Manufacturing method of 4-hexanone
I. Introduction
4-hexanone is an important organic chemical raw material, which is widely used in the fields of medicine, pesticide, spice and plastics. Therefore, it is of great significance to study the manufacturing method of 4-hexanone to improve the production efficiency, reduce the cost and promote the industrial development. The purpose of this paper is to discuss the manufacturing method of 4-hexanone and provide reference for its industrialized production.
II. Manufacturing method
1. Butyraldehyde method
Butyraldehyde method is the main method to produce 4-hexanone, and its process includes the condensation of butyraldehyde and acetone, dehydration, hydrogenation and other steps. The specific steps are as follows:
(1) Mix butyraldehyde with acetone at a molar ratio of 1:1, add acid catalyst, and carry out the condensation reaction to produce 2-hydroxy-2-methyl-3-butanone.
(2) The condensation product was dehydrated to form 2-methyl-3-buten-2-one.
(3) The dehydrated product is subjected to a hydrogenation reaction to produce 4-hexanone.
This method is easy to obtain raw materials and has a mature process, but the production process generates a large amount of wastewater and exhaust gas, and the cost of environmental protection is high.
2. Ethylene method
Ethylene method is a method to produce 4-hexanone by carbonylation, hydrolysis, hydrogenation and other steps using ethylene as raw material. The specific steps are as follows:
(1) Mix ethylene with carbon monoxide and water vapor, add catalyst, and carry out carbonylation reaction to produce acetic acid.
(2) Mix acetic acid with water vapor, add catalyst, and carry out hydrolysis reaction to produce acetaldehyde.
(3) Acetaldehyde is mixed with hydrogen, a catalyst is added, and a hydrogenation reaction is carried out to produce ethanol.
(4) Dehydrogenation of ethanol is carried out to produce acetaldehyde.
(5) Acetaldehyde is mixed with acetone at a molar ratio of 1:1, an acidic catalyst is added, and a condensation reaction is carried out to form 2-hydroxy-2-methyl-3-butanone.
(6) The condensation product was dehydrated to form 2-methyl-3-buten-2-one.
(7) The dehydrated product is subjected to a hydrogenation reaction to produce 4-hexanone.
This method is easy to obtain raw materials, but the process route is long, requires multiple reactors and catalysts, and the equipment investment is large.
III. Optimization and improvement
Aiming at the problems of the above two methods, the following measures can be taken to optimize and improve:
1. Strengthening the treatment and recycling of wastewater and waste gas to reduce the cost of environmental protection.
2. Develop efficient catalysts to improve the 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.
IV. Conclusion
4-Hexanone is an important chemical raw material, and its manufacturing methods mainly include butyraldehyde method and ethylene method. Both methods have their advantages and disadvantages, and the suitable process route should be selected according to the actual situation. At the same time, the treatment and recycling of wastewater and waste gas should be strengthened, efficient catalysts should be researched and developed, and the process parameters and operating conditions should be optimized and other measures should be taken to improve the production efficiency, reduce the cost and promote the industrial development.
