Manufacturing method of Diethylene Glycol Monobutyl Ether
I. Introduction
Diethylene Glycol Monobutyl Ether (DGBE) is a commonly used raw material for the production of chemicals, which is widely used in the fields of coatings, printing ink, detergents, dyes, pesticides and so on. This article will introduce the manufacturing method of DGBE, including raw material preparation, reaction process, post-treatment and product quality control.
II. Raw material preparation
1. Diethylene glycol: use high purity diethylene glycol to ensure low impurity content to improve product quality.
2. n-Butanol: choose high quality n-Butanol to ensure the quality of alcohol to avoid affecting the reaction generation.
3. Reaction process
1. Feeding: add the measured di-ethylene glycol and n-butanol into the reaction kettle.
2. Stirring: turn on the stirrer to mix the raw materials fully.
3. Heating: Heat the reaction kettle and control the reaction temperature between 120-150℃.
4. Refluxing: When the temperature in the reaction kettle reaches the set value, turn on the refluxing device to make the water vapor generated by the reaction reflux into the reaction kettle to promote the reaction.
5. Dewatering: When the reaction is carried out to a certain extent, gradually increase the temperature to 180-200℃, so that the remaining water can be evaporated and discharged.
6. Cooling: After the reaction, cool the reactor to room temperature.
Four, post-processing
1. layering: after cooling the reaction liquid static layering, separation of the upper layer of water and the lower layer of diethylene glycol monobutyl ether.
2. Distillation: distill the lower layer of Diethylene Glycol Monobutyl Ether, collect the fractions with boiling point between 170-180℃, and get the pure Diethylene Glycol Monobutyl Ether.
V. Product quality control
1. Purity: Test the purity of the product by gas chromatography and other analytical methods 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. Colorimetry: Colorimetry testing of the products to ensure that the colorimetry of the products meets the 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. Keep the stirrer in normal operation during heating and cooling to prevent coking or deposition of raw materials.
3. During layering, ensure that the resting time is sufficient to allow adequate separation of water and Diethylene Glycol Monobutyl Ether.
4. During distillation, control the distillation rate and the temperature range at which the fractions are collected to ensure product quality.
VII.CONCLUSION
By the above manufacturing method, high purity diethylene glycol monobutyl ether can be obtained. In the manufacturing process, strict control of raw material quality, reaction conditions, post-treatment process and product quality can improve the yield and quality of the product, reduce the cost and create better economic benefits for the enterprise.
