Method for producing cyclohexanone oxime

Abstract

The invention discloses a method for producing cyclohexanone oxime. The method comprises the following steps: aniline and hydrogen are subjected to a hydrogenation reaction, such that a hydrogenation product and hydrogenation tail gas are obtained; the hydrogenation product is subjected to distillation separation, such that cyclohexylamine, a byproduct 1, a light component 1 and a heavy component 1 are obtained through separation; cyclohexylamine is subjected to a partial oxidation reaction under the effect of an oxidant, such that a partial oxidation product is obtained; the partial oxidation product is separated, such that cyclohexanone oxime and a byproduct 2 are obtained; the byproduct 1 and / or the byproduct 2 is subjected to an amination reaction with ammonia gas and the hydrogenation tail gas or supplementary hydrogen; and an obtained amination product and the hydrogenation product are subjected to distillation separation. With the method, cyclohexanone oxime can be highly selectively produced with simple device and through simple operation. According to the invention, inexpensive aniline is adopted as a raw material; the selectivity is high; hard-to-prepare reagent is not needed; most of produced byproducts are utilized; and the production of adverse byproduct is avoided. The method is beneficial in economy.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a method for producing cyclohexanone oxime. Background technique [0002] Conventionally, various methods for producing cyclohexanone oxime are known. Among these methods, the most widely practiced on an industrial scale is the method comprising the steps of producing cyclohexanone by a multi-step process using benzene as a starting material, and combining the produced cyclohexanone with hydroxyl Amine salt reaction to obtain cyclohexanone oxime. More specifically, the most widely implemented approach involves the following three steps: [0003] (1) take benzene as starting material to produce cyclohexanone. [0004] (II) Provides hydroxylamine salts produced separately from ammonia. [0005] (III) reacting cyclohexanone with hydroxylamine salt to obtain cyclohexanone oxime. [0006] There are problems in the prior art, such as the production of by-pro...

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Problems solved by technology

[0009] Yet the cyclohexanol raw material market price in the method for this production cyclohexanone oxime is higher, and cyclohexanone market price is higher than cyclohexanol, cyclohexanol molecular weight 100, cyclohexanone molecular weight 98, cyclohexylamine molecular weight 99 , from the perspective of the amination reaction mechanism, the amination of cyclohexanol to cyclohexylamine reduces the mass, and the amination of cyclohexanone to cyclohexylamine slightly increases the mass. This method has certain limitations in economy

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