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

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The manufacturing method
of acetaldehyde
acetaldehyde is an important organic chemical raw material, which is widely used in medicine, plastics, rubber, textile and other fields. Therefore, it is of great significance to study the manufacturing method of acetaldehyde. This article will introduce three manufacturing methods of acetaldehyde: alcohol oxidation, ethylene oxidation and acetylene hydration.

1. alcohol oxidation

alcohol oxidation is the main method for the production of acetaldehyde, usually ethanol as raw material, under the action of catalyst, by high temperature oxidation reaction to produce acetaldehyde. The specific steps are as follows:

1. The ethanol vapor and air are mixed according to a certain proportion and enter the oxidation reactor.
2. In the reactor, ethanol vapor is oxidized to acetaldehyde and water vapor at high temperature.
3. The reaction product was cooled and separated to obtain crude acetaldehyde.
4. The crude product of acetaldehyde is refined to obtain a higher purity acetaldehyde product.

2. Ethylene Oxidation Method

Ethylene Oxidation method is a method of preparing acetaldehyde by oxidation reaction of ethylene as raw material. The specific steps are as follows:

1. Ethylene and oxygen are mixed in a certain proportion and enter the oxidation reactor.
2. In the reactor, ethylene is oxidized to acetaldehyde at high temperature.
3. The reaction product was cooled and separated to obtain crude acetaldehyde.
4. The crude product of acetaldehyde is refined to obtain a higher purity acetaldehyde product.

3. acetylene hydration

acetylene hydration is a method of acetylene and water as raw materials, under the action of a catalyst, through the hydration reaction of acetaldehyde. The specific steps are as follows:

1. mix acetylene and water in a certain proportion and enter the hydration reactor.
2. In the reactor, acetylene and water are hydrated under the action of the catalyst to produce acetaldehyde.
3. The reaction product was cooled and separated to obtain crude acetaldehyde.
4. The crude product of acetaldehyde is refined to obtain a higher purity acetaldehyde product.

the above three methods can be used to produce acetaldehyde, alcohol oxidation is the main method for the production of acetaldehyde at home and abroad, because its raw material ethanol is widely available, the price is relatively low, and the process is more mature. However, different manufacturing methods have their own advantages and disadvantages, and the appropriate manufacturing method should be selected according to the specific situation.

In general, the manufacturing method of acetaldehyde involves multiple chemical reactions and process steps, and the reaction conditions and operation process need to be strictly controlled to ensure the quality and yield of the product. At the same time, pollutants such as waste gas and waste water generated in the production process also need to be effectively treated and discharged to ensure environmentally friendly and sustainable development.

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