Method for continuously preparing ethylene carbonate

A technology of ethylene carbonate and ethylene oxide, which is applied in the field of continuous preparation of ethylene carbonate, can solve problems such as slow reaction rate, achieve the effects of reducing risk, shortening residence time, and improving catalytic activity

Inactive Publication Date: 2020-03-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Research on catalysts improves CO 2 The problem of slow cycloaddition reaction rate in the synthesis process of epoxides, but in the traditional tank reactor, the gas phase CO 2 The mass transfer problem with liquid ethylene oxide becomes the key to the rapid synthesis of cyclic carbonates

Method used

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  • Method for continuously preparing ethylene carbonate

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Experimental program
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Effect test

Embodiment 1

[0039] (1) prepare catalyst solution A: take 100g of ethylene carbonate, heat to 34~50 ℃, weigh catalyst 36g, water 7.5g and join in ethylene carbonate successively, obtain catalyst solution A after thermal insulation stirring 1~2min, density About 1.24 ~ 1.26g / mL.

[0040] (2) Using CO 2 Mass flow meter delivers CO at standard flow rate of 470mL / min 2 Entering the reaction system, there is CO at the exit 2 After the gas is ejected, open the back pressure valve, and the back pressure is 3MPa.

[0041] (3) The catalyst solution A prepared in the step (1) and the ethylene oxide are respectively passed into the micro-mixer a at 0.3 mL / min and 1 mL / min to obtain the ethylene oxide mixed solution B in which the catalyst is dissolved .

[0042] (4) The mixed solution B of ethylene oxide obtained in step (3) is used as continuous phase, gas CO 2 As the dispersed phase, it is continuously passed into the micro-mixer b to obtain the gas-liquid mixture C, and the mixed liquid C is ...

Embodiment 2

[0045] refer to figure 1 Shown technique continuously prepares ethylene carbonate, a kind of method for continuously preparing ethylene carbonate, comprises the following steps:

[0046] (6) prepare catalyst solution A: take 100g of ethylene carbonate, heat to 34~50 ℃, weigh catalyst 36g, water 7.5g and join in ethylene carbonate successively, obtain catalyst solution A after thermal insulation stirring 1~2min, density About 1.24 ~ 1.26g / mL.

[0047] (7) Using CO 2 Mass flow meter delivers CO at standard flow rate of 645mL / min 2 Entering the reaction system, there is CO at the exit 2 After the gas is ejected, open the back pressure valve, and the back pressure is 3MPa.

[0048] (8) The catalyst solution A prepared in the step (1) and the ethylene oxide are passed into the micro-mixer a at 0.3 mL / min and mL / min, respectively, to obtain the ethylene oxide mixed solution B that the catalyst is dissolved in. .

[0049] (9) The mixed solution B of ethylene oxide obtained in s...

Embodiment 3

[0052] refer to figure 1 Shown technique continuously prepares ethylene carbonate, a kind of method for continuously preparing ethylene carbonate, comprises the following steps:

[0053] (1) Preparation of catalyst solution A: take by weighing 100 g of ethylene carbonate, heat to 34~50° C., weigh 36 g of catalyst and add it to ethylene carbonate, 7.5 g of water, keep stirring for 1~2min to obtain catalyst solution A, with a density of about It is 1.20~1.26g / mL.

[0054] (2) Using CO 2 Mass flowmeter delivers CO at standard flow rate of 940mL / min 2 Entering the reaction system, there is CO at the exit 2 After the gas is ejected, open the back pressure valve, and the back pressure is 3MPa.

[0055] (3) The catalyst solution A prepared in the step (1) and the ethylene oxide are respectively passed into the micro-mixer a at 0.3 mL / min and mL / min to obtain the ethylene oxide mixed solution B in which the catalyst is dissolved. .

[0056] (4) The mixed solution B of ethylene o...

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Abstract

The invention relates to a method for continuously preparing ethylene carbonate. The method comprises the following steps: (1) mixing ethylene carbonate with a catalyst and water to obtain a catalystsolution A; (2) introducing CO2 into a reaction system, and performing back pressure regulation on the pressure of the reaction system to a required pressure by using a back pressure valve; (3) introducing the catalyst solution A and ethylene oxide into a micro-mixer, and quickly and uniformly mixing to obtain an ethylene oxide mixed solution B in which a catalyst is dissolved; (4) continuously introducing the mixed solution B and CO2 gas into a micro-mixer to obtain a gas-liquid mixture C, and enabling the gas-liquid mixture C to enter a tubular reactor for reaction; (5) introducing an obtained reaction liquid into a flash tank, and carrying out flash evaporation to separate out unreacted ethylene oxide, CO2 and water to obtain a primary product; and (6) rectifying the primary product obtained in the step (5) to obtain the product ethylene carbonate. The method is safe and efficient, and the reaction residence time is greatly shortened; the reaction efficiency is high, and the conversion rate of ethylene oxide is close to 100% in a short reaction residence time.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and particularly relates to a safe, efficient, fast and controllable method for continuously preparing ethylene carbonate. Background technique [0002] Ethylene carbonate is an excellent solvent and raw material for surfactants, especially for many polymers and resins. Water glass slurry, fiber finishing agent and other fiber processing agent, can be used as spinning liquid in textile, can also be directly used as solvent for removing acid gas and additive for concrete, can also be used as plastic foaming agent and Stabilizer for synthetic lubricants. In addition, ethylene carbonate can also be used as a high value-added high-energy battery electrolyte. [0003] Despite being considered the culprit behind global warming, carbon dioxide is an economical C1 resource. It is rich in source, non-toxic and renewable. In recent decades, the conversion of carbon dioxide into valuable chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38
CPCC07D317/38
Inventor 丁云成李蓝王祁宁艾宁
Owner ZHEJIANG UNIV OF TECH
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