liquid catalytic system represented by SBA-15 and silica gel, such as small pores, need for solvents, and poor catalyst stability.

Method used

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  • Method of producing ethylene carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Mix 24mL of N-methylimidazole and 20mL of 2-chloroethanol into a round-bottomed flask with a reflux condenser, under nitrogen protection, stir in a water bath at 80°C for 24h, stop the reaction, and dilute the obtained light yellow liquid with diethyl ether repeatedly Extracted 4 times, placed in a vacuum drying oven at 80°C, -0.09MPa and distilled under reduced pressure for 12h to obtain 1-(2-hydroxyethyl)-3-methylchloroimidazolium ionic liquid (HeMIM)Cl with a yield of 94 %.

[0031] Add 3.22g of zirconium oxychloride and 16.10g of water into a 100mL round bottom flask, then add 3.22g of absolute ethanol into the flask, put it into a heating magnetic stirrer and heat to 60°C. When the mixed system becomes clear, add the ionic liquid [HeMIM]Cl (the molar ratio of [HeMIM]Cl to zirconium oxychloride is 2:1). Under the action of stirring, it gradually becomes an oil bead-like suspension system. Continue stirring for 4 hours, the color of the system gradually becomes ligh...

Embodiment 2

[0034] Put 9.63mL of N-ethylimidazole in a 100ml three-neck flask, add 9.5g of chloroacetic acid in three batches, and after the chloroacetic acid is completely dissolved, place the reaction in a water bath at 70°C for 10 hours to obtain a light yellow liquid. Pour it into a beaker and wash it repeatedly with ether for 3 times, put it in a vacuum drying oven at 80°C and -0.09MPa for 12h under reduced pressure to obtain 1-carboxyethyl-3-ethylimidazolium chloride ionic liquid (CeEIM)Cl, Yield 91%.

[0035] Add 3.22g of zirconium oxychloride and 16.10g of water into a 100mL round bottom flask, then add 3.22g of absolute ethanol into the flask, put it into a heating magnetic stirrer and heat to 60°C. When the mixed system becomes clear, add the ionic liquid [CeEIM]Cl (the molar ratio of [CeEIM]Cl to zirconium oxychloride is 2:1), and it starts to form an oily bead-like liquid. White foam appears after 80 minutes, and a small part of it solidifies after 100 minutes. . After react...

Embodiment 3

[0038] In the same equipment used in Example 2, under the same conditions, just change N-ethylimidazole into N-methylimidazole, and change the amount of ionic liquid added, the amount of [CeEIM]Cl and zirconium oxychloride The molar ratio was changed to 1:1, and the catalyst obtained was a zirconium-type chlorinated 1-carboxyethyl-3-methylimidazolium ionic liquid [CeMIM]Cl-Zr, and the catalytic reaction was nearly 40 minutes without any change in the carbon dioxide mass flow counter value. After the completion of the reaction, the purity of the ethylene carbonate product was measured to be 98.6%, the calculated ethylene oxide conversion rate was 98.0%, and the ethylene carbonate yield was 96.8%.

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Abstract

The invention relates to a method of producing ethylene carbonate by catalytic addition from ethylene oxide and CO2. In the method, under the effect of an environment-friendly ionic liquid catalyst, the CO2 and the ethylene oxide are added to prepare the ethylene carbonate. When the reaction temperature is 90-130 DEG C, the reaction pressure is 1-3 MPa, the stirring speed is 200-300 r / min and the reaction time is 1-2 h, the conversion rate of the ethylene oxide reaches more than 98% and the yield of the ethylene carbonate reaches more than 94%. Conversion rate and yield are both higher than 90% even the catalyst is repeatedly used for seven times.

Description

technical field [0001] The invention relates to a method for preparing ethylene carbonate by catalytic addition of ethylene oxide and carbon dioxide. Background technique [0002] Ethylene carbonate is a good solvent for the production of polyamide, polyacrylonitrile, polyvinyl chloride and other high polymers. It can also be used as spinning liquid and other chemical auxiliary agents in textiles. It can also be used as a solvent for removing industrial acid gases and Additives for concrete. In medicine, it can be used as a pharmaceutical component and an organic synthesis intermediate, and can also be used as a plastic foaming agent and a stabilizer for synthetic lubricating oil. In the capacitor battery industry, the mixed solution of EC and propylene carbonate has a high dielectric constant and can be used as an electrolyte for lithium batteries. With the increasing popularity of mobile phones and computers, the market demand and development potential are huge. In recen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38B01J31/38B01J31/02
Inventor 贺俊海史君郭立颖程光剑吕洁石鸣彦李志宇李民娄阳曹微
Owner PETROCHINA CO LTD
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