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Method for preparing cyclohexanol by hydrating cyclohexene

A technology of cyclohexene hydration and cyclohexanol, which is applied in the preparation of hydroxyl addition, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of fast deactivation, slow reaction rate of catalysts, and low conversion rate, so as to improve conversion High efficiency, diverse preparation methods, and easy-to-obtain raw materials

Active Publication Date: 2020-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

[0004] According to one aspect of the present application, a method for preparing cyclohexanol by hydration of cyclohexene is provided, which can solve the shortcomings of slow reaction rate, low conversion rate and fast deactivation of catalysts in the existing industry

Method used

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  • Method for preparing cyclohexanol by hydrating cyclohexene
  • Method for preparing cyclohexanol by hydrating cyclohexene
  • Method for preparing cyclohexanol by hydrating cyclohexene

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Experimental program
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Embodiment 1

[0045] The preparation of embodiment 1 catalyst

[0046] A ZSM-5 molecular sieve with a silicon-aluminum ratio (Si / Al) of 14.3 was taken, and the molecular sieve was subjected to water vapor treatment at 600°C for 3 hours. Add 100 g of the obtained molecular sieve into 3 L of 0.2 mol / L NaOH solution, stir magnetically at 80 °C for 30 min, then filter and wash until neutral, and dry in an oven at 120 °C for 12 h. The obtained molecular sieve was subjected to ammonium ion exchange to the hydrogen form (exchanged three times with 0.5 mol / L ammonium nitrate aqueous solution, washed with deionized water, dried, and then calcined at 550° C. for 4 hours) to obtain the hydrogen form multi-level porous ZSM-5 molecular sieve , denoted as catalyst A, and its scanning electron microscope image is shown as figure 1 shown.

Embodiment 2

[0047] The preparation of embodiment 2 catalyst

[0048] Taking ZSM-5 molecular sieve with a silicon-aluminum ratio (Si / Al) of 28.4, the same method as in Example 1 was used to obtain a hydrogen-type hierarchical porous ZSM-5 molecular sieve, which was designated as catalyst B.

Embodiment 3

[0049] The preparation of embodiment 3 catalyst

[0050] Take ZSM-5 molecular sieve with a silicon-aluminum ratio (Si / Al) of 50.3, and use the same method as in Example 1 to obtain a hydrogen-type hierarchical porous ZSM-5 molecular sieve, which is designated as catalyst C.

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Abstract

The invention discloses a method for preparing cyclohexanol by hydrating cyclohexene, and belongs to the field of catalyst materials. The method for preparing the cyclohexanol by hydrating the cyclohexene at least comprises the following steps: enabling a raw material containing cyclohexene and water to be in contact reaction with a catalyst to obtain cyclohexanol, wherein the catalyst comprises ahierarchical pore ZSM-5 molecular sieve. According to the method, the catalyst containing the hierarchical pore ZSM-5 molecular sieve is applied to a reaction for preparing cyclohexanol by hydratingcyclohexene, so that the conversion rate of the reaction and the stability of the catalyst can be remarkably improved; and the hierarchical pore ZSM-5 molecular sieve used in the method is readily available in raw materials and diverse in preparation method, and has strong feasibility and practicability.

Description

technical field [0001] The application relates to a method for preparing cyclohexanol by hydrating cyclohexene, which belongs to the field of catalyst materials. Background technique [0002] Cyclohexanol is an important chemical intermediate, mainly used in the production of nylon monomers such as caprolactam and adipic acid, as well as in pharmaceuticals, coatings and other industries. The production methods of cyclohexanol mainly include the hydrogenation of phenol to cyclohexanol, the oxidation of cyclohexane to cyclohexanol and cyclohexanone, and the hydration of cyclohexene to cyclohexanol. Among them, the hydration method of cyclohexene to cyclohexanol has the advantages of high selectivity, less hydrogen consumption, and mild reaction conditions. Compared with other methods, it has obvious advantages and is the main development direction of cyclohexanol production at present. [0003] The hydration of cyclohexene to prepare cyclohexanol usually uses an acidic cataly...

Claims

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Application Information

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IPC IPC(8): C07C35/08C07C29/04B01J29/40B01J35/10
CPCC07C29/04B01J29/40C07C2601/14B01J35/633B01J35/647B01J35/615C07C35/08
Inventor 张大治黄声骏焦雨桐
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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