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Preparation method of ethylene glycol monovinyl ether

A technology of ethylene glycol monovinyl ether and ethylene glycol, applied in the field of preparation of ethylene glycol monovinyl ether, can solve problems such as inapplicability, and achieve the effects of less by-products, stable reaction, and low equipment pressure requirements

Active Publication Date: 2021-02-02
BOAI NKY PHARMA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In US2019053A, US2066076A, GB427036A, etc., it is mentioned that a substance with a large surface area such as activated carbon is used as a basic catalyst carrier to react with acetylene in the gas phase after the alcohol is vaporized. The temperature is about 200°C, but ethylene glycol monovinyl ether will transform into 2-methyl-1,3-dioxolane at high temperature, so the gas phase reaction is not suitable for the synthesis of ethylene glycol monovinyl ether

Method used

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  • Preparation method of ethylene glycol monovinyl ether
  • Preparation method of ethylene glycol monovinyl ether
  • Preparation method of ethylene glycol monovinyl ether

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Dissolve 28g of potassium hydroxide in 2000g of ethylene glycol, add it to a 4L reactor, raise the temperature and replace it with nitrogen at the same time, then replace the nitrogen with acetylene, raise the temperature to 180°C, pressure 0MPaG, control the flow rate of acetylene to 240L / h, and react For 6 days, ethylene glycol was continuously added during the reaction process, and ethylene glycol was preheated by the preheater and then added to the reactor to keep the reaction liquid level in the reactor unchanged, and replaced on the 2nd and 4th days 651g of reaction solution and 13g of potassium hydroxide was supplemented at the same time. The new reaction solution was preheated in the preheater, and then added to the reactor. The reaction product was continuously taken out of the reactor by acetylene, and formed after distillation and condensation. Liquid, the mass content of 2-methyl-1,3-dioxolane in the collected liquid obtained in the receiver is 0.23%, the mas...

Embodiment 2

[0040] Dissolve 53g of sodium hydroxide in 2000g of ethylene glycol, add it into a 4L reactor, raise the temperature and replace it with nitrogen at the same time, then replace the nitrogen with acetylene, raise the temperature to 175°C, pressure 0.03MPaG, control the flow rate of acetylene to 270L / h, React for 6 days, add ethylene glycol continuously in the reaction process, add ethylene glycol into the reactor after being preheated by the preheater, make the liquid level of the reaction liquid in the reactor remain unchanged, and respectively in the 2nd day and the 4th day Replace 1000g of reaction solution and add 30g of sodium hydroxide at the same time. The new reaction solution is preheated in the preheater, and then added to the reactor. The reaction product is continuously taken out of the reactor by acetylene, and formed after distillation and condensation. Collected liquid, the mass content of 2-methyl-1,3-dioxolane in the collected liquid obtained in the receiver is ...

Embodiment 3

[0042] Dissolve 122g of sodium hydroxide in 2000g of ethylene glycol, add it to a 4L reactor, raise the temperature and replace it with nitrogen at the same time, then replace the nitrogen with acetylene, raise the temperature to 170°C, pressure 0.02MPaG, control the flow rate of acetylene to 300L / h, React for 6 days, add ethylene glycol continuously in the reaction process, add ethylene glycol into the reactor after being preheated by the preheater, make the liquid level of the reaction liquid in the reactor remain unchanged, and respectively in the 2nd day and the 4th day Replace 1000g of reaction solution and add 35g of sodium hydroxide at the same time. The new reaction solution is preheated in the preheater, and then added to the reactor. The reaction product is continuously taken out of the reactor by acetylene, and formed after distillation and condensation. Collection liquid, the mass content of 2-methyl-1,3-dioxolane in the collection liquid obtained in the receiver is...

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Abstract

The invention belongs to the technical field of chemical engineering, and discloses a preparation method of ethylene glycol monovinyl ether, which comprises the following steps: 1) dissolving a basiccatalyst in ethylene glycol to form a reaction material, 2) adding the reaction material into a reactor, removing air in the reactor, continuously introducing acetylene for reaction, and continuouslysupplementing ethylene glycol in the reaction process to keep the liquid level of the reaction liquid in the reactor unchanged, 3) continuously taking the reaction product out of the reactor by acetylene, and distilling and condensing to form a collected liquid, and 4) rectifying the collected liquid to obtain ethylene glycol monovinyl ether. The preparation method provided by the invention has the advantages of high safety, few byproducts, simple raw materials and stable reaction, and can realize continuous production of ethylene glycol monovinyl ether.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of ethylene glycol monovinyl ether. Background technique [0002] Ethylene glycol monovinyl ether, also known as 2-ethyleneoxyethanol, is an organic raw material. Due to its structural characteristics, the vinyl group can be used for polymerization, and the hydroxyl group is hydrophilic, so it can be used as an industrial water reducer precursor raw materials. With the development of China's construction market, the demand for water reducing agents is increasing, and the demand for ethylene glycol monovinyl ether as a precursor raw material for a new generation of water reducing agents will also increase. [0003] Vinyl ethers are usually produced by the addition reaction of alcohol and acetylene under a catalyst, but generally the reaction efficiency is low and the yield is poor, or the catalyst used is more complicated or a precious m...

Claims

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Application Information

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IPC IPC(8): C07C43/178C07C41/08
CPCC07C41/08C07C43/178
Inventor 史海峰张玉玺张戈孙旭东刘小波李强
Owner BOAI NKY PHARMA LTD
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