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[Chemical Knowledge]：Propylene glycol ether manufacturing method and process flow

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Propylene glycol ether manufacturing method

1. Introduction

Propylene glycol ether is an important chemical production raw materials, widely used in coatings, inks, cleaning agents, printing and dyeing auxiliaries and other fields. In order to meet the market demand and improve production efficiency, this study aims to explore the manufacturing method of propylene glycol ether.

2. Materials and Methods

1. Material

propylene glycol, ethanol, acidic catalyst (such as sulfuric acid, hydrochloric acid, etc.), alkaline absorbent (such as sodium hydroxide, potassium hydroxide, etc.).

2. Equipment

reactor, distillation column, condenser, pump, storage tank, etc.

3. Manufacturing method

(1) Propylene glycol and ethanol are added into a reactor according to a certain proportion and mixed evenly.

(2), an acidic catalyst is added, and the reaction temperature and time are controlled to carry out the esterification reaction.

(3) After completion of the reaction, the acidic catalyst is neutralized by adding a basic absorbent and separated.

(4) Propylene glycol ethyl ether and unreacted raw materials were separated by a rectification operation. The propylene glycol ethyl ether is purified

(5) to obtain a qualified propylene glycol ethyl ether product.

3. Results and Discussion

1. Results

Propylene glycol ether with high purity was successfully produced by the manufacturing method of this study. The following table shows the main performance indicators of propylene glycol ether.

Table 1 Main Performance Indicators of Propylene Glycol Ether

| Items | Indicators |
| --- | --- |
| Appearance | Colorless Transparent Liquid |
| Purity | ≥ 99% |
| Acidity | ≤ 0.01% |
| Moisture | ≤ 0.1% |

.2. Discussion on

(1) During the esterification reaction, the choice and amount of acid catalyst have an important influence on the reaction rate and product purity. In this study, sulfuric acid was used as a catalyst, and the dosage was 1%-2% of the mass of propylene glycol, which achieved good results. The addition of

(2) alkaline absorbent can effectively neutralize the acidic catalyst while avoiding equipment corrosion. In this study, sodium hydroxide was used as an 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 ethyl ether. It is necessary to reasonably control the operating conditions and parameters to ensure the purity and yield of the product.

4. conclusion

In this study, by exploring the manufacturing method of propylene glycol ether, propylene glycol ether with high purity was successfully produced, which provided a useful reference for the field of chemical production. In the actual production process, the manufacturing method can be optimized and adjusted according to specific needs and conditions to improve production efficiency and product quality.

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