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Method for efficiently synthesizing DBE through supported bimetallic catalyst

A bimetallic catalyst, catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, preparation of organic compounds, etc., can solve the problem of reducing catalyst activity, etc. Small diameter, tightly combined effect

Inactive Publication Date: 2018-12-21
浙江辰阳化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the additive-modified catalyst prepared by common methods can improve the selectivity of the target product, it often reduces the activity of the catalyst
[0004] On the premise of ensuring the high selectivity of the target product, it is very meaningful and a great challenge to further improve the activity of the catalyst.

Method used

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  • Method for efficiently synthesizing DBE through supported bimetallic catalyst
  • Method for efficiently synthesizing DBE through supported bimetallic catalyst
  • Method for efficiently synthesizing DBE through supported bimetallic catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take by weighing 10g gac, particle size is 800 orders, specific surface area is 1400m2 / g, pore volume is 0.6ml / g, configuration 6ml contains H2PdCl4 and ZnCl2 mixed solution (the quality that contains Pd in ​​the mixed solution is 0.2g, the quality that contains Zn was 0.3g); the mixed solution was added dropwise to activated carbon, and stirred evenly. The impregnated catalyst was vacuum dried at 25°C for 10 h. The dried catalyst was reduced under H2 atmosphere at 60° C. for 6 h to obtain palladium-zinc catalyst supported on activated carbon.

Embodiment 2

[0029] Take by weighing 10g gac, particle size is 500 orders, specific surface area is 1200m2 / g, pore volume is 0.5ml / g, configuration 5ml contains H2PtCl6 and ZnCl2 mixed solution (the quality that contains Pt in the mixed solution is 0.2g, the quality that contains Zn was 0.4g); the mixed solution was added dropwise to activated carbon, and stirred evenly. The impregnated catalyst was vacuum dried at 20°C for 20 h. The dried catalyst was reduced under H2 atmosphere at 100° C. for 3 h to obtain a platinum-zinc catalyst supported on activated carbon.

Embodiment 3

[0031] Take by weighing 10g gac, particle size is 150 orders, specific surface area is 800m2 / g, pore volume is 0.8ml / g, configuration 8ml contains Pt(NO3) 2 and Zn(NO3) 2 mixed solution (the quality of Pt in the mixed solution is 0.4g, and the mass containing Zn is 0.2g); add the mixed solution dropwise to the activated carbon, and stir evenly. The impregnated catalyst was vacuum-dried at 30 °C for 4 h. The dried catalyst was reduced at 50° C. for 10 h under H2 atmosphere to obtain a platinum-zinc catalyst supported on activated carbon.

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Abstract

The invention discloses a method for efficiently synthesizing DBE through a supported bimetallic catalyst. The method comprises the following step: ensuring that N,N-dibenzylidene quadrol is subjectedto liquid phase catalysis hydrogenation reaction under the action of an active carbon supported bimetallic catalyst in a reaction kettle, so as to form the DBE. The method can further enhance the activity of the catalyst on the basis of guaranteeing the high selectivity of a target product, and has the advantages of high reaction speed and high selectivity of the target product.

Description

technical field [0001] The invention relates to a method for efficiently synthesizing DBE with a loaded bimetallic catalyst. Background technique [0002] DBE is a pharmaceutical intermediate, mainly used in the production of long-acting penicillin G, long-acting penicillin V, long-acting ampicillin, long-acting cephalosporins and other drugs. At present, DBE is mainly prepared industrially from N,N-dibenzylideneethylenediamine through catalytic hydrogenation. Among them, hydrogenation catalyst is the key technology of this process. [0003] Industrially, the catalysts used in the hydrogenation of N,N-dibenzylideneethylenediamine to prepare DBE are mainly Pd / C and Pt / C. However, common Pd / C or Pt / C catalysts have the problem of difficult balance between activity and selectivity. This is mainly because if the activity of the Pd / C or Pt / C catalyst is too low, the polymerization reaction will easily occur and generate by-products such as polybenzylethylenediamine; if the act...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J37/02B01J37/18C07C209/70C07C211/27
CPCB01J23/80B01J37/0201B01J37/18C07C209/70C07C211/27
Inventor 李小年张群峰陈燕舞赵根富彭艳婷
Owner 浙江辰阳化工有限公司
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