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A kind of preparation method of ethylene glycol dimethyl ether

A technology of ethylene glycol dimethyl ether and ethylene glycol monomethyl ether, which is applied in the field of preparation of ethylene glycol dimethyl ether, can solve the problems of increased production cost, unreasonable production process, and ineffective use of sodium chloride, etc. Achieve the effects of reducing side reactions, improving raw material utilization, and reducing waste

Active Publication Date: 2018-03-30
熙旺(上海)能源科技研发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In traditional methods, due to poor control of reaction conditions or unreasonable production process design, the by-products of sodium chloride usually appear reddish-brown, and the decolorization treatment of sodium chloride is relatively complicated, which will greatly increase production costs. Basic loss of economic value
Since the by-product sodium chloride cannot be effectively used in industrialization, it is an extremely unreasonable production process, let alone clean production

Method used

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  • A kind of preparation method of ethylene glycol dimethyl ether
  • A kind of preparation method of ethylene glycol dimethyl ether
  • A kind of preparation method of ethylene glycol dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 1Kg of ethylene glycol monomethyl ether liquid into the reaction kettle, then put 0.263Kg caustic soda into the reaction kettle while stirring, and turn on the cooling water of the reaction kettle at the same time, control the temperature in the reaction kettle at 18~19°C, wait for caustic soda When the solid disappears completely, add 0.263Kg of caustic soda again, continue to stir, and control the temperature in the reaction kettle within the range of 27-29°C, and continue to stir for 20 minutes when all caustic soda disappears, so that all components can fully react. Then, slowly feed monochloromethane gas into the reactor to keep the pressure in the reactor at 0.05-0.5 MPa. Since a large amount of heat will be released during the aeration reaction, it is necessary to open a large amount of condensed water to keep the internal temperature of the reactor at 70 ~75°C, ventilation time is 8 hours. After aeration, the mixed liquid was distilled, and the distillate wa...

Embodiment 2

[0021] Put 1.7Kg ethylene glycol monomethyl ether liquid in the reaction kettle, then drop 0.447Kg caustic soda into the reaction kettle while stirring, open the cooling water of the reaction kettle at the same time, control the temperature in the reaction kettle at 18°C, and wait for the caustic soda to solidify When the caustic soda disappears completely, add 0.447Kg of caustic soda again and continue to stir while controlling the temperature in the reaction kettle within the range of 27-28°C. When caustic soda completely disappears, continue to stir for 25 minutes to fully react the components. Then, slowly feed monochloromethane gas into the reactor to keep the pressure in the reactor at 0.05-0.5MPa. Since a large amount of heat will be released during the aeration reaction, it is necessary to open a large amount of condensed water to keep the internal temperature of the reactor at 74 ~75°C, ventilation time is 8 hours. After aeration, the mixed liquid was distilled, and t...

Embodiment 3

[0023] Put 2.3Kg ethylene glycol monomethyl ether liquid into the reaction kettle, then put 0.605Kg caustic soda into the reaction kettle while stirring, turn on the cooling water of the reaction kettle at the same time, control the temperature in the reaction kettle at around 18°C, wait for the caustic soda When the solid disappears completely, add 0.605Kg of caustic soda again and continue to stir while controlling the temperature in the reaction kettle within the range of 27-28°C. When all caustic soda disappears, continue to stir for 30 minutes to fully react the components. Then, slowly feed monochloromethane gas into the reactor to keep the pressure in the reactor at 0.05-0.5MPa. Since a large amount of heat will be released during the aeration reaction, it is necessary to open a large amount of condensed water to keep the internal temperature of the reactor at 73 ~75°C, ventilation time is 8 hours. After aeration, the mixed liquid was distilled, and the distillate was d...

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Abstract

The present invention discloses a method for producing glycol dimethyl ether, and belongs to the technical field of ether organic compound synthesis. The method is as below: first adding a certain amount of ethylene glycol monomethyl ether to a reaction kettle, adding for the first time a certain amount of in the ethylene glycol monomethyl ether caustic soda and stirring; cooling the reaction solution temperature to 15-20 DEG C; adding a certain amount of caustic soda for the second time and stirring; cool the reaction system, and controlling the temperature of the reaction solution at 25-30 DEG C; reacting to form ethylene glycol monomethyl ether sodium salt; introducing methyl chloride gas to the ethylene glycol monomethyl ether sodium salt solution to precipitate white sodium salt crystals slowly, wherein the reaction liquid is a colorless or very light pale yellow; filtering the reaction liquid to obtain a filter cake of clean sodium chloride and a filtrate of an ethylene glycol dimethyl ether solution of sodium chloride; and distilling the filtrate to obtain an effluent of glycol dimethyl ether product. The method of the present invention can obtain high purity by-product sodium chloride, and realize clean production of glycol dimethyl ether.

Description

technical field [0001] The invention belongs to the technical field of synthesis of ether organic compounds, and in particular relates to a preparation method of ethylene glycol dimethyl ether. Background technique [0002] Ethylene glycol dimethyl ether is a colorless neutral liquid with an ether-like odor, with a boiling point of 83°C at normal pressure and a density of 0.87g / cm at 25°C 3 , its chemical properties are very stable, often used as an aprotic polar solvent, can dissolve various resins and cellulose, and can also be miscible with water, alcohols, hydrocarbons, ethers, esters, ketones, etc. in any proportion. [0003] At present, the industrial production method of ethylene glycol dimethyl ether is mainly Williamson synthesis method, and halogenated hydrocarbon selects methyl chloride for use, and in order to reduce production cost, generally use caustic soda sodium hydroxide as raw material in industry, but this method can produce more By-products require a la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/10C07C41/01
CPCC01D3/04C07C41/01C07C43/13C07C43/10
Inventor 张千峰王猛陈向莹王培坤
Owner 熙旺(上海)能源科技研发有限公司
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