Preparation method of cyclohexane

The technology of cyclohexane and tower kettle is applied in the field of preparing cyclohexane, which can solve the problems such as the difficulty of catalyst replacement, and achieve the effects of stable operation and content reduction.

Active Publication Date: 2008-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, catalyst replacement for this process is difficult

Method used

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  • Preparation method of cyclohexane

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Experimental program
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Effect test

Embodiment 1

[0024] Structural parameters of the reaction distillation tower: a sieve tray tower with a diameter of Φ100mm, the number of trays is 20, the aperture of the tray is Φ3mm, and the opening ratio is 3.0%, and a homogeneous complex nickel catalyst (produced by Sinopec Baling Branch, brand name HC-402-2).

[0025] Operating conditions: The pressure of the reaction distillation tower is 1800KPa, the temperature of the tower is controlled at 180°C, the amount of benzene fed to the top of the tower is 5 kg / hour, the ratio of hydrogen to benzene is 3.1, and the concentration of the main catalyst metal nickel in the feed tray is 700-1000 mg / kg, flash tank pressure 400KPa.

[0026] Experimental results: the residual benzene content is 700mg / kg, and the hydrogen utilization rate is 94.95%.

Embodiment 2

[0028] Operating conditions: The pressure of the reaction distillation tower is 1800KPa, the temperature of the tower is controlled at 180°C, the amount of benzene fed to the top of the tower is 5 kg / hour, the ratio of hydrogen to benzene is 3.1, and the concentration of the main catalyst metal nickel in the feed tray is 1700-1900 mg / kg. Other conditions are the same as example 1.

[0029] Experimental results: The residual benzene content is 200mg / kg, and the hydrogen utilization rate is 96.99%.

Embodiment 3

[0031] Operating conditions: The pressure of the reactive distillation tower is 1200KPa, the temperature of the tower tank is controlled at 170°C, the amount of benzene at the top of the tower is 5 kg / hour, the ratio of hydrogen to benzene is 4, and the pressure of the flash tank is 300KPa. Other conditions are the same as example 1.

[0032] Experimental results: the residual benzene content is 970mg / kg, and the hydrogen utilization rate is 73.99%.

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Abstract

A method for preparing a cyclohexane comprises the following steps: a benzene and a hydrogenation catalyst are driven to enter a distillation tower from the tower top and the hydrogen goes into the distillation tower from the tower bottom; the tower bottom is heated by the steam and a reaction in which the benzene hydrogenation is used for generating the cyclohexane is conducted in the tower; the condensate at the tower top refluxes and the discharged materials from the tower bottom are subject to the flash separation so as to obtain the cyclohexane. The method of the invention can lower the content of the methyl cyclopentane in the products and is beneficial to the stabilized operation and the enhancement of the hydrogen utilization ratio and the effective reaction volume of the tower.

Description

technical field [0001] The present invention relates to a process for the preparation of cyclohexane by hydrogenation of benzene. Background technique [0002] Cyclohexane is an important organic chemical raw material. It is colorless, easy to flow, and has a pungent smell. It is mainly used for the production of cyclohexanol, cyclohexanone, nylon 6 and nylon 66. It is an excellent solvent for cellulose ether, resin, wax, grease, asphalt and rubber. It can also be used as diluent for polymerization reaction, detergent, adipic acid extraction agent and adhesive, etc. Benzene hydrogenation is currently the main method for producing cyclohexane in the world. The hydrogenation of benzene can be divided into gas phase method and liquid phase method. Commonly used catalysts are nickel, platinum, and palladium, and these catalysts can be supported on Al 2 o 3 etc. on the carrier. It can also be a homogeneous catalyst, such as the nickel-based complex catalyst developed by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/10C07C13/18
Inventor 傅送保赵福军吴明温朗友朱泽华闵恩泽俞芳王群刘良红管炳伟
Owner CHINA PETROLEUM & CHEM CORP
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