A method for hydrogenation of benzene to prepare cyclohexane in a magnetically stabilized bed

A magnetically stabilized bed and benzene hydrogenation technology, which is applied in the fields of hydrogenation to hydrocarbons, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of reduced reaction active area, carbon deposition in catalysts, and loss of catalysis Function and other issues, to achieve the effect of improving service life, reducing loss, and high selectivity

Active Publication Date: 2013-08-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogenation of benzene to cyclohexane is a highly exothermic reaction process. If the heat is not dissipated in time, it is easy to cause local "overheating" of the catalyst to generate carbon deposits, reduce the active area of ​​the reaction, and even lose the catalytic effect. This problem has become a problem that restricts benzene Bottleneck problem in the development of hydrogenation to cyclohexane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) The coercive force of the magnetic catalyst carrier is 50A / m, and the specific saturation magnetization is 40Am 2 / kg, the magnetic core is Fe 3 o 4 , with a size of 3 μm and a cladding layer of γ-Al 2 o 3 , the thickness of the cladding layer is 10 μm, the mass fraction of the magnetic core is 20%, and 0.1mol / L Ni(NO 3 ) 2 Aqueous solution, and add additive ZnCl 2 Aqueous solution, the molar ratio of Ni and metal ions in the additive is 6:1, the magnetic catalyst carrier is immersed in the above mixed solution for 3 hours, and then 0.6mol / L NaBH is added dropwise 4 Aqueous solution, control NaBH 4 The molar ratio of the mixed solution to the metal cation is 10:1 to ensure that the metal cation is completely reduced, so that the loading amount of Ni is 10wt%, and then the magnetic catalyst is washed with deionized water to neutrality, then washed three times with absolute ethanol, and finally Preserve catalyst samples in absolute ethanol to prevent oxidation; ...

Embodiment 2

[0023] 1) The coercive force of the magnetic catalyst carrier is 50A / m, and the specific saturation magnetization is 15Am 2 / kg, the magnetic core is γ-Fe 2 o 3 , the magnetic core size is 5 μm, and the cladding layer is γ-Al 2 o 3 , the thickness of the cladding layer is 50 μm, the mass fraction of the magnetic core is 10%, and 0.5mol / L Ni(NO 3 ) 2 aqueous solution, and add additive AgNO 3Aqueous solution, the molar ratio of Ni and metal ions in the additive is 10:1, the magnetic catalyst carrier is immersed in the above mixed solution for 3 hours, and then 0.2mol / L NaBH is added dropwise 4 Aqueous solution, control NaBH 4 The molar ratio of the mixed solution to the metal cation is 10:1 to ensure that the metal cation is completely reduced, so that the loading of Ni is 15wt%, and then the magnetic catalyst is washed with deionized water to neutrality, then washed three times with absolute ethanol, and finally Preserve catalyst samples in absolute ethanol to prevent ox...

Embodiment 3

[0027] 1) The coercive force of the magnetic catalyst carrier is 10kA / m, and the specific saturation magnetization is 12Am 2 / kg, the magnetic core is Fe 3 o 4 , the magnetic core size is 5 μm, and the cladding layer is γ-Al 2 o 3 , the thickness of the cladding layer is 40 μm, the mass fraction of the magnetic core is 30%, and 0.1mol / L Ni(NO 3 ) 2 aqueous solution, and add additive Co(NO 3 ) 2 Aqueous solution, the molar ratio of Ni and metal ions in the additive is 5:1, the magnetic catalyst carrier is immersed in the above mixed solution for 3 hours, and then 0.6mol / L NaBH is added dropwise 4 Aqueous solution, control NaBH 4 The molar ratio of the mixed solution to the metal cation is 10:1 to ensure that the metal cation is completely reduced, so that the loading of Ni is 7wt%, and then the magnetic catalyst is washed with deionized water to neutrality, then washed three times with absolute ethanol, and finally Preserve catalyst samples in absolute ethanol to preven...

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Abstract

The present invention discloses a method for hydrogenation of benzene to prepare cyclohexane in a magnetically stabilized bed. The method comprises steps of: first loading sodium borohydride reduced Ni2 + and metal cation additive on a magnetic catalyst, and then loading the magnetic catalyst into the reaction unit of the magnetically stabilized bed, and controlling reaction conditions of a ratio of hydrogen to benzene, a space velocity, and a magnetic field strength to enable a bed layer to form a magnetically stabilized state for hydrogenation of benzene to prepare cyclohexane. By using the magnetically stabilized bed to control the bed layer fluidization state for hydrogenation of benzene to prepare cyclohexane, the method of the present invention prevents local hot spots from emerging in the bed layer, reduces catalyst deactivation, maintains a relatively high benzene conversion rate and cyclohexane selectivity, and substantially increases the service life of the catalyst; and the magnetic field can be used to separate and recover the catalyst, thus reduce production costs.

Description

technical field [0001] The invention relates to a method for preparing cyclohexane by hydrogenating benzene in a magnetically stable bed. Background technique [0002] The magnetically stable bed is different from the traditional fluidized bed, but it uses magnetic particles as the solid phase and is magnetically fluidized under the action of an external magnetic field. The solid particles in the bed do not move freely in disorder during the operation, but in an orderly arrangement. The magnetically stabilized bed can operate stably in a wide range, and can break the bubbles to improve the mass transfer between phases. Compared with the fluidized bed, the magnetically stabilized bed can effectively control the phenomenon of interphase back mixing and particle loss by applying an external magnetic field; compared with the fixed bed, the magnetically stabilized bed can use small particle catalysts without causing excessive pressure drop and uniform voids The degree can make ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C13/18C07C5/10B01J23/755B01J23/80
CPCY02P20/52
Inventor 于濂清王清清董开拓郭亮亮韩雪
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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