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Preparation method of magnetic carrier solid carried Raney-Ni catalyst and its application

A raney-ni, magnetic carrier technology, applied in Raney-type catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as fragmentation, catalyst active site wear, permanent deactivation, etc.

Inactive Publication Date: 2006-11-01
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the use of Raney-Ni catalyst, the catalytic activity decreases with the increase of the number of uses. There are three main reasons for the deactivation: (1) deactivation caused by catalyst poisons, such as materials containing sulfur, arsenic, phosphorus, Halogen, mercury, lead, silicon dioxide and other trace impurities, these substances will strongly occupy the nickel active center, causing irreversible deactivation or permanent deactivation of the catalyst; (2) deposition by reactants and macromolecular substances (dextrin and (3) During the hydrogenation process, due to mechanical stirring and the strong impact of the three phases of liquid, solid, and gas, the catalyst particles are broken, and the catalyst particles are broken. The structure is destroyed, and the active sites of the catalyst are worn away, resulting in a decrease in catalyst activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take the residual magnetic flux as 150mT, the coercive force as 50kA / m, the intrinsic coercive force as 180kA / m, and the maximum magnetic energy area as 4kJ / m 3 100g of the magnetic carrier, mechanically crushed to a particle size of 3×2×2mm, put into 200g of the prepared Raney-Ni catalyst, fully adsorbed, and the immobilized Raney-Ni catalyst of 0.625g catalyst / g magnetic material can be obtained .

Embodiment 2

[0015] Take the residual magnetic flux as 250mT, the coercive force as 78kA / m, the intrinsic coercive force as 212kA / m, and the maximum magnetic energy area as 5.7kJ / m 3 100g of the magnetic carrier, mechanically crushed to a particle size of 3×2×2mm, put into 200g of the prepared Raney-Ni catalyst, fully adsorbed, and the immobilized Raney-Ni catalyst of 0.815g catalyst / g magnetic material can be obtained .

Embodiment 3

[0017] The residual magnetic flux is 450mT, the coercive force is 94kA / m, the intrinsic coercive force is 242kA / m, and the maximum magnetic energy area is 11.8kJ / m 3 150g of the magnetic carrier, mechanically crushed to a particle size of 1×2×1mm, put into the prepared Raney-Ni catalyst 300g, fully adsorbed, and the immobilized Raney-Ni catalyst of 1.335g catalyst / g magnetic material can be obtained .

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Abstract

The invention relates to a preparation method of a Raney-Ni catalyst immobilized on a magnetic carrier, which is applied in the hydrogenation reaction of unsaturated hydantoin. After being immobilized, the loss and deactivation of the catalyst are better resolved, which greatly reduces the amount of catalyst used.

Description

technical field [0001] The invention relates to a preparation method of a Raney-Ni catalyst immobilized on a magnetic carrier, that is, selecting a magnetic carrier with certain magnetic parameters, mechanically pulverizing it, putting it into the prepared Raney-Ni catalyst, and fully absorbing it, so that Raney-Ni immobilized can be obtained. Catalyst, and used in the hydrogenation of benzylidene hydantoin, p-hydroxybenzylidene hydantoin and indole methylene hydantoin. Background technique [0002] Raney-Ni catalyst is a metal nickel catalyst with a sponge-like pore structure. Since its invention in 1925, it has developed into a class of widely used catalysts. Raney-Ni can be used not only for the catalytic hydrogenation of unsaturated alkenes, alkynes, aromatics, nitro, cyano, carbonyl, etc., but also for the hydrogenolysis, isomerization, and cyclization of saturated hydrocarbons. Raney-Ni catalyst is prepared by reacting pulverized nickel-aluminum alloy with sodium hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J25/02
Inventor 韦萍曹飞周华欧阳平凯
Owner NANJING TECH UNIV