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A method for preparing anhydrous aluminum chloride by dehydration of aluminum chloride hexahydrate

A technology of aluminum chloride hexahydrate and anhydrous aluminum chloride, which is applied in the direction of aluminum chloride and aluminum halide, can solve the problems of complex process flow, low purity of anhydrous aluminum chloride, and difficult operation, and achieves wide sources, The effect of wide range of process conditions and low production cost

Active Publication Date: 2015-11-18
GUIYANG AL-MG DESIGN & RES INST
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  • Description
  • Claims
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Problems solved by technology

The process has the following disadvantages: one is that the tail gas contains a small amount of chlorine, which needs to be treated and discharged; the other is that the anhydrous aluminum chloride produced is low in purity and needs to be sublimated and refined to obtain high-purity anhydrous aluminum chloride; the third is the process flow complex, difficult to operate

Method used

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  • A method for preparing anhydrous aluminum chloride by dehydration of aluminum chloride hexahydrate

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Effect test

Embodiment 1

[0041] Take 400 grams of aluminum chloride hexahydrate, dry and dehydrate at 150 ° C, the weight after drying is 246 grams, and the weight loss is 154 grams. Aluminum chloride hexahydrate is dried at 150°C, partial hydrolysis occurs, and AlCl in the dried product 3 ·H 2 O accounted for 68.2%.

Embodiment 2

[0043]Dry aluminum chloride hexahydrate at 150°C and store in sealed condition. Take 150 grams of dried aluminum chloride powder and dissolve it in 1000 ml of ethylene glycol solvent, add 35 grams of ammonium chloride at the same time, and adopt the Karl Fischer method to measure the water content of the solution to be 2.45%. Place the prepared solution in a 2000ml three-necked distillation flask, perform intermittent vacuum distillation and dehydration operation for 180min at a vacuum degree of 650mmHg and a temperature of 150°C, and measure the water content of the solution after vacuum distillation and dehydration to be 0.87%. Take out the ethylene glycol solution of 800ml aluminum chloride from the solution after distillation and dehydration and cool it, add 100ml liquid ammonia, then feed ammonia gas, and generate AlCl in the fluidized bed reaction crystallizer 3 ·NH 3 The precipitate was filtered, washed three times with ethylene glycol saturated with liquid ammonia, an...

Embodiment 3

[0045] Take 100 grams of aluminum chloride hexahydrate, without drying, directly dissolve in 1000ml of ethylene glycol, and use the Karl Fischer method to measure the water content of the solution to be 6.8%. The ethanol solution of aluminum chloride of configuration does not go through the step of vacuum distillation dehydration, directly carries out reaction crystallization process (reaction crystallization, filtration, washing and drying process) and example 2 is identical, the AlCl that the result obtains 3 ·NH 3 The crystals are impure, and the analysis shows that AlCl 3 ·NH 3 The content is about 91%.

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Abstract

The invention discloses a method using aluminum chloride hexahydrate dehydration to prepare anhydrous aluminum chloride. The method comprises the steps that (1) aluminum chloride hexahydrate is dried to remove most of crystallization water; (2) dried aluminum chloride is dissolved in alcohol to prepare an alcohol solution of aluminum chloride, and a vacuum distillation method is used to carry out dehydration on the alcohol solution of the aluminum chloride; (3) the aluminum chloride alcohol solution after dehydration reacts with ammonia to form AlCl3.NH3 through crystallization; and (4) washing, filtering and drying are carried out to acquire an AlCl3.NH3 crystal, and heating, decomposition and deamination are carried out on the dried crystal to prepare the anhydrous aluminum chloride. In all processes, ammonia, a detergent and crystallization mother liquor can be recycled. The process has the advantages of available raw material of aluminum chloride hexahydrate, convenient operation, easy mass production, low energy consumption, low product cost and no pollution to the environment. The prepared anhydrous aluminum chloride can be used as a catalyst of organic synthesis and oil cracking and a raw material of metal aluminum production through an electrolytic method.

Description

technical field [0001] The invention relates to a method for preparing inorganic salts, in particular to a method for preparing anhydrous aluminum chloride. technical background [0002] Anhydrous aluminum trichloride is one of the important inorganic chemical products, mainly used in organic synthesis catalysts, petroleum cracking catalysts, and also widely used in synthetic detergents, pesticides, dyes, spices, etc. In addition to the above uses, anhydrous aluminum trichloride is also used to prepare metal aluminum, which is a new industry that only appeared in the late 1970s. According to literature reports, using anhydrous aluminum trichloride to make metal aluminum is more effective than Hall method, which is widely used in the world at present. Aluminum oxide is used as raw material to electrolytically produce metal aluminum. Each ton of aluminum can save about 3000 degrees of power consumption. At the same time, it has an electric furnace. It has the advantages of hi...

Claims

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Application Information

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IPC IPC(8): C01F7/58
Inventor 马家玉
Owner GUIYANG AL-MG DESIGN & RES INST
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