Manufacturing method of propylene glycol ethyl ether
I. Introduction
Propylene glycol ethyl ether 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. In order to meet the market demand and improve the production efficiency, this study aims to explore the manufacturing method of propylene glycol ethyl ether.
II. MATERIALS AND METHODS
1. MATERIALS
Propylene glycol, ethanol, acidic catalysts (e.g., sulfuric acid, hydrochloric acid, etc.), alkaline absorbents (e.g., sodium hydroxide, potassium hydroxide, etc.).
2. Equipment
Reactor, distillation column, condenser, pump, storage tank, etc.
3. Manufacturing method
(1) Add propylene glycol and ethanol to the reactor in a certain proportion and mix well.
(2) Add acid catalyst, control certain reaction temperature and time, and carry out esterification reaction.
(3) After the reaction, alkaline absorbent is added to neutralize the acidic catalyst and separation is carried out.
(4) Propylene glycol ethyl ether and unreacted raw material are separated by distillation operation.
(5) The propylene glycol ethyl ether was purified to obtain a qualified propylene glycol ethyl ether product.
III. RESULTS AND DISCUSSION
1. RESULTS
Propylene glycol ethyl ether with high purity was successfully produced by the manufacturing method of this study. The following table shows the main performance indexes of propylene glycol ethyl ether.
Table 1 Main performance indexes of propylene glycol ethyl ether
|Item |Indicator |
| --- |--- |
| Appearance |Colorless transparent liquid |
| Purity | ≥99% |
| Acidity | ≤0.01% |
| Moisture | ≤0.1% |
2. Discussions
(1) In the process of esterification reaction, the selection of acidic catalysts and the amount of acid catalysts has an important influence. In this study, sulfuric acid was used as the catalyst, and the dosage was 1%-2% of the mass of propylene glycol, which achieved better results.
(2) The addition of alkaline absorber can effectively neutralize the acidic catalyst and avoid the corrosion of equipment. In this study, sodium hydroxide was used as the absorbent, and the dosage was 2%-3% of the mass of propylene glycol.
(3) Distillation operation is a key step in the process of manufacturing propylene glycol ether, which requires reasonable control of operating conditions and parameters to ensure the purity and yield of the product.
IV.Conclusion
This study successfully produced propylene glycol ethyl ether with high purity by exploring the manufacturing method of propylene glycol ethyl ether, which provides a useful reference for the field of chemical production. In the actual production process, the manufacturing method can be optimized and adjusted according to the specific needs and conditions to improve the production efficiency and product quality.
