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[Chemical Knowledge]：Manufacturing method and process flow of ethylene glycol dimethyl ether

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Manufacturing method

of ethylene glycol dimethyl ether (DME) is an important organic chemical raw material, which is widely used in solvent, fuel, medicine, pesticide and other fields. In the field of raw materials for chemical production, a method for producing ethylene glycol dimethyl ether has attracted much attention. This article will introduce the manufacturing method of ethylene glycol dimethyl ether in detail.

1. raw materials and equipment

1. raw materials: ethylene glycol, methanol, sulfuric acid, sodium hydroxide and so on.
2. Equipment: reaction kettle, condenser, water separator, storage tank, pump, etc.

2. Manufacturing Process

1. Esterification Reaction

Ethylene glycol and methanol are mixed in a molar ratio of 1:2, and an appropriate amount of sulfuric acid is added as a catalyst. Esterification reaction is carried out under normal pressure and 80-90 ℃ to generate ethylene glycol dimethyl ester.

precautions: The amount of sulfuric acid and the reaction temperature need to be strictly controlled to avoid excessive esterification and side reactions.

2. Alcoholysis reaction

Ethylene glycol dimethyl ester and methanol are mixed in a molar ratio of 1:1, and an appropriate amount of sodium hydroxide is added as a catalyst to carry out the alcoholysis reaction under normal pressure and 80-90 ℃ to generate ethylene glycol dimethyl ether and methanol.

precautions: It is necessary to control the amount of sodium hydroxide and the reaction temperature to avoid excessive alcoholysis and side reactions. At the same time, the reaction solution needs to be neutralized to remove the remaining acid and alkali.

3. Distillation and purification

The reaction solution is rectified and purified. First, methanol and unreacted ethylene glycol are distilled off, and then the fractions of ethylene glycol dimethyl ether are collected to obtain ethylene glycol dimethyl ether products with higher purity.

precautions: It is necessary to control the distillation temperature and pressure to ensure the purity and yield of the product.

3. safety and environmental protection

1. In the manufacturing process, it is necessary to strictly abide by the safety operation procedures to avoid fire, explosion and other safety accidents.
2. It is necessary to treat waste water, waste gas and other wastes to reduce environmental pollution.

4. quality control

need to strictly control the quality of ethylene glycol dimethyl ether products, including purity, moisture, acidity, chroma and other indicators. The quality of the product can be detected and monitored by analytical means such as gas chromatography and mass spectrometry.

In summary, the manufacturing method of ethylene glycol dimethyl ether involves multiple process steps and operation details, and it is necessary to strictly control factors such as raw material quality, reaction conditions, and equipment operation to ensure product quality and yield. At the same time, it is necessary to strengthen safety and environmental protection management, comply with relevant laws, regulations and standards, and ensure the smooth progress of the production process.

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