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Synthesizing process of polyethandiol mono methyl ether

A technology of polyethylene glycol monomethyl ether and ethylene glycol methyl ether, applied in the field of preparation of polyethylene glycol monomethyl ether, can solve problems such as limitations, and achieve the effects of low cost and simple operation

Active Publication Date: 2007-07-18
ZHEJIANG HUANGMA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes polyethylene glycol monomethyl ether limited in many applications, especially in concrete additives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First wash the reactor twice with anhydrous methanol, dry it, and after cooling (temperature below 30°C), add 40g of methanol, 5g of 30% sodium methoxide methanol solution, raise the temperature to 60°C, and add 1331g of ethylene oxide in batches, After adding and aging, wait for the pressure to drop to the point where it cannot be lowered, then cool down and degas to discharge the material.

Embodiment 2

[0014] First wash the reactor twice with absolute ethanol, dry it, after cooling (temperature below 30°C), add 25g of methanol, 5g of 30% sodium methoxide methanol solution, heat up to 60°C, add 1450g of ethylene oxide in batches, After adding and aging, wait for the pressure to drop to the point where it cannot be lowered, then cool down and degas to discharge the material.

Embodiment 3

[0016] First wash the reaction kettle twice with absolute ethanol, dry it, and add 80 g of polyethylene glycol monomethyl ether prepared in Example 1 after cooling (below 70° C.), 5 g of 30% sodium methoxide methanol solution, and heat up to 80 ℃, dehydration for 40 minutes, then add 1450g of ethylene oxide in batches, finish adding and ripening, wait until the pressure drops to the point where it cannot be lowered, then cool down and degas and discharge.

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PUM

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Abstract

The preparation process of polyethylene glycol monomethyl ether belongs to the field of ether compound synthesizing technology in organic chemistry. The preparation process includes the first washing reactor for 1-5 times with low boiling point solvent methanol, ethanol, propanol, etc; and the subsequent the reaction of ethylene oxide with one kind of initial material of methanol, polyethylene glycol monomethyl ether, diethylene glycol methyl ether, triethylene glycol methyl ether, etc in the presence of catalyst of solid sodium methoxide, methanol solution of sodium methoxide, KOH, NaOH, etc. The preparation process is reasonable and high in reaction activity, and the polyethylene glycol monomethyl ether has lowered polyethylene glycol content.

Description

technical field [0001] The invention relates to a preparation method of polyethylene glycol monomethyl ether, which belongs to the technical field of synthesis of ether compounds in organic chemistry. Background technique [0002] As we all know, the content of polyethylene glycol (PEG) in the prepared polyethylene glycol monomethyl ether is very high by washing the reactor with water, and then using KOH, NaOH or sodium methoxide as a catalyst. The content of PEG in polyethylene glycol monomethyl ether is 4-25%. With the increase of molecular weight, the content of PEG increases accordingly. This makes polyethylene glycol monomethyl ether limited in many application fields, especially in concrete additives. Therefore it is imperative to reduce the PEG content in polyethylene glycol monomethyl ether. Contents of the invention [0003] The purpose of the present invention is to provide a kind of technology reasonable, high reactivity, the synthetic method of the polyethyle...

Claims

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Application Information

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IPC IPC(8): C08G65/04
Inventor 王伟松王新荣孟照平马定连曹海洋钱建方
Owner ZHEJIANG HUANGMA TECH
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