Process of reutilization of poly ethylene glycol monomethyl ether byproducts from the reaction of methanol and ethylene oxide

A technology of polyethylene glycol methyl ether and polyethylene glycol dimethyl ether, which is applied in the field of organic chemical industry, can solve the problems of shrinking market consumption and product composition distribution that cannot meet market demand, and achieve the effect of reducing comprehensive production costs

Inactive Publication Date: 2004-08-18
JIANGSU YIDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the market consumption of ethylene glycol methyl ether is gradually shrinking, on the other hand, the market consumption of triethylene glycol methyl ether is steadily e

Method used

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Examples

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example 1

[0031] In a four-necked flask with a stirrer, heating and cooling device, add polyglycol methyl ether 500g, and use N 2 Replace the air in the reactor, add 120g of NaOH, raise the temperature to 60°C under rapid stirring, keep the temperature at 60-100°C for 4 hours, then slowly introduce 107g of methyl chloride within 4 hours, control the reaction temperature at 60-100°C, and the reaction pressure is Under normal pressure, stop the flow of methyl chloride and continue to stir and react for 1h, cool down to below 40°C, filter, and carry out vacuum distillation on the filtrate below 4mmHg to obtain 502g of ethylene glycol dimethyl ether. The raffinate in the distilling bottle is 23g, and the yield is greater than 95%.

example 2

[0033] In a 1L stainless steel reaction kettle with a stirrer, heating and cooling device, add polyglycol methyl ether 500g, and use N 2 Replace the air in the reactor, add 120g of NaOH, heat up to 60°C under rapid stirring, keep warm at 60-100°C for 4 hours, then slowly introduce 107g of methyl chloride within 4 hours, control the reaction temperature at 60-100°C, and the reaction pressure is less than 0.1MPa, stop the flow of methyl chloride and continue stirring for 1h, cool down to below 40°C, filter, and carry out vacuum distillation of the filtrate below 4mmHg to obtain 510g of ethylene glycol dimethyl ether. The raffinate in the distilling bottle is 15g, and the yield is greater than 97%.

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Abstract

The present invention relates to the utilization of polyglycol methyl ether as the side product of reaction between methanol and ethylene epoxide. The side product is used as material to prepare polyglycol dimethyl ether through the steps of reaction with sodium or potassium hydroxide, sodium methoxide and metallic sodium to prepare polyglycol methyl ether sodium or polyglycol methyl ether potassium; the subsequent Williamson reaction with alkylating agent, filtering out sodium salt or potassium salt as side product, dewatering, decolorizing with active carbon or acid white clay, adsorption and high vacuum decompression distillation. The alkylating agent is chloromethane, dimethyl sulfate or dimethyl carbonate. The utilization of the side product can reduce the comprehensive cost.

Description

Technical field: [0001] The invention relates to a method for reusing polyglycol methyl ether, a by-product of the reaction between methanol and ethylene oxide. It belongs to the field of organic chemical technology. Background technique: [0002] The known method of synthesizing ethylene glycol methyl ether is, take methyl alcohol and oxirane as raw material, carry out following reaction under the effect of catalyst: [0003] <chemistry num="001"> <chem file="200310121648_cml001.xml" / > < / chemistry> (n=1~5) [0004] Simultaneous reactions of ethylene oxide with methanol and ethylene oxide with glycols result in the formation of mono-, di-, and triethylene glycol methyl ethers and higher molecular weight alcohol ethers. Excess methanol tends to decrease to generate a higher proportion of glycol ether. The molar ratio of methanol to ethylene oxide generally used in industry is 3 to 6. Ethylene glycol methyl ether is the main product, and diethylene glyco...

Claims

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Application Information

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IPC IPC(8): C07C41/18C07C43/11C07F1/04C07F1/06
Inventor 朱新宝刘准
Owner JIANGSU YIDA CHEM
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