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Catalyst for preparing cyclohexylbenzene by hydroalkylation of benzene, preparation method and application thereof

A technology for the hydrogenation of cyclohexylbenzene and benzene, which is applied in the direction of carbon compound catalysts, physical/chemical process catalysts, catalysts, etc., can solve the problems of low selectivity, high price, and low catalytic activity of cyclohexylbenzene, and achieve high selectivity , Simple operation, good effect at low temperature

Active Publication Date: 2021-01-29
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the first two methods, the benzene hydroalkylation method has the advantages of wide source of raw materials, simple process, and environmental protection in the production process. The catalyst is an expensive noble metal catalyst, and its catalytic activity is relatively low, especially the selectivity for preparing cyclohexylbenzene is low (less than 80%), so the process is far from being suitable for large-scale industrial production

Method used

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  • Catalyst for preparing cyclohexylbenzene by hydroalkylation of benzene, preparation method and application thereof
  • Catalyst for preparing cyclohexylbenzene by hydroalkylation of benzene, preparation method and application thereof
  • Catalyst for preparing cyclohexylbenzene by hydroalkylation of benzene, preparation method and application thereof

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preparation example Construction

[0029]The present invention also provides a preparation method of the catalyst described in the above technical scheme, which includes the following steps:

[0030](1) Mixing the non-precious metal salt solution, protective agent and complexing agent to obtain a mixed solution;

[0031](2) Add molecular sieve and precipitant to the mixed solution obtained in step (1), and hydrothermally react to obtain a precursor;

[0032](3) The precursor obtained in the step (2) is calcined to obtain a catalyst for the hydroalkylation of benzene to cyclohexylbenzene.

[0033]In the present invention, a non-precious metal salt solution, a protecting agent and a complexing agent are mixed to obtain a mixed solution. In the present invention, the mixing operation of the non-precious metal salt solution, protective agent and complexing agent is not particularly limited, and the technical solution for preparing a mixed solution well known to those skilled in the art may be adopted. In the present invention, the m...

Embodiment 1

[0061]1. Preparation of a catalyst for the hydroalkylation of benzene to cyclohexylbenzene

[0062](1) To 70mL NiCl with a concentration of 31.5mg / mL2Add 30ml of ethylene glycol and 10ml of ethylenediamine to the deionized aqueous solution, and stir at room temperature for 1 hour to obtain a mixed solution;

[0063](2) To the mixed solution obtained in step (1), add 10 g of Hβ molecular sieve, continue to stir at room temperature for 30 minutes, then add 2.0 g of sodium hydroxide and 6.14 g of urea, continue to stir at room temperature for 30 minutes, and then place it in a sealed hydrothermal kettle After the reaction is completed, the reaction kettle is cooled to room temperature, and the resulting product is suction filtered, washed three times with deionized water and 50% ethanol, and then dried at 100°C. 8 hours, get the precursor

[0064](3) The precursor obtained in the step (2) is calcined in a muffle furnace at 500° C. for 4 hours to obtain a catalyst for the hydroalkylation of benz...

Embodiment 2

[0070]According to the method of Example 1, a catalyst for the hydroalkylation of benzene to cyclohexylbenzene was prepared, wherein the molecular sieve was 10g HY molecular sieve, and the finally prepared catalyst was denoted as 10Ni / HY. The same method was used to apply the prepared 10Ni / HY catalyst to benzene hydrogenation to produce cyclohexylbenzene. The specific experimental results are shown in Table 1.

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Abstract

The invention provides a catalyst for preparing cyclohexylbenzene by hydroalkylation of benzene, a preparation method and application thereof, and belongs to the field of catalytic materials. The catalyst provided by the present invention for the preparation of cyclohexylbenzene by hydroalkylation of benzene, the active component is a non-noble metal M, including at least one of Fe, Co, Ni and Cu, and Hβ, HY and Hβ-HY One of the composite molecular sieves is used as a carrier, and the mass content of the non-noble metal M is 0.1%-40%. The catalyst provided by the invention uses non-noble metals as active components, has price advantages, reduces the production cost of the catalyst, has good activity at low temperature, and has high selectivity of target products. At a lower working temperature (can be as low as 130° C.), the selectivity of cyclohexylbenzene prepared by catalytic benzene hydroalkylation is as high as 97.3% by using the catalyst provided by the application, which greatly reduces the amount of cyclohexylbenzene produced by benzene hydrogenation. The production cost of base system cyclohexylbenzene is suitable for large-scale industrial production.

Description

Technical field[0001]The invention relates to the field of catalytic materials, in particular to a catalyst used for the hydroalkylation of benzene to prepare cyclohexylbenzene, and a preparation method and application thereof.Background technique[0002]Cyclohexylbenzene (CHB) is a new type of chemical intermediate. Due to its high boiling point and freezing point close to room temperature, it is widely used in lithium-ion battery electrolyte to prevent overcharge, diesel additives and synthetic thin film transistors (TFT). ) LCD screen and other fields. In addition, cyclohexylbenzene can also be used to directly oxidize to produce phenol, and at the same time by-produce high value-added cyclohexanone, which solves the problem of acetone overcapacity compared to cumene oxidation to produce phenol.[0003]At present, the methods for producing cyclohexylbenzene by benzene hydroalkylation mainly include: (1) benzene and cyclohexene alkylation method; (2) biphenyl hydrogenation method; (3)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/14B01J29/76B01J29/80C07C2/74C07C13/28
CPCB01J29/146B01J29/7615B01J29/80B01J2229/18C07C2/74C07C2529/14C07C2529/76C07C2529/80C07C13/28Y02P20/52
Inventor 陈秉辉李建军张诺伟刘慧晶
Owner XIAMEN UNIV
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