Device for producing cyclohexane by adding hydrogen in benzene and synthesis process

Abstract

The invention discloses a device for producing cyclohexane by adding hydrogen in benzene and a synthesis process. The device mainly comprises a gasification tower (1) and a reactor (2), wherein a liquid phase benzene inlet (5) is arranged at the upper part of the gasification tower (1), a liquid phase benzene outlet is arranged at the lower part of the gasification tower (1), the liquid phase benzene outlet is connected with a shell pass inlet of the reactor (2) through a pipeline (8), a shell pass outlet of the reactor (2) is connected to the gasification tower (1) through a pipeline (9), a gas phase outlet is arranged at the top of the gasification tower (1) and connected to a pipe pass of the reactor (2) through a pipe pass feed pipeline (12), a hydrogen material pipeline (6) is connected to the pipe pass feed pipeline (12), and a pipe pass discharge pipeline (11) is arranged at the bottom of the reactor (2). In the device, heat discharged from the intermediate reaction in the cyclohexane synthesis process is directly used for gasification of reaction material benzene so as to release the reaction heat without secondary heat exchange, therefore, the stable reaction conversion ratio is achieved, and the production capacity is improved.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a device and a synthesis process for producing cyclohexane by hydrogenation of benzene. Background technique [0002] Cyclohexane is an important organic chemical and the main raw material for the production of nylon products. At the same time, cyclohexane is an excellent solvent for cellulose ethers, resins, waxes, asphalt and rubber, so the production of cyclohexane is becoming increasingly important. Industrially, cyclohexane production methods are divided into benzene hydrogenation method and fractional distillation and refining method of petroleum hydrocarbon fractions, and benzene hydrogenation method is divided into liquid phase method and gas phase method. figure 1 It is a schematic flow chart of the production of cyclohexane by hydrogenation of benzene in the prior art. The process flow is that liquid benzene is heated and vaporized in the vaporizer and mixed with hydro...

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Problems solved by technology

Although this method solves the problem of reaction heat removal better, but due to the existence of non-condensable gas in the reaction, the operation stability of the reactive distillation column is poor.

[0004] Chinese patent CN1156418 proposes the use of reactive distillation external coupling device to hydrogenate cyclohexane under normal pressure. This patent solves the problem of poor operability of the reactive distillation column to a certain extent, but this device requires a single-pass conversion rate of benzene hydrogenation Controlled at 30-50%, resulting in a relatively large degree of back-mixing in the reactor and a relatively low reaction space velocity, so the production capacity will decrease, which limits the large-scale production of cyclohexane. At the same time, this device also has a rectification device. The azeotrope of cyclohexane and benzene is extracted from the top of the distillation tower, and the product of cyclohexane is extracted from the bottom of the tower. As we all know, the boiling points of cyclohexane, benzene, and the azeotrope of the two are not much different, so the rectification unit operates The continuous stability of the

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