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The manufacturing method
of 4-hexanone
1. Introduction
4-hexanone is an important organic chemical raw material, widely used in medicine, pesticides, spices, plastics and other fields. Therefore, it is of great significance to study the manufacturing method of 4-hexanone for improving production efficiency, reducing costs and promoting industrial development. The purpose of this paper is to explore the manufacturing method of 4-hexanone and provide reference for its industrial production.
2. manufacturing methods
1. Butyraldehyde method
Butyraldehyde method is the main method for the production of 4-hexanone, the process includes butyraldehyde and acetone condensation, dehydration, hydrogenation and other steps. The specific steps are as follows:
(1) Mix butyraldehyde and acetone in a molar ratio of 1:1, add an acidic catalyst, and perform a condensation reaction to generate 2-hydroxy-2-methyl-3-butanone. The condensation product is dehydrated
(2) to give 2-methyl-3-buten-2-one. The dehydration product is subjected to hydrogenation reaction
(3) to produce 4-hexanone.
the method is easy to obtain raw materials and mature process, a large amount of waste water and waste gas will be produced in the production process, and the environmental protection cost is high.
2. Ethylene method
Ethylene method is a method for producing 4-hexanone through carbonylation, hydrolysis, hydrogenation and other steps. The specific steps are as follows:
(1) Ethylene is mixed with carbon monoxide and water vapor, a catalyst is added, and a carbonylation reaction is carried out to generate acetic acid.
(2) Acetic acid and water vapor are mixed, a catalyst is added, and a hydrolysis reaction is carried out to produce acetaldehyde.
(3) Acetaldehyde and hydrogen are mixed, a catalyst is added, and a hydrogenation reaction is performed to generate ethanol. Ethanol is dehydrogenated
(4) to produce acetaldehyde.
(5) Acetaldehyde and acetone are mixed in a molar ratio of 1:1, an acidic catalyst is added, and a condensation reaction is performed to generate 2-hydroxy-2-methyl-3-butanone. The condensation product is dehydrated
(6) to give 2-methyl-3-buten-2-one. The dehydration product is subjected to a hydrogenation reaction
(7) to produce 4-hexanone.
the raw materials of this method are easy to obtain, the process route is long, multiple reactors and catalysts are required, and the equipment investment is large.
3. optimization and improvement
In view of the problems of the above two methods, the following measures can be taken to optimize and improve:
1. Strengthen the treatment and recycling of waste water and waste gas to reduce environmental protection costs.
2. Develop high-efficiency catalysts to improve reaction rate and selectivity, and reduce energy consumption and raw material consumption.
3. Optimize process parameters and operating conditions to improve equipment utilization and production efficiency.
4. conclusion
4-hexanone is an important chemical raw material, and its manufacturing methods mainly include butyraldehyde method and ethylene method. The two methods have their own advantages and disadvantages, and the suitable process route should be selected according to the actual situation. At the same time, we should strengthen the treatment and recycling of waste water and waste gas, develop efficient catalysts, optimize process parameters and operating conditions and other measures to improve production efficiency, reduce costs and promote industrial development.