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Preparation method of anhydrous magnesium chloride

A technology of anhydrous magnesium chloride and magnesium chloride, which is applied in the direction of magnesium chloride and magnesium halide, can solve the problems of difficulty in dehydration of low-hydrate magnesium chloride, difficulty in improving the purity of the final product, and easy corrosion of equipment, so as to achieve easy industrialization, low price, and low energy consumption. consumption effect

Active Publication Date: 2015-04-29
CHINA TIANCHEN ENG +1
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  • Abstract
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Problems solved by technology

[0016] The technical problem solved by the present invention is to overcome the difficulty in dehydration of the intermediate product low-hydration magnesium chloride, easy hydrolysis, difficulty in improving the purity of the final product, energy consumption, high cost, and easy corrosion of equipment when anhydrous magnesium chloride is prepared with magnesium chloride high-hydrate compounds in the prior art. The disadvantage is to provide a preparation method with low cost, simple process and effective inhibition of hydrolysis reaction in the dehydration process to improve the purity of anhydrous magnesium chloride

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  • Preparation method of anhydrous magnesium chloride

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[0035] seefigure 1 , figure 1 The process flow chart of the preparation method of the anhydrous magnesium chloride that the embodiment of the present invention provides, from figure 1 Visible in, the preparation method of anhydrous magnesium chloride comprises the steps:

[0036] 1) The magnesium chloride high hydrate is dehydrated by physical temperature rise to obtain the magnesium chloride low hydrate MgCl 2 ·xH 2 O;

[0037] Specifically, under the protection of HCl gas flow, the magnesium chloride high hydrate is slowly heated in a fluidized bed, and part of the water is initially removed to form a low hydrate MgCl 2 ·xH 2 O;

[0038] Preferably, magnesium chloride high hydrate is MgCl 2 ·6H 2 O, it can be understood that the magnesium chloride high hydrate of the present invention is MgCl 2 ·6H 2 O;

[0039] Wherein, in the obtained low hydrate MgCl2 xH2O, the numerical range of x is 0.5<x<2.5;

[0040] Wherein, the temperature of physical heating and dehydrat...

Embodiment 1

[0056] Under the protection of HCl gas flow, the magnesium chloride high hydrate is slowly heated to 100°C in a fluidized bed, and part of the water is initially removed to form a low hydrate MgCl 2 ·xH 2 O; pass Cl at 55°C 2 with S from subsequent distillation section 2 Cl 2 Mix and react the S 2 Cl 2 into SCl 2 ; Under the condition of 150 ℃, the SCl obtained by the above reaction 2 SO with follow-up segment returns 2 Reaction to synthesize SOCl 2 ; Under the condition of 50°C, the reaction product obtained in the above steps is passed into a rectification tower for rectification, and SOCl is obtained at the bottom of the tower 2 ; Under the condition of 60°C, the obtained SOCl 2 Low water compound MgCl obtained through physical biological dehydration 2 ·xH 2 In O, a chemical reaction occurs to dehydrate to obtain the product high-purity anhydrous MgCl 2 .

Embodiment 2

[0058] Under the protection of HCl gas flow, the magnesium chloride high hydrate is slowly heated to 200°C in a fluidized bed, and part of the water is initially removed to form a low hydrate MgCl 2 ·xH 2 O; pass Cl at 65°C 2 with S from subsequent distillation section 2 Cl 2 Mix and react the S 2 Cl 2 into SCl 2 ; Under the condition of 200 ℃, the SCl obtained by the above reaction 2 SO with follow-up segment returns 2 Reaction to synthesize SOCl 2 ; Under the condition of 100 ° C, the reaction product obtained in the above steps is passed into a rectification tower for rectification, and SOCl is obtained at the bottom of the tower 2 ; Under the condition of 80 ℃, the obtained SOCl 2 Low water compound MgCl obtained through physical biological dehydration 2 ·xH 2 In O, a chemical reaction occurs to dehydrate to obtain the product high-purity anhydrous MgCl 2 .

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Abstract

The invention discloses a preparation method of anhydrous magnesium chloride. The method comprises the following steps: firstly, internally dehydrating magnesium chloride high hydrate under the protection of HCl gas, so as to obtain low hydrate, and then removing residual water through chemical reaction, so as to obtain the high-purity anhydrous magnesium chloride. The initial dehydrating temperature is low, so that the fact that the magnesium chloride is not hydrolyzed and the energy consumption is greatly reduced; a dehydrating agent adopted during the dehydrating in the chemical reaction is formed by the reaction of sulfur and chlorine, intermediate components are continuously recycled, the dehydrating in the chemical reaction ensures that the product anhydrous magnesium chloride is completely disengaged with water environment, and produced side reaction products SO2 and HCL are gases, so that the occurrence of hydrolysis reaction is thoroughly avoided. The method is wide in raw material resource and low in price, the whole technical process is good in economic benefit, and the method provided by the invention is high in operability and easy to realize industrialization.

Description

technical field [0001] The invention relates to a preparation method of a magnesium compound, in particular to a preparation method of anhydrous magnesium chloride. Background technique [0002] Magnesium is one of the lightest structural metal materials. It has the advantages of high specific strength and specific stiffness, good damping and machinability, and easy recycling. It is widely used in automobile manufacturing, electronic products, aerospace industry and military fields. The preparation of metal magnesium by electrolysis is a rapidly developing technology at present, and its main raw material is anhydrous magnesium chloride. Magnesium chloride high hydrate has a wide range of sources and is cheap, and anhydrous magnesium chloride obtained by dehydration will be an ideal raw material. Taking magnesium chloride hexahydrate as an example, the dehydration process for preparing anhydrous magnesium chloride is as follows: [0003] MgCl 2 ·6H 2 O=MgCl 2 4H 2 O+2H ...

Claims

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Application Information

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IPC IPC(8): C01F5/34
CPCC01F5/34
Inventor 孙顺平赵兵张猛张进治耿尧辰
Owner CHINA TIANCHEN ENG
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