Traditional Cyclohexanone Production Process The traditional cyclohexanone production processes in the world mainly include phenol hydrogenation, benzene plus hydrogenation, and cyclohexane liquid phase oxidation. The raw materials for cyclohexanone production are benzene and hydrogen.
1. Phenol Hydrogenation Process
The phenol synthesis cyclohexanone process was the earliest process used to industrially produce cyclohexanone.The process is divided into two steps: The first step is the hydrogenation of phenol to cyclohexanol, the second step is the dehydrogenation of cyclohexanol to cyclohexanone: In the 1970s, a new one-step hydrogenation process for the synthesis of cyclohexanone was successfully developed. Process. Phenol is hydrogenated in one step in both gas phase and liquid phase. The gas phase method is mainly used in industry. This process uses 3--5 reactors in series, with a temperature of 140--170°C and a pressure of 0.1 MPa, and a yield of 95%. Cyclohexanone produced by the phenol hydrogenation method is of good quality and high safety. However, due to the high price of phenol and the use of noble metal catalysts, the production cost of cyclohexanone is high, so the application of this process is greatly restricted. .
2. Benzene-Hydrogenation Process
Benzene-hydrogenation process The hydrogenation of benzene and hydrogen in the presence of a nickel catalyst at 120-180°C produces cyclohexane, which is in the air.
The oxidation reaction occurs at 150--160°C and 0.908Mpa to form a mixture of cyclohexanol and cyclohexanone: cyclohexanone is obtained after the mixture is separated, and cyclohexanol is dehydrogenated into cyclohexanone in the presence of zinc and calcium catalysts:
3. Liquid Phase Oxidation of Cyclohexane
At present, over 90% of cyclohexanone is produced by cyclohexane oxidation. There are two oxidation process routes for the cyclohexane liquid phase oxidation in industrial production, one is a catalytic oxidation process, and the other is a non-catalytic oxidation process. ......
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