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[Chemical Knowledge]：Manufacturing method and process flow of diethylene glycol monobutyl ether

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The manufacturing method
of diethylene glycol monobutyl ether
1. Introduction

diethylene glycol monobutyl ether (Diethylene Glycol Monobutyl ether, referred to as DGBE) is a commonly used chemical production raw material, widely used in coatings, inks, cleaning agents, dyes, pesticides and other fields. This article will introduce the manufacturing method of diethylene glycol monobutyl ether, including raw material preparation, reaction process, post-treatment and product quality control.

2. raw material preparation

1. diethylene glycol: choose high purity diethylene glycol, ensure low impurity content, in order to improve product quality.
2. n-butanol: Select high-quality n-butanol to ensure the quality of alcohol to avoid affecting the reaction.

3. reaction process

1. feeding: the metering good diethylene glycol and butanol into the reaction kettle.
2. Stirring: Turn on the stirrer to mix the raw materials thoroughly.
3. Heating: The reaction kettle is heated to control the reaction temperature between 120-150 ℃.
4. Reflux: When the temperature in the reaction kettle reaches the set value, the reflux device is opened to reflux the water vapor generated by the reaction to the reaction kettle to promote the reaction.
5. Dehydration: When the reaction proceeds to a certain extent, gradually increase the temperature to 180-200°C, so that the remaining water is evaporated and discharged.
6. Cooling: After completion of the reaction, the reaction kettle was cooled to room temperature.

4. Post-treatment

1. Layering: The cooled reaction liquid was allowed to stand for layering, and the water in the upper layer and the diethylene glycol monobutyl ether in the lower layer were separated.
2. Distillation: The lower layer of diethylene glycol monobutyl ether was distilled to collect the fraction having a boiling point between 170 and 180 ° C. to obtain pure diethylene glycol monobutyl ether.

5. product quality control

1. Purity: Through gas chromatography and other analytical methods, the purity of the product is detected to ensure that the purity reaches more than 99%.
2. Moisture: Control the moisture content in the product to ensure the stability of the product.
3. Chromaticity: Chromaticity detection of products to ensure that the product chromaticity meets relevant standards.
4. Acidity: test the acidity of the product to ensure that the acid content of the product is within the specified range.

6. precautions

1. Strictly control the reaction temperature and time to avoid the occurrence of side reactions.
2. In the process of heating and cooling, keep the normal operation of the agitator to prevent the raw material from coking or deposition.
3. During the layering process, ensure that the standing time is sufficient to allow sufficient separation of moisture and diethylene glycol monobutyl ether.
4. During the distillation process, control the distillation speed and the temperature range of the collected fraction to ensure product quality.

7. Conclusion

High-purity diethylene glycol monobutyl ether can be obtained by the above production method. In the production process, strict control of raw material quality, reaction conditions, post-treatment process and product quality can improve product yield and quality, reduce costs, and create better economic benefits for enterprises.

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