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Method for producing high-purity anhydrous aluminum chloride from aluminum hydroxide

An anhydrous aluminum chloride and aluminum hydroxide technology, applied in the directions of aluminum chloride, aluminum halide, energy input, etc., can solve the problems of complicated operation process, not considering heat removal, reducing equipment capacity, etc., to achieve enhanced transfer and Reaction process, avoid rapid corrosion, reduce the effect of process energy consumption

Active Publication Date: 2020-09-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the patent reports that the chlorination temperature is relatively high, exceeding 750°C, and carbon is attached to the surface of activated alumina by cracking with hydrocarbons, so that the amount of carbon attached to the surface reaches 15-24%, although this method can effectively chlorinate reaction, but the use of diluent in this method reduces the equipment capacity, and the use of gas or liquid carbon sources to attach carbon to the surface of alumina makes the operation process complicated
[0007] In addition, because the anhydrous aluminum chloride is very fine, it is difficult to collect it effectively. The patent US3842163 adopts the method of natural cooling and sedimentation to collect the anhydrous aluminum chloride solid obtained by condensation. However, the efficiency of natural sedimentation is too low, and it is difficult to completely settle , the ultrafine anhydrous aluminum chloride powder still needs to be further collected
During the condensation process of aluminum chloride, it is easy to form a wall, which leads to a decrease in the efficiency of the heat exchanger. After the wall is formed, it is not easy to peel off, making continuous production difficult.
[0008] Comprehensive analysis of the above-mentioned literature and patents shows that the following key common technical problems have not been solved in the prior art: (1) Since the chlorination of alumina is an exothermic reaction, the above-mentioned patents basically do not consider how to remove the released during the reaction. to avoid the problem of rising reaction temperature
Although the patent US3842163 shows that high-purity anhydrous aluminum chloride can be obtained by condensing the chlorination flue gas, in the actual process, the particle size of the alumina powder becomes smaller and smaller as the chlorination reaction proceeds, and a small amount of alumina powder The fine powder will be discharged from the reactor along with the chlorination flue gas, and while the gaseous anhydrous aluminum chloride is condensed into solid anhydrous aluminum chloride, the fine dust will also enter the anhydrous aluminum chloride solid, and it is still difficult to obtain high-purity anhydrous aluminum chloride aluminum chloride

Method used

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  • Method for producing high-purity anhydrous aluminum chloride from aluminum hydroxide

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Embodiment 1

[0048] figure 1 It is a schematic flow chart of the method for producing high-purity anhydrous aluminum chloride from aluminum hydroxide described in the present invention. combine figure 1 , a method for producing high-purity anhydrous aluminum chloride from aluminum hydroxide used in this embodiment, the method includes the following steps: multi-stage cyclone preheating step 1; fluidized decomposition step 2; first cooling Process 3; low-temperature chlorination process 4; second cooling process 5; chlorination flue gas dust collection process 6; condensation collection process 7; sublimation process 8; condensation process 9, specifically as follows:

[0049] 1) Aluminum hydroxide is sent to the multi-stage cyclone preheating process 1, and the hot flue gas obtained by fluidized decomposition is used to preheat the aluminum hydroxide material;

[0050] 2) sending the preheated material obtained in the multi-stage cyclone preheating process 1 into the fluidized decomposit...

Embodiment 2

[0059] The present embodiment adopts the method for producing high-purity anhydrous aluminum chloride by aluminum hydroxide described in embodiment 1. The multi-stage cyclone preheating process 1 uses a 3-stage cyclone preheating decomposer, and the preheated raw materials enter the fluidized decomposition process 2, and use a bubbling fluidized bed decomposer to completely decompose into a high-temperature decomposer at 350°C. Alumina powder; vertical baffles are set inside the fluidized bed, and the residence time is 0.1min. The high-temperature alumina powder obtained by decomposition enters the first cooling process 3 and is cooled to 250°C. The low-temperature alumina powder obtained after cooling enters Low-temperature chlorination step 4, chlorine gas and carbon monoxide are passed into the fluidized bed reactor at a molar ratio of 1:0.9 to cause chlorination of alumina at 600°C; part of the unreacted material is cooled to 50°C through the second cooling step 5 After th...

Embodiment 3

[0061] The present embodiment adopts the method for producing high-purity anhydrous aluminum chloride by aluminum hydroxide described in embodiment 1. The multi-stage cyclone preheating process 1 uses a 4-stage cyclone preheating decomposer, and the preheated raw materials enter the fluidized decomposition process 2, and use a bubbling fluidized bed decomposer to completely decompose into high temperature Alumina powder; vertical baffles are set inside the fluidized bed, and the residence time is 20 minutes. The high-temperature alumina powder obtained by decomposition enters the first cooling process 3 and is cooled to 280°C. After cooling, the low-temperature alumina powder obtained enters the low-temperature Chlorination process 4, chlorine gas, carbon monoxide and nitrogen gas are passed into the fluidized bed reactor at a molar ratio of 1:2:1, so that alumina can undergo chlorination reaction at 700°C; some unreacted materials are cooled by the second cooling process 5 Af...

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Abstract

The invention discloses a method for producing high-purity anhydrous aluminum chloride from aluminum hydroxide. The method comprises the following procedures: (1) a multistage cyclone preheating procedure; a fluidization decomposition step (2); a first cooling step (3); a low-temperature chlorination step (4); a second cooling step (5); a chlorinated flue gas dust collection process (6); a condensation collection step (7); a sublimation step (8); and a condensation step (9). Through the procedures, a high-purity anhydrous aluminum chloride solid product can be obtained. The method has the advantages of being high in production efficiency, low in cost, high in waste heat utilization rate, suitable for large-scale production and the like.

Description

technical field [0001] The invention relates to the field of inorganic material preparation and chemical industry, in particular to the field of production and preparation of high-purity anhydrous aluminum chloride. Background technique [0002] Anhydrous aluminum trichloride is an important inorganic chemical raw material, mainly used in the manufacture of alkylating agents for detergents, synthetic drugs, synthetic dyes, synthetic rubber, detergents, plastics, spices, etc. At the same time, anhydrous aluminum trichloride is also a very important catalyst, especially widely used as a catalyst for the Friedel-Kraft reaction. In addition, anhydrous aluminum trichloride is expected to be used in the production of metal aluminum. In recent years, anhydrous aluminum chloride has also begun to be used as a raw material for fuel cells, as well as outer insulating film materials for semiconductor and chip manufacturing, and the purity requirements for anhydrous aluminum chloride a...

Claims

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Application Information

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IPC IPC(8): C01F7/60C01F7/62
CPCC01F7/60C01F7/62Y02P20/129
Inventor 朱庆山范川林潘锋杨海涛葛宇马素刚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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