| abstract |
The invention relates to a preparation method of cyclohexanone oxime, which mainly comprises the following steps: (1) oxidizing cyclohexane and molecular oxygen under the action of a solid catalyst, generating KA oil by one-step reaction, and separating the KA oil; (2) ) Amination of KA oil directly with ammonia and hydrogen under the action of a solid catalyst produces cyclohexylamine and a small amount of by-product-A, and cyclohexylamine is separated; (3) cyclohexylamine and molecular oxygen are mixed in the solid catalyst Partial oxidation is carried out under the action to obtain an oxidation product mainly composed of cyclohexanone oxime, a small amount of by-product-B and possibly incompletely converted cyclohexylamine; (4) amination of the oxidation product: the oxidation product obtained in step (3) is obtained Without separation, the amination reaction is carried out directly with ammonia and hydrogen under the action of a solid catalyst, and the by-product-B is converted into cyclohexylamine, and then separated to obtain cyclohexanone oxime. The invention has the advantages of short technological process, less land occupation and investment, low cost and environment friendly. |