Method and system for large-scale production of anhydrous magnesium chloride

An anhydrous magnesium chloride, large-scale technology, applied in magnesium chloride, chemical instruments and methods, magnesium halide and other directions, can solve the problems of high demand for ammonia, organic solvents, large consumption of ammonia, equipment corrosion materials, etc., and reach the limit of raw material selection less, the effect of process continuity

Active Publication Date: 2021-10-08
QINGHAI SALT LAKE IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are low reaction conversion, high energy consumption, and large consumption of ammonia.
Existing patents US2381995, US3352634 and CN1 135743A disclose the use of organic solvents as the medium and the use of ammonia to prepare anhydrous magnesium chloride: hydrated magnesium chloride is dissolved in ethylene glycol to obtain magnesium chloride ethylene glycol solution, and anhydrous magnesium chloride is obtained by vacuum distillation Ethylene glycol solution, ammoniated to form MgCl 2 6NH 3 Precipitation, then washing, deamination to produce anhydrous magnesium chloride, but due to the high boiling point alcohol MgCl 2 6NH 3 High solubility leads to MgCl 2 6NH 3 Low precipitation rate and high demand for ammonia and organic solvents
[0006] The above-mentioned ammonia method to prepare anhydrous magnesium chloride utilizes the combination of ammonia and magnesium chloride. Whether water is used as a medium or an organic solvent is used as a medium, it is easy to cause corrosion to equipment and cause material bonding.

Method used

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  • Method and system for large-scale production of anhydrous magnesium chloride
  • Method and system for large-scale production of anhydrous magnesium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Take 5 parts of MgCl 2 ·6H 2 O, each portion of 1000g, use a crusher to crush into granules, throw the crushed materials from the top of the dehydrator, make the granular materials fall from the top, and pass hot air into the bottom of the dehydrator to dehydrate them respectively The temperature in the container is kept at 170°C, 180°C, 200°C, 230°C, 240°C to obtain samples 1-6, and detect the molar ratio of chlorine to magnesium, and the molar ratio of hydrogen to magnesium in samples 1-6. ratio, as shown in Table 1.

[0066] Table 1.

[0067] sample 1 sample 2 sample 3 Sample 4 Sample 5 Chloride to magnesium ratio 1.928 1.833 1.563 1.247 1.090 Hydrogen to Magnesium Ratio 6.071 3.557 2.501 1.765 1.272

[0068] From the hydrogen-magnesium ratio and the chlorine-magnesium ratio, sample 1 contains a large amount of magnesium chloride trihydrate or tetrahydrate, most of samples 2 to 4 are magnesium chloride dihydrate and basi...

Embodiment 2

[0071] Take sample 3 and divide it into four parts. After co-condensing with ammonia and hydrogen chloride under the same conditions, they are transported to their respective reactors. In each reactor, the corresponding temperatures are respectively set to 350°C, 450°C, and 550°C. , 700°C, feed hydrogen chloride and ammonia gas so that the volume percentage of hydrogen chloride gas in the reactor is greater than 5%, and the mole of ammonia gas and hydrogen chloride gas in the reactor is 1.1, so that the gas atmosphere in the reactor is slightly alkaline , reacted for 3h, and after the reaction was completed, anhydrous magnesium chloride with a purity of 96.2%, 97.1%, 98.5% and 99.3% was obtained respectively through detection.

[0072] In the present invention, the ammonium chloride mixed with basic magnesium chloride is decomposed to increase the contact probability of hydrogen chloride and basic magnesium chloride, thereby promoting the reaction of the two, and obtaining rela...

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Abstract

The invention relates to a method and system for large-scale production of anhydrous magnesium chloride, and the method comprises the following steps: 1, dehydrating MgCl2.NH2O particles at 180-230 DEG C to obtain a first material and a first tail gas, wherein n is 0.5-6; 2, mixing the first material with ammonia gas and hydrogen chloride, and conducting condensing at 150-200 DEG C to obtain a second material and second tail gas; and 3, heating the second material at 350-700 DEG C to obtain anhydrous magnesium chloride and third tail gas. According to the method, most of water is removed firstly, so that hardening during high-temperature removal is avoided; the limitation on raw material selection is less, and the process has continuity and is suitable for large-scale production; ammonium chloride is mixed into the first material in a condensation manner, so that the ammonium chloride can be uniformly mixed; and a weak alkaline environment is kept, so that equipment is prevented from being corroded, and recycling is facilitated.

Description

technical field [0001] The invention relates to the technical field of production of anhydrous magnesium chloride, in particular to a method and system for large-scale production of anhydrous magnesium chloride. Background technique [0002] At present, the preparation method of anhydrous magnesium chloride is more, mainly comprises, [0003] Magnesium oxide chlorination to prepare anhydrous magnesium chloride method (IG Farben method): The agglomeration of magnesium oxide and reducing agent carbon is reacted with chlorine gas in an electrically heated shaft furnace (about 800 ° C) to prepare molten anhydrous magnesium chloride, and its disadvantage is that the production Low efficiency, low utilization rate of chlorine gas and large investment in tail gas treatment, and there are chlorinated hydrocarbons in the exhaust gas. [0004] Hydrated magnesium chloride is heated and dehydrated under a hydrogen chloride atmosphere to prepare anhydrous magnesium chloride Method: This...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/30C01C1/16C01C1/02
CPCC01F5/30C01C1/164C01C1/026Y02P20/50
Inventor 李生廷张勇马珍包庆山谢建明王金晶韩永富文生财李国栋李鹏业张发莲张延芳李缉鹏
Owner QINGHAI SALT LAKE IND
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