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Dehydrogenation catalyst, preparation method and application thereof, and method for preparing cyclohexanone by cyclohexanol dehydrogenation

A dehydrogenation catalyst and cyclohexanol technology are applied in the field of cyclohexanol dehydrogenation to prepare cyclohexanone, and can solve the problems of long time, low dehydrogenation temperature, unfavorable industrial application and the like

Active Publication Date: 2015-06-24
BEIJING ENERGY ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the low dehydrogenation temperature, the reaction rate is undoubtedly relatively slow, so that it takes a long time to obtain a high conversion rate, so it is not conducive to industrial applications.

Method used

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  • Dehydrogenation catalyst, preparation method and application thereof, and method for preparing cyclohexanone by cyclohexanol dehydrogenation
  • Dehydrogenation catalyst, preparation method and application thereof, and method for preparing cyclohexanone by cyclohexanol dehydrogenation
  • Dehydrogenation catalyst, preparation method and application thereof, and method for preparing cyclohexanone by cyclohexanol dehydrogenation

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preparation example Construction

[0015] The invention provides a method for preparing a dehydrogenation catalyst, the method comprising: under co-precipitation conditions, contacting the soluble salt of the dehydrogenation active component with a precipitating agent capable of precipitating the cation of the soluble salt in water and then filtering to obtain Solid precipitate, dry or not dry the solid precipitate and roast; wherein, the dehydrogenation active component contains Zn element, Ca element and Ba element, and the molar ratio of Zn element, Ca element and Ba element 3-1000:5-50:1, and the contacting is carried out in the presence of an organic compound containing a functional hydroxyl group.

[0016] According to the preparation method of the dehydrogenation catalyst of the present invention, as long as the molar ratio of Zn element, Ca element and Ba element in the dehydrogenation active component is guaranteed to be 3-1000: 5-50: 1, and the contact is carried out in the The purpose of the present ...

preparation Embodiment 1

[0035] Configuration 2L concentration is the mixed aqueous solution of barium nitrate, calcium nitrate and zinc nitrate (wherein the molar ratio of zinc element: calcium element: barium element is 5: 20: 1) that concentration is 30% by weight;

[0036] Add 6g of monoethanolamine to the aforementioned mixed aqueous solution to obtain a mixed aqueous solution containing alcoholamine;

[0037] At 70°C, the aforementioned mixed aqueous solution containing alkanolamine was contacted with an aqueous sodium carbonate solution with a concentration of 2 mol / L for 2 hours, wherein the amount of sodium carbonate was controlled so that barium ions, calcium ions and zinc ions were all precipitated, and then the precipitated The material was filtered off and washed (washing until no nitrate was detected, using FeSO 4 solution and concentrated sulfuric acid test, which is called the nitrate ring test), and then baked at 610°C for 5 hours to obtain C1.

preparation Embodiment 2-8

[0039] Prepare the dehydrogenation catalyst C2-C8 according to the method for Preparation Example 1, the difference is that in the preparation process, the temperature of active components, co-precipitation and roasting temperature etc. change to some extent (see Table 1 for details, wherein it is the same as that of Preparation Example 1 The same conditions are not listed again).

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Abstract

The invention provides a dehydrogenation catalyst, and a preparation method and application thereof. The method comprises the following steps: under coprecipitation conditions, contacting a soluble salt of a dehydrogenation active component with a cationic precipitant capable of precipitating the soluble salt in water, filtering to obtain a solid precipitate, and drying and roasting the solid precipitate or directly roasting the solid precipitate, wherein the dehydrogenation active component contains Zn, Ca and Ba in a mol ratio of (3-1000):(5-50):1, and the contacting is carried out in the presence of an organic compound containing hydroxy functional group. The invention also provides a method for preparing cyclohexanone by cyclohexanol dehydrogenation. The dehydrogenation catalyst provided by the invention has higher catalytic activity in dehydrogenation reaction, can implement catalytic dehydrogenation at higher vapor-phase temperature, can keep high selectivity for the target product, and can achieve higher conversion rate and higher selectivity for cyclohexanone at higher vapor-phase dehydrogenation temperature especially in dehydrogenation reaction of cyclohexanol for preparing cyclohexanone.

Description

technical field [0001] The present invention relates to a method for preparing a dehydrogenation catalyst, a dehydrogenation catalyst prepared by the method for preparing a dehydrogenation catalyst of the present invention and its application in a dehydrogenation reaction, and a method for preparing cyclohexanone by dehydrogenating cyclohexanol Methods. Background technique [0002] Catalytic dehydrogenation of secondary alcohols is widely used in industry to produce ketones, for example from cyclohexanol to cyclohexanone (see in particular K. Weissermel, H.-J. Arpe, Industrielle Organische Chemie, Fourth Edition, Verlag Chemie, Weinheim, 1994, p. 274). Dehydrogenation reactions such as the reaction of cyclohexanol dehydrogenation to prepare cyclohexanone are endothermic reactions (see the following formula), so dehydrogenation The reaction generally involves passing an alcohol or alcohol / ketone mixture over a copper catalyst at elevated temperatures, typically above 200°...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06C07C49/403C07C45/51
Inventor 曲良龙董维正王月金芃澔南方陈健
Owner BEIJING ENERGY ENG TECH