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Preparation method of refined granular molybdenum trioxide

A technology of molybdenum trioxide and refined particles, which is applied in the preparation of hydrocarbon ammoxidation, chemical instruments and methods, molybdenum oxide/molybdenum hydroxide, etc. It can solve the problems of frequent processes, low particle bonding strength, and small specific surface area of ​​particles. Achieve the effects of ensuring purity, improving reduction efficiency, and stabilizing chemical properties

Active Publication Date: 2020-12-22
JIANGSU DONGTAI FENGFENG TUNGSTEN & MOLYBDENUM MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the molybdenum trioxide powder itself is in the form of a layered structure, the internal bonding force of the particles formed by adding a binder is small. The molybdenum trioxide produced in this way has a low particle bonding strength. After being added to the reactor, the Under the impact of airflow, the particles wear quickly after collision, and are easy to disperse and become finer, and are taken away by the airflow; during the production process of acrylonitrile, the process of adding molybdenum trioxide particles to the reactor is frequent, and the production cost also increases at the same time
Furthermore, the molybdenum trioxide particles bonded by powdery molybdenum trioxide and binder have a small specific surface area and low catalyst activity, which directly affects the catalytic performance of the catalyst, which is not conducive to improving the production efficiency and product quality of acrylonitrile.
In addition, in the production process of forming granular molybdenum trioxide with a binder, since the molybdenum trioxide will be seriously sublimated when it is higher than 795 ° C, the heating of the material after granulation cannot be selected at too high a temperature. It also affects the production efficiency of the catalyst itself

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 100 kilograms of ammonium molybdate and 4 kilograms of potassium molybdate, and put them into the barrel of the ball mill for ball milling, so that they are fully mixed and crushed; the ball mill is a drum-type ball mill, and the ball milling time is 4 hours; Mix the ingredients.

[0031] Put the above-mentioned mixed grinding raw materials into a vibrating sieving machine. The sieve mesh diameter of the sieving machine is 100 microns. The sieved coarse material that does not pass the sieve is sent back to the ball mill for ball milling, and the sieved fine material that passes the sieve is sent to the The reduction furnace performs the reduction reaction.

[0032] The reduction furnace adopts a tube-type reduction furnace, the furnace tube speed is 2 rpm, the inlet at one end of the furnace tube is higher than the furnace tube outlet, and the inclination angle of the furnace tube is 5°. The reduced material advances spirally from the high end to the low end with th...

Embodiment 2

[0038] Take 100 kilograms of ammonium molybdate and 3 kilograms of potassium molybdate, and put them into the barrel of the ball mill for ball milling, so that they are fully mixed and crushed; the ball mill is a drum-type ball mill, and the ball milling time is 3 hours; Mix the ingredients.

[0039] Put the above-mentioned mixed grinding raw materials into the vibrating sieving machine. The sieve mesh diameter of the sieving machine is 80 microns, and the sieved coarse material that does not pass the sieve is sent back to the ball mill for ball milling, and the sieved fine material that passes the sieve is sent to the The reduction furnace performs the reduction reaction.

[0040] The reduction furnace adopts a tube-type reduction furnace, the furnace tube speed is 2 revolutions per minute, the feed inlet at one end of the furnace tube is higher than the furnace tube discharge port, and the inclination angle of the furnace tube is 4°. The reduced material advances spirally f...

Embodiment 3

[0045] Take 100 kilograms of ammonium molybdate and 5 kilograms of potassium molybdate, and put them into the barrel of the ball mill for ball milling, so that they are fully mixed and crushed; the ball mill is a drum-type ball mill, and the ball milling time is 3.5 hours; Mix the ingredients.

[0046] Put the above-mentioned mixed grinding raw materials into the vibrating sieving machine. The sieve mesh diameter of the sieving machine is 120 microns. The sieved coarse material that does not pass the sieve is sent back to the ball mill for ball milling, and the sieved fine material that passes the sieve is sent to the The reduction furnace performs the reduction reaction.

[0047] The reduction furnace adopts a tube-type reduction furnace, the furnace tube speed is 2 rpm, the inlet at one end of the furnace tube is higher than the furnace tube outlet, and the inclination angle of the furnace tube is 5°. The reduced material advances spirally from the high end to the low end w...

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Abstract

The invention discloses a preparation method of refined granular molybdenum trioxide, which comprises the following steps: (1) mixing and grinding raw materials, wherein the mixing mass ratio of ammonium molybdate to potassium molybdate is 100: (3 / 5); (2) screening raw materials, wherein the aperture of the screening screen is 80-120 microns; (3) preparation of granular molybdenum powder: reducingto obtain granular molybdenum powder; the preheating zone temperature of the reduction furnace is 300 DEG C to 350 DEG C, the decomposition zone temperature is 380 DEG C to 420 DEG C, the primary reaction zone temperature is 420 DEG C to 440 DEG C, the transition zone temperature is 500 DEG C to 800 DEG C, the secondary reaction zone temperature is 1000 DEG C to 1100 DEG C, and the cooling zone temperature is 600 DEG C to 800 DEG C; (4) primary oxidation of molybdenum powder; (5) molybdenum powder oxidation: the preheating zone temperature of the calcining furnace is 300 DEG C to 400 DEG C, the reaction zone temperature is 600 DEG C to 650 DEG C, and the cooling zone temperature is 300 DEG C to 500 DEG C; (6) cooling and screening; and (7) inspecting and packaging. The prepared granular molybdenum trioxide particles have high strength, large specific surface area and good catalytic performance.

Description

technical field [0001] The invention relates to a method for preparing molybdenum trioxide, in particular to a catalyst used in the production process of acrylonitrile, in particular to a method for preparing molybdenum trioxide in the catalyst. Background technique [0002] Molybdenum is a transition group element, which is widely used in the catalyst industry because of its special properties. Acrylonitrile is an important product of petrochemical industry. In the process of producing acrylonitrile by ammoxidation of propylene, the role of catalyst is very important. In the catalyst composition, molybdenum is the main active component, and the molybdenum exists in the form of molybdate and molybdenum trioxide, and cooperates with other active components to catalyze the oxidation of propylene to acrylonitrile. The acrylonitrile catalyst is usually prepared into particles of a certain shape, and the catalytic reaction process is carried out in a fluidized state in a fluidiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/02B01J23/28C07C253/26C07C255/08
CPCB01J23/28C01G39/02C01P2004/60C01P2004/61C01P2006/12C07C253/26C07C255/08Y02P20/52
Inventor 吴勇本徐志贤
Owner JIANGSU DONGTAI FENGFENG TUNGSTEN & MOLYBDENUM MATERIAL
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