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A kind of spherical alumina carrier and its preparation method and application

A spherical alumina and carrier technology, applied in catalyst carriers, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of large pore volume and high strength, and achieve the effects of reducing wear, improving mechanical strength and reducing usage.

Active Publication Date: 2021-02-09
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the oil ammonia column forming method is that the product has a large pore volume and high strength, but the disadvantage is that there is ammonia pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 100g of macroporous pseudoboehmite with a pore volume of 0.90ml / g and a particle size of <15μm, add 300g of water, stir evenly, add 1.6g of glucomannan, stir evenly, then add 15ml of concentrated nitric acid to acidify into a sol, The average particle diameter of the sol is 45nm, and the solid content in the sol is 18%.

[0030] The sol was dropped into the oil ammonia column device, molded, and aged for 2 hours.

[0031] The gel balls were taken out and rinsed twice with deionized water, dried at 80°C for 8 hours in an atmosphere with a water vapor to air volume ratio of 75:25, and then calcined at 800°C for 6 hours to obtain the spherical alumina carrier of this example.

[0032] The height of the oil phase of the oil ammonia column device is 20cm, and the height of the water phase is 5cm; the oil phase is petroleum ether, and the water phase is an ammonia solution containing ethylene glycol and ammonium nitrate, the concentration of ethylene glycol is 5g / L, and ...

Embodiment 2

[0035] Take 100g of macroporous pseudoboehmite with a pore volume of 0.95ml / g and a particle size of <15μm, add 350g of water, stir well, add 1.9g of galactomannan, stir well, then add 18ml of concentrated nitric acid to acidify into a sol , the average particle size of the sol is 38nm, and the solid content in the sol is 15%.

[0036] The sol was dropped into the oil ammonia column device, molded, and aged for 1 hour.

[0037] The gel balls were taken out and rinsed twice with deionized water, dried at 100°C for 4 hours in an atmosphere with a water vapor to air volume ratio of 50:50, and then calcined at 600°C for 10 hours to obtain the spherical alumina carrier of this example.

[0038] The height of the oil phase of the oil ammonia column device is 18cm, and the height of the water phase is 10cm; the oil phase is mineral oil, and the water phase is ammonia solution containing diethylene glycol and ammonium nitrate, and the concentration of diethylene glycol is 3.8g / L , th...

Embodiment 3

[0041] Take 100g of macroporous pseudoboehmite with a pore volume of 1.00ml / g and a particle size of <15μm, add 380g of water, stir well, add 0.4g glucomannan and 0.8g urea, stir well, then add 10g concentrated nitric acid and 12g of formic acid to form a sol, the average particle size of the sol is 29nm, and the solid content in the sol is 13%.

[0042] The sol was dropped into the oil ammonia column device, molded, and aged for 2 hours.

[0043] The gel balls were taken out and rinsed with deionized water, dried at 90°C for 7 hours in an atmosphere with a water vapor to air volume ratio of 65:35, and then calcined at 900°C for 5 hours to obtain the spherical alumina carrier of this example.

[0044] The height of the oil phase of the oil ammonia column device is 15cm, and the height of the water phase is 15cm; the oil phase is toluene, the water phase is an ammonia solution containing glycerin and ammonium nitrate, the concentration of glycerin is 2g / L, the concentration of ...

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Abstract

The invention provides a method for preparing a spherical alumina carrier, which belongs to the technical field of catalysts. Including: 1) Pseudo-boehmite is added to water, and then acidified into a sol after adding a gelling agent; 2) The sol is dropped into an oil ammonia column device, formed and aged; 3) The aged gel ball is deionized Rinse with water, dry and calcinate to obtain a spherical alumina carrier. The invention uses pseudo-boehmite with large pore volume to form gel, and controls the particle size of the sol, so that the sol is more compact after gelling in the ammonia water phase, and the mechanical strength of the alumina carrier is improved. The gel balls are dried in the air containing water vapor, which can improve the wear resistance of the finished alumina carrier and reduce wear. By adding a suitable gelling agent and adding ammonium nitrate and alcohol to the ammonia water phase, the sol beads are quickly gelled and solidified in the ammonia water phase, reducing the height of the ammonia water layer and reducing the amount of ammonia water used.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a spherical alumina carrier and its preparation method and application. Background technique [0002] The carrier is an important part of the catalyst. An ideal catalyst carrier should meet the following conditions: 1) have a certain shape that can adapt to the reaction process, 2) have sufficient mechanical strength to withstand the mechanical and thermal shocks in the reaction process, and have Sufficient tensile strength to resist the cracking of the dirt gradually deposited in the pores during the use of the catalyst, 3) sufficient specific surface area and pore structure so that the active components can be evenly loaded on the surface, 4) It has sufficient stability to resist the erosion of active components, reactants and reaction products, and can withstand the regeneration treatment of the catalyst. 5) The thermal conductivity, specific heat and specific gravity are su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/04B01J35/08B01J37/03B01J8/08
CPCB01J32/00B01J8/08B01J21/04B01J35/08B01J37/036
Inventor 梁衡韩伟潘相米艾珍吴砚会程牧曦李博郑敏王华
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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