Load type catalyzer for synthesizing p-aminophenol, preparation method and method of application

A supported catalyst and p-aminophenol technology, applied in the preparation of amino hydroxyl compounds, organic compounds, chemical instruments and methods, etc., to achieve the effects of high mechanical strength, high strength, easy separation and recovery

Inactive Publication Date: 2005-01-12
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a supported catalyst for synthesizing p-aminophenol by catalytic hydrogenation of nitrobenzene and its preparation method and use method, which overcomes the problems caused by nitrobenzene, aqueous sulfuric acid, and surfactants. In the reaction system composed of hydrogenation catalyst and hydrogenation catalyst, the shortcomings of high activity, high strength, high stability, easy separation process and easy recovery of precious metals cannot be taken into account in order to obtain higher p-aminophenol selectivity and improve Yield and cost reduction of p-aminophenol by catalytic hydrogenation of nitrobenzene

Method used

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  • Load type catalyzer for synthesizing p-aminophenol, preparation method and method of application

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Experimental program
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Effect test

Embodiment 1

[0030] The preparation of supported catalyst, the steps are as follows:

[0031] (1) SiO will be used as a carrier 2 Put it in a muffle furnace and bake at 200-750°C for 1-6 hours, and set aside;

[0032] (2) Weigh 3g of roasted SiO 2 Carrier, use deionized water to measure the volume of impregnating solution required for equal volume impregnation is 5mL;

[0033] (3) Weigh 0.1g catalyst precursor H 2 PtCl 6 Dissolve in 5mL of water or ethanol aqueous solution with a concentration of 20% to 50% by weight to make an impregnation solution;

[0034] (4) Weigh 3g of roasted SiO 2 The carrier is impregnated with an equal volume of 5 mL of the above impregnating solution for 5 to 25 hours;

[0035] (5) Vacuum drying the impregnated catalyst at 35-120° C. for 0.5-20 hours;

[0036] (6) placing the above-mentioned dried catalyst in a muffle furnace and roasting at 200-550° C. for 1-5 hours in a nitrogen atmosphere or an air atmosphere;

[0037] (7) The above-mentioned catalyst...

Embodiment 2

[0039] Weigh the catalyst parent agent H 2 PtCl 6 0.1g and additive RuCl 3 0.1g is dissolved in water or the ethanol aqueous solution of 20%~50% concentration by weight percentage is made into impregnation solution, other is the same as embodiment 1, can make supported catalyst Pt-Ru / SiO 2 .

Embodiment 3

[0041] Weigh the catalyst parent agent H 2 PtCl 6 0.1g and additive Co(NO 3 ) 2 0.5g is dissolved in water or the ethanol aqueous solution of 20%~50% concentration by weight percentage is made into impregnation solution, other is the same as embodiment 1, can make supported catalyst Pt-Co / SiO 2 .

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Abstract

A carried catalyst for synthesizing p-aminophenol is composed of the carrier (SiO2) and the active component chosen from Pt, Pt-Ru, Pt-Co, Pt-Ba, Pt-Mg, Pt-Ca, Pt-Al, Pt-B and Pt-Mo. Its preparing process and application method are also disclosed.

Description

technical field [0001] The technical scheme of the present invention relates to a metal-containing catalyst, in particular to a supported catalyst for synthesizing p-aminophenol and its preparation method and use method. Background technique [0002] P-Aminophenol (p-Aminophenol, PAP for short) is an important chemical raw material and organic intermediate, and has a wide range of applications in many industries of medicine and dyestuffs. [0003] There are many reports on the synthesis of p-aminophenol at home and abroad, mainly including: p-nitrophenol iron powder reduction method, nitrobenzene catalytic hydrogenation method and nitrobenzene electrolytic reduction method. At present, most enterprises in my country still use the reduction method of p-nitrophenol iron powder, that is, the Berchan method. Due to many reasons such as high production cost, poor product quality and serious pollution of "three wastes", the production of this method is gradually restricted; the n...

Claims

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Application Information

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IPC IPC(8): B01J23/56B01J23/89C07C213/00C07C215/76
Inventor 王延吉张海涛赵茜王淑芳李芳赵新强郝东珍高志军张文会段敬稳
Owner HEBEI UNIV OF TECH
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