Manufacturing method of dipropylene glycol ethyl ether
I. INTRODUCTION
Dipropylene glycol ethyl ether (DPGBE) is an important raw material for the production of chemicals, which is widely used in the fields of coatings, inks, detergents, printing and dyeing auxiliaries and so on. With the growing market demand, it is important to study the manufacturing method of dipropylene glycol ethyl ether to improve the production efficiency, reduce the cost and improve the product quality. In this paper, the manufacturing method of dipropylene glycol ethyl ether will be introduced in detail, including raw material preparation, reaction process, post-treatment and product quality control.
II. Raw material preparation
The main raw materials for manufacturing dipropylene glycol ethyl ether include: propylene glycol, ethylene oxide, catalyst and so on. Among them, the molar ratio of propylene glycol and ethylene oxide needs to be controlled within a certain range to ensure the smooth progress of the reaction. The selection of catalyst should be made according to the specific reaction conditions and requirements.
3. Reaction process
1. Addition of catalyst: add the catalyst into the reaction kettle and stir well.
2. Mixing of propylene glycol and ethylene oxide: add propylene glycol and ethylene oxide into the reaction kettle after mixing proportionally.
3. Warming up reaction: heat up the reaction kettle, control the reaction temperature in the appropriate range, so that the addition reaction between propylene glycol and ethylene oxide occurs.
4. Decompression distillation: After the reaction, carry out decompression distillation, separate out the unreacted raw materials and by-products, and get the crude dipropylene glycol ethyl ether.
4. Post-treatment
1. Washing: The crude dipropylene glycol ethyl ether is washed with alkali to remove the acid in it.
2. Dewatering: Remove water from dipropylene glycol ethyl ether by adding desiccant or using molecular sieve etc.
3. Distillation: carry out distillation on the dehydrated dipropylene glycol ethyl ether to get the product with higher purity.
V. Product quality control
In order to ensure the product quality of dipropylene glycol ether, its purity, acidity, moisture and other indicators need to be tested. Purity can be detected by gas chromatography; acidity can be detected by acid-base titration; moisture can be detected by Karl Fischer method. According to the test results, the production process is adjusted to ensure stable product quality.
VI. Optimization of production process
In order to improve the production efficiency of dipropylene glycol ethyl ether, reduce the cost and improve the product quality, the production process can be optimized. Specific measures include:
1. Choose suitable catalyst to improve the reaction rate and selectivity.
2. Optimize the reaction temperature and time to improve the reaction efficiency.
3. Adopting advanced separation technology to improve product purity and yield.
4. Strengthen the monitoring of production process to ensure stable product quality.
VII. Safe production and environmental protection
In the production process of dipropylene glycol ethyl ether, attention should be paid to safe production and environmental protection. Ensure that the production equipment meets the safety standards and the operation is standardized to avoid the occurrence of production accidents. At the same time, strengthen the treatment and recycling of waste water, waste gas, waste residue and other wastes to reduce the impact of production on the environment.
VIII.CONCLUSION
Dipropylene glycol ethyl ether, as an important raw material for the production of chemicals, its manufacturing method is of great significance for improving production efficiency, reducing costs and improving product quality. The production level and market competitiveness of dipropylene glycol ethyl ether can be further improved by mastering the suitable manufacturing method, optimizing the production process and strengthening the safety production and environmental protection.
