Raney nickel catalyst for hydrogenation of aromatic nitro compound in fixed bed and application of Raney nickel catalyst

A technology of aromatic nitro and Raney nickel, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, Raney catalyst, amino compound preparation, etc. It can solve the problem of easy pulverization and loss, and the mechanical strength of Raney nickel catalyst Low, poor wear resistance and other issues

Inactive Publication Date: 2021-06-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the purpose of the present invention is to provide a process for the low mechanical strength, poor wear resistance, easy pulverization and loss of the existing Raney nickel catalyst, which is not suitable for the application of large-tonnage continuous catalytic hydrogenation Granular Raney nickel catalyst for hydrogenation of aromatic nitro compounds with simple operation and good catalytic hydrogenation effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 40kg of nickel ingots, 40kg of aluminum ingots, and 1kg of zirconium ingots and place them in a medium-frequency induction melting furnace. Close the melting furnace, turn on the current, and heat-preserve and melt at 2000°C for 30 minutes. Pour the refined alloy water into a cast steel graphite plate. Do casting. Break the cooled alloy ingot, and sieve 3-7 purpose precursor alloys; accurately weigh 30g of metal alloy particles, place them in a reaction tube with an inner diameter of 8mm, and use 3wt% NaOH alkali solution at a rate of 6L / h from The bottom of the reaction tube is fed, passes through the bed of metal alloy particles and exits from the top. The bed temperature is 70°C and the activation time is 3h. After lye activation treatment, wash with deionized water at 60° C. until the pH of the solution after washing is 7-9.

[0024] Pack the activated catalyst into a fixed-bed reactor in which p-chloronitrobenzyl alcohol solution is housed, and the reaction...

Embodiment 2

[0026] Weigh 38kg of nickel ingot, 42kg of aluminum ingot, and 1kg of chromium in an intermediate frequency induction melting furnace, seal the melting furnace, turn on the current, heat and melt at 1500°C for 30 minutes, pour the refined alloy water into a cast steel graphite plate, and carry out mold. Break the cooled alloy ingot, and sieve the nickel-aluminum precursor alloy of 3-7 meshes; accurately weigh 30g of metal alloy particles, place them in a reaction tube with an inner diameter of 8mm, and use 2.5wt% NaOH alkali solution at 6L / h The speed is passed from the bottom of the reaction tube, passes through the bed of metal alloy particles and then flows out from the top. The bed temperature is 80°C and the activation time is 4h. After lye activation treatment, wash with deionized water at 60° C. until the pH of the solution after washing is 7-9.

[0027] Pack the activated catalyst into a fixed-bed reactor equipped with o-chloronitrobenzene tetrahydrofuran solution, a...

Embodiment 3

[0029] Weigh 38kg of nickel ingots, 42kg of aluminum ingots, and 1kg of tungsten into an intermediate-frequency induction melting furnace, seal the melting furnace, turn on the current, heat and melt at 2000°C for 30 minutes, pour the refined alloy water into a cast steel graphite tray, and carry out mold. Break the cooled alloy ingot, and sieve the nickel-aluminum precursor alloy of 3-7 meshes; accurately weigh 30g of the metal alloy particles, place them in a reaction tube with an inner diameter of 8mm, and use 2wt% NaOH lye at a concentration of 6L / h Velocity feeds in from the bottom of the reaction tube, passes through the bed of metal alloy particles and exits the top. The bed temperature is 90°C and the activation time is 2h. After lye activation treatment, wash with deionized water at 80° C. until the pH of the solution after washing is 7-9.

[0030] Pack the activated catalyst into a fixed-bed reactor equipped with a p-nitrobenzamide solution. The reaction pressure i...

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Abstract

The invention discloses a raney nickel catalyst for hydrogenation of an aromatic nitro compound in a fixed bed and application of the raney nickel catalyst. The catalyst comprises, by mass, 85-98% of nickel, 2-15% of aluminum and not higher than 5% of transition metal, and the particle size of the granular raney nickel catalyst is 1-10 mm. Metal precursor alloy particles are prepared; and alkali liquor is used for activating the metal alloy particles. The invention discloses a reaction process for preparing arylamine by hydrogenation of a fixed bed aromatic nitro compound.

Description

technical field [0001] The invention discloses a Raney nickel catalyst used for hydrogenation of fixed-bed aromatic nitro compounds and its application, including the preparation of metal precursor alloy particles; the activation treatment of metal alloy particles by using lye; fixed-bed aromatic nitro compounds A reaction process for the preparation of aromatic amines by hydrogenation. Background technique [0002] The catalytic hydrogenation of aromatic nitro compounds is one of the most important unit reactions in the field of fine chemicals. In practical applications, it can replace the traditional heavy pollution of iron powder and alkali sulfide reduction, realize industrial upgrading, and promote the sustainable development of the industry. However, at present, catalytic hydrogenation in the field of fine chemical industry is mostly a batch reaction process. The bottom material and catalyst are added in batches and need to be separated after the reaction is terminated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J25/02B01J23/755C07C209/36C07C211/52C07C237/30C07C231/12C07C315/04C07C317/36C07C309/47C07C303/22
CPCB01J25/02B01J23/755C07C209/36C07C231/12C07C315/04C07C303/22
Inventor 吴国君荣泽明马大庆刘东妮王璐张华王越
Owner DALIAN UNIV OF TECH
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