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[Chemical Knowledge]：Manufacturing method and process of neopentyl glycol

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Manufacturing Methods

of Neopentyl Glycol Neopentyl Glycol (NPG) is an important chemical raw material, which is widely used in polyurethane, plastics, coatings and other fields. This paper will introduce the manufacturing method of neopentyl glycol, including its raw materials, process flow, reaction principle, equipment, operation steps, control methods and safety production.

1. raw material

neopentyl glycol manufacturing raw materials are mainly isobutyraldehyde and formaldehyde. Among them, isobutyraldehyde can be obtained by naphtha cracking or propylene oxidation method, and formaldehyde can be obtained by methanol oxidation method.

2. Process

The manufacturing process of neopentyl glycol mainly includes the following steps:

1. Mix isobutyraldehyde and formaldehyde in a certain proportion, add catalyst, and carry out condensation reaction.
2. The reaction product undergoes dehydration, rectification and other steps to obtain crude neopentyl glycol.
3. The crude product of neopentyl glycol is refined to obtain neopentyl glycol product with high purity.

3. Reaction Principle

The principle of the reaction for producing neopentyl glycol is as follows:

Isobutyraldehyde Formaldehyde→Neopentyl Glycol

This reaction is a condensation reaction, I .e., neopentyl glycol and water are produced by a condensation reaction between the aldehyde group and the alcoholic hydroxyl group of isobutyraldehyde and formaldehyde.

4. equipment

neopentyl glycol manufacturing equipment mainly includes reaction kettle, dehydration tower, distillation tower, storage tank, etc. Among them, the reaction kettle needs to have heating, stirring, cooling and other functions to ensure the smooth progress of the reaction.

5. operation steps

neopentyl glycol manufacturing operation steps are as follows:

1. mix isobutyraldehyde and formaldehyde according to a certain proportion, add a catalyst, and stir evenly.
2. The mixture is heated to a certain temperature for a certain period of time to allow the reaction to proceed fully.
3. After completion of the reaction, the product was cooled to room temperature and subjected to dehydration treatment.
4. The dehydrated product is distilled to obtain crude neopentyl glycol.
5. The crude product of neopentyl glycol is refined to obtain a neopentyl glycol product with high purity.

6. control method

In order to ensure the manufacturing quality and yield of neopentyl glycol, it is necessary to take certain control methods. Specifically include:

1. Control the quality and proportion of raw materials to ensure the smooth progress of the reaction.
2. Control the reaction temperature and time to avoid the occurrence of side reactions.
3. Control the conditions of dehydration and distillation to ensure the purity and yield of the product.

7. safety production

there are certain safety risks in the manufacturing process of neopentyl glycol, and corresponding safety measures need to be taken.

1. Strictly control the quality and proportion of raw materials to avoid the occurrence of safety accidents caused by the use of unqualified raw materials.
2. Strengthen the equipment maintenance and overhaul to ensure the normal operation of the equipment and avoid the occurrence of safety accidents caused by equipment failure.
3. Strengthen the training and management of operators, improve the safety awareness and operation skills of operators, and avoid the occurrence of safety accidents caused by human factors.

In short, the manufacturing method of neopentyl glycol requires strict control of raw materials, processes, equipment, operations and other conditions to ensure product quality and production safety. At the same time, it is necessary to strengthen technological innovation and research and development to improve the manufacturing level and competitiveness of neopentyl glycol.

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