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Catalyst system for preparing cyclohexene by benzene selective hydrogenation, and method for preparing cyclohexene by benzene selective hydrogenation by catalyzing with catalyst system

A technology for selective hydrogenation and catalytic system, applied in the chemical industry, can solve the problems of low selectivity and yield of cyclohexene, unsatisfactory application effect, general yield comprehensive effect, etc., and achieve the effect of high selectivity and yield

Active Publication Date: 2012-10-24
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current problem is that the selectivity and yield of cyclohexene are generally low. So far, only Asahi Kasei of Japan has realized industrialization in the world. The main technical indicators are that when benzene is converted to 40%, the selectivity of cyclohexene is about 80%. The yield is about 32%, and domestic and foreign patents focus on the catalyst itself. Although the catalytic activity of the prepared catalyst is very high, the actual application effect is not ideal. When benzene is converted to 40%, the cyclohexene selectivity and cyclohexene yield The overall effect of the rate is general

Method used

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  • Catalyst system for preparing cyclohexene by benzene selective hydrogenation, and method for preparing cyclohexene by benzene selective hydrogenation by catalyzing with catalyst system

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Nano metal Ru catalyst preparation:

[0030] Prepared by co-current precipitation method. At 70 °C, RuCl 3 The solution is one side, the concentration is 0.4 M, and the volume is 400 ml; the NaOH and polyethylene glycol solution is the other side, the concentration is 2 M, which contains 1.6 g polyethylene glycol-10000. Controlling the same flow rate, the two solutions are mixed and then enter into a stirred reactor, where the reaction takes place under sufficient stirring. After the reaction was complete, the mixture was stirred for 30 min and cooled to room temperature. The reaction mixture was transferred to a 1 L Teflon-lined autoclave. At a stirring rate of 800-1200 r / min, at 150°C, 5 MPa H 2 Press down and restore for 3 h. Cool to room temperature, introduce the liquid in the kettle into the settling tank, and remove the supernatant. The obtained black solid Ru catalyst was washed with distilled water until neutral, and dried in vacuum. Utilize TEM to measu...

Embodiment 2

[0033] Take 2 g of the nano-Ru catalyst in Example 1, add 0.32 g of NaOH, and other conditions are the same as in Example 1. The catalyst evaluation results are listed in Table 1.

Embodiment 3

[0035] Take 2 g of the nano-Ru catalyst in Example 1, add 5.70 g of NaOH, and other conditions are the same as in Example 1. The catalyst evaluation results are listed in Table 1.

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Abstract

The invention relates to a catalyst system for preparing cyclohexene by benzene selective hydrogenation, and a method for preparing cyclohexene by benzene selective hydrogenation. The method for preparing cyclohexene by benzene selective hydrogenation is implemented by catalyzing with the catalyst system composed of nanometer Ru catalyst, alkaline substance M, zinc salt and water. The nanometer Ru catalyst with microcrystalline size of 3-6 nm is prepared from NaOH, RuCl3 and polyethylene glycol (PEG) by co-current co-precipitation method. The alkaline substance M can be hydroxide, oxide or alkaline organic substance of alkali metal, alkaline earth metal, transition metal or rare earth metal. The zinc salt can be zinc sulfate, zinc nitrate or zinc chloride. Ru catalyst / M / zinc salt weight ratio is 1:(0-10):(20-30), and Ru / water weight ratio is 0.5-1%. At 150 DEG C and 5.0 MPa, after reaction for 15-25 min, when the benzene conversion rate is 40-60%, cyclohexene selectivity is 75-85%, and cyclohexene yield is 35-50%.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a catalytic system for preparing cyclohexene through selective hydrogenation of benzene and a method for preparing cyclohexene through selective hydrogenation of benzene. Background technique [0002] Benzene selective hydrogenation catalytic technology uses benzene as raw material to produce cyclohexene through selective hydrogenation under the action of catalyst. Cyclohexene has a lively double bond, which can be hydrated to prepare cyclohexanol, oxidized to prepare adipic acid, and then to prepare cyclohexanone, caprolactam, polyester and polyamide and other industrially widely used chemical products. The downstream products of cyclohexene involve many fields such as construction, decoration, automobile, high-speed rail, civil and national defense industries, and play an important role in the development of the national economy. The traditional route is to use the com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J31/26C07C13/20C07C5/11
CPCY02P20/52
Inventor 李晓霞郑强勇苗俊伟代建军李杰
Owner ZHENGZHOU UNIV
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