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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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 anh

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  • Preparation method of anhydrous magnesium chloride

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[0035] See figure 1 , figure 1 This is the process flow diagram of the preparation method of anhydrous magnesium chloride provided by the embodiments of the present invention, from figure 1 It can be seen that the preparation method of anhydrous magnesium chloride includes the following steps:

[0036] 1) Perform physical heating and dehydration of magnesium chloride high hydrate to obtain magnesium chloride low hydrate MgC1 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 water compound MgC1 2 ·XH 2 O;

[0038] Preferably, the 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 MgC1 2 ·6H 2 O;

[0039] Among them, in the obtained low-hydrate MgC12·xH2O, the value range of x is 0.5

[0040] Among them, the temperature of physical heating...

Example Embodiment

[0055] Example 1:

[0056] Under the protection of HCl gas flow, the magnesium chloride high hydrate is slowly heated to 100 ℃ in a fluidized bed, and part of the water is initially removed to form a low water compound MgC1 2 ·XH 2 O; pass Cl at 55℃ 2 And S from the subsequent distillation section 2 Cl 2 Mix and make it react will S 2 Cl 2 Convert to SCl 2 ; Under the condition of 150℃, the SCl obtained by the above reaction 2 And SO returned from subsequent sections 2 Reaction Synthesis SOCl 2 ; Under the condition of 50 ℃, the reaction product obtained in the above steps is passed into the rectification tower for rectification, and SOCl is obtained at the bottom of the tower 2 ;Under the condition of 60℃, the obtained SOCl 2 Into the low water compound MgC1 obtained by physical biological dehydration 2 ·XH 2 In O, chemical reaction dehydration takes place to obtain the product high purity anhydrous MgCl 2 .

Example Embodiment

[0057] Example 2:

[0058] Under the protection of HCl gas flow, the magnesium chloride high hydrate is slowly heated to 200 ℃ in a fluidized bed, and part of the water is initially removed to form a low water compound MgC1 2 ·XH 2 O; pass Cl under the condition of 65℃ 2 And S from the subsequent distillation section 2 Cl 2 Mix and make it react will S 2 Cl 2 Convert to SCl 2 ; Under the condition of 200 ℃, the SCl obtained by the above reaction 2 And SO returned from subsequent sections 2 Reaction Synthesis SOCl 2 ; Under the condition of 100 ℃, the reaction product obtained in the above steps is passed into the rectification tower for rectification, the bottom of the tower is SOCl 2 ; Under the condition of 80℃, the SOCl obtained will be 2 Into the low water compound MgC1 obtained by physical biological dehydration 2 ·XH 2 In O, chemical reaction dehydration takes place 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 ...

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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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