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[Chemical Knowledge]：Production and manufacturing method and process flow of hexylene glycol

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Hexylene Glycol (HG) is an important chemical raw material, which is widely used in solvents, plasticizers, humectants, preservatives and other fields. This article will introduce the manufacturing method of hexylene glycol in detail, including raw material preparation, reaction process, post-treatment and precautions.

1. raw material preparation

1. Ethylene oxide: ethylene oxide is the main raw material for the production of hexanediol, with high activity, can with water, alcohol and other compounds ring-opening addition reaction.
2. 1,6-Hexanediol: 1,6-Hexanediol is an initiator for hexanediol production and is used to promote the ring-opening polymerization of ethylene oxide.

2. Reaction Process

Hexanediol is produced primarily by the ring-opening addition reaction of ethylene oxide with water in the presence of an acidic catalyst. The specific steps are as follows:

1. Add 1,6-hexanediol to a reactor, and then add an appropriate amount of acidic catalyst, such as sulfuric acid or phosphoric acid.
2. Ethylene oxide is slowly added dropwise with stirring to control the reaction temperature within an appropriate range.
3. Continue to stir and heat preservation, so that the full reaction of ethylene oxide, the generation of hexylene glycol.

3. post-treatment
After the end of the
reaction, a post-treatment is required to obtain a pure hexylene glycol product. The specific steps are as follows:

1. Neutralize the acidic catalyst in the reactor with a basic absorbent to inactivate it.
2. The reaction solution is distilled to separate unreacted raw materials and by-products.
3. Hexanediol products with higher purity were obtained by distillation.

4. precautions

1. During the operation, the reaction temperature should be strictly controlled to avoid the formation of by-products caused by high temperature.
2. The amount of acid catalyst should be appropriate, too much will lead to equipment corrosion, too little may affect the reaction rate.
3. In the post-treatment process, it is necessary to ensure complete neutralization to avoid the influence of acid catalyst on the quality of the product.

In short, the manufacturing process of hexylene glycol requires strict control of reaction conditions to ensure product quality. Through the manufacturing method introduced in this paper, high-purity hexylene glycol can be produced, which provides high-quality raw materials for chemical production.

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