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Device for drying lithium iodide and preparing method of lithium iodide

A lithium iodide and drying technology, applied in lithium halide, heating device, drying solid materials and other directions, can solve the problems of large organic reagents, difficult operation, cost, etc., to reduce the content of free iodine, the preparation process is convenient and fast, cost reduction effect

Inactive Publication Date: 2019-09-13
新疆骏强科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method for preparing anhydrous lithium iodide mainly includes the organic solvent method, which is to dissolve lithium iodide with crystal water in an organic solvent several times that of lithium iodide, and use water and organic solvent to form azeotropic compounds. The principle is that when the organic solvent is evaporated, the moisture of lithium iodide is taken out. The biggest disadvantage of this method is that it consumes a large amount of organic reagents, which is costly and not environmentally friendly.
The two-stage pump pumping high vacuum method is based on the rotary vane vacuum pump, plus an oil diffusion pump or a molecular pump. The equipment is complex and cannot achieve industrialized large-scale production.
There is also hydrogen iodide atmosphere protection method. The disadvantage of this method is that it is difficult to operate and pollutes the environment.

Method used

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  • Device for drying lithium iodide and preparing method of lithium iodide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, a device for drying anhydrous lithium iodide in this embodiment includes a heating mantle 1, a flask 2, a vacuum pump 4, an argon gas bottle 7 and a vacuum pressure gauge 5, and the flask 2 is arranged inside the heating mantle 1 , the flask 2 is a three-necked flask, and the three ports are respectively the first interface 21, the second interface 22 and the third interface 23, and the first interface 21, the second interface 22 and the third interface 23 pass through the pipe respectively. Road and argon cylinder 7, vacuum pressure gauge 5 and vacuum pump 4 sealing connection.

[0032] In a further solution, the second interface 22 is also connected with a device 6 for measuring the internal temperature of the flask. The first port 21 and the third port 23 are respectively connected with joints for controlling the connection or disconnection of the flask 2 with the argon bottle 7 and the vacuum pump 4 . The joint is a quick joint 3, one si...

Embodiment 2

[0035] Present embodiment is a kind of method utilizing the device of embodiment 1 to prepare anhydrous lithium iodide, comprises the steps:

[0036] (1) Put 500g of lithium iodide trihydrate in a 5000ml three-neck flask, connect the devices according to the above-mentioned device, vacuumize the flask for 8 minutes, and slowly raise the temperature to 78°C through the electric heating mantle for 2.5 hours while evacuating the vacuum, and then dry it for 2.5 hours. The rate is controlled at 0.5°C / min, and argon is passed every 30 minutes during the drying process;

[0037] (2) Continue to dry in vacuum, then raise the temperature to 240°C and then dry for 10 hours. The heating rate is controlled at 0.5°C / min. During the drying process, the argon gas is passed every 30 minutes, the electric heating mantle is turned off, the heating is stopped, and the vacuum is continued. Wait for the flask to cool down to room temperature naturally, inject argon, close the spring valve on the f...

Embodiment 3

[0039] Present embodiment is a kind of method utilizing the device of embodiment 1 to prepare anhydrous lithium iodide, comprises the steps:

[0040] (1) Put 500g of lithium iodide trihydrate in a 5000ml three-necked flask, connect the devices according to the described device, vacuumize the flask for 10min, and slowly raise the temperature to 80°C through the electric heating mantle to dry for 2h while pumping the vacuum, the heating rate Control at 0.5°C / min, pass argon every 30 minutes during the drying process;

[0041] (2) Continue vacuum drying, then raise the temperature to 250°C and then dry for 8 hours. The heating rate is controlled at 0.5°C / min. During the drying process, the argon gas is passed every 30 minutes, the electric heating mantle is turned off, the heating is stopped, and the vacuum is continued. Wait for the flask to cool down to room temperature naturally, inject argon, close the spring valve on the flask, remove the flask, move it into a glove box, and...

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Abstract

The invention relates to a device for drying lithium iodide and a preparing method of the lithium iodide. The device comprises an electric jacket, a flask, a vacuum pump, an argon bottle and a vacuumpressure meter. The flask is arranged in the electric jacket, the flask is a three-connector flask, three connectors comprise the first connector, the second connector and the third connector, and thefirst connector, the second connector and the third connector are in seal connection with the argon bottle, the vacuum pressure meter and the vacuum pump through pipelines. The three-connector roundbottom glass flask is selected as the flask, trihydrate lithium iodide is subjected to vacuum drying in the flask, cost is reduced, rapid joints are arranged between the flask and the vacuum pump andbetween the flask and the argon bottle, the preparing process is more convenient and rapid, the lithium iodide prepared through the method effectively reduces the content of free iodine, and the waterand the free iodine reach the quality need, and are both lower than 0.02%.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a device for drying anhydrous lithium iodide and a preparation method for anhydrous lithium iodide. Background technique [0002] Anhydrous lithium iodide is a fuel cell additive, fuel cell is one of the most promising automotive power batteries, it is also the electrolyte of lithium-iron sulfide battery, lithium-iron sulfide battery is a new type of high-energy lithium battery, The lithium-iron sulfide battery with lithium iodide as the electrolyte has a capacity 8 times higher than that of ordinary alkaline manganese batteries, and its weight is only half of the same type of alkaline manganese battery, and its voltage is 1.5 volts, which can directly replace zinc manganese battery. It can be said that lithium-iron sulfide battery is the most promising battery. Lithium iodide single crystal is the most suitable crystal for slow neutron detectors. Lithium ...

Claims

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Application Information

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IPC IPC(8): F26B11/00F26B5/04F26B23/06F26B25/00C01D15/04
CPCC01D15/04C01P2006/82F26B5/04F26B11/00F26B23/06F26B25/00
Inventor 杨风春
Owner 新疆骏强科技发展有限公司
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