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Method and device for preparing magnesium hydride

A magnesium hydride and hydrogen technology, applied in the direction of alkali metal/alkaline earth metal/beryllium/magnesium hydride, etc., can solve the problems of coarse grain size, high price, slow hydrogen absorption and desorption kinetics, etc., and achieve simple process and high purity Effect

Active Publication Date: 2012-07-18
浙江镁源动力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commercially available polycrystalline MgH 2 The powder is not only expensive, but also has a large grain size. When used as a hydrogen storage material, the kinetics of hydrogen absorption and desorption is extremely slow; when hydrogen is produced by hydrolysis, Mg(OH) 2 Passive film coated in unreacted MgH 2 surface, resulting in a significant decrease in the hydrolysis reaction rate or the inability to continue the reaction, so it cannot be directly used for hydrogen storage or hydrogen production by hydrolysis

Method used

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  • Method and device for preparing magnesium hydride
  • Method and device for preparing magnesium hydride
  • Method and device for preparing magnesium hydride

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preparation example Construction

[0042] The method for preparing magnesium hydride of the present invention generally comprises the following steps:

[0043] a) vacuumize the reaction vessel;

[0044] b) In the vacuum environment of the reaction vessel, the magnesium block is heated and evaporated into magnesium vapor, and part of the magnesium vapor is condensed into magnesium powder on the upper part of the reaction vessel;

[0045] c) charging hydrogen into the reaction vessel;

[0046] d) heating, and insulation, allowing magnesium powder, magnesium vapor and hydrogen to react;

[0047] e) cooling, allowing the magnesium hydride generated to be deposited on the inner wall of the reaction vessel;

[0048] f) Passivation, collecting and obtaining magnesium hydride.

[0049] In step a), the reaction vessel is evacuated to 10 -3 -10 -2 Pa. In step b), the magnesium block is heated to 650-750° C. to evaporate into magnesium vapor. In step c), hydrogen is charged until the pressure is 5-8 MPa. In step d...

Embodiment 1

[0063] 1) Open the lid of the reaction kettle 1 and the plug-in valve 2, put the pure Mg block into a ceramic crucible (caliber slightly smaller than the first heating coil 3), and then place it in the first heating coil 3 of the lower part 11 of the reaction kettle 1;

[0064] 2) Close the lid, the air inlet 121, the air inlet and outlet and the air outlet 122 of the reactor 1, and seal the reactor 1;

[0065] 3) Open vacuum pump 5 and air outlet 122, vacuumize to 10 -2 Pa, then close the vacuum pump 5 and the air outlet 122;

[0066] 4) Turn on the first control power supply 8, the first heating coil 3 works, heat to 650°C to evaporate the Mg block, and the Mg vapor will deposit on the inner wall of the reaction kettle when it is cooled to 650°C. The time is 5 hours;

[0067] 5) Close the plugboard valve 2 and the first control power supply 8, charge H 2 to 6MPa;

[0068] 6) Turn on the second control power supply 9, the second heating coil works, heat to 350°C and then ...

Embodiment 2

[0073] 1) Open the lid of the reaction kettle 1 and the plug-in valve 2, put the pure Mg block into a ceramic crucible (caliber slightly smaller than the first heating coil 3), and then place it in the first heating coil 3 of the lower part 11 of the reaction kettle 1;

[0074] 2) Close the lid, the air inlet 121, the air inlet and outlet and the air outlet 122 of the reactor 1, and seal the reactor 1;

[0075] 3) Open vacuum pump 5 and air outlet 122, vacuumize to 10 -2 Pa, then close the vacuum pump 5 and the air outlet 122;

[0076] 4) Turn on the first control power supply 8, the first heating coil 3 works, heat to 700°C to evaporate the Mg block, and the Mg vapor reaches the upper part 12 of the reactor 1 and deposits on the inner wall of the reactor when it cools, and heats to 700°C The time taken is 5 hours;

[0077] 5) Close the plugboard valve 2 and the first control power supply 8, charge H 2 to 8MPa;

[0078] 6) Turn on the second control power supply 9, the sec...

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Abstract

The invention relates to a method for preparing magnesium hydride and also relates to a device for preparing the magnesium hydride. The device for preparing the magnesium hydride comprises a reaction kettle, an inserted plate valve, a first heating coil, a second heating coil, a first gas inlet, a gas inlet and outlet port and a gas outlet, wherein the inserted plate valve is arranged in the reaction kettle and is positioned at the middle part of the reaction kettle to divide the reaction kettle into an upper part and a lower part; the first heating coil is arranged at the lower part of the reaction kettle; the second heating coil is arranged at the upper part of the reaction kettle; the first gas inlet is arranged on the side wall of the upper part of the reaction kettle; the gas inlet and outlet port is arranged on the side wall of the upper part of the reaction kettle; and the gas outlet is arranged on the side wall of the upper part of the reaction kettle. In the method for preparing the magnesium hydride, the device for preparing the magnesium hydride is adopted. The device disclosed by the invention solves the technical problem that a high temperature and a high hydrogen pressure are required for preparing the magnesium hydride currently.

Description

technical field [0001] The invention relates to a method for preparing magnesium hydride, and also relates to a device for preparing magnesium hydride. Background technique [0002] Magnesium hydride (MgH 2 ), also known as magnesium dihydride, is an inorganic salt, the appearance is off-white powder, the crystal structure is a tetragonal system, and the density is 1.45g / cm 3 . [0003] MgH 2 It is a covalent hydride, and its enthalpy of formation is -74.5kJ / mol. It has high stability at normal temperature and pressure, and the hydrogen absorption and desorption temperature is generally as high as 623-673K. MgH 2 Under vacuum, it decomposes at 280°C. MgH 2 It is weakly alkaline, insoluble in general organic solvents, flammable and irritating. MgH 2 It cannot be used to replace calcium hydride as a hydrogen source or desiccant, nor can it replace sodium hydride as an alkaline condensing agent in organic reactions, because its alkalinity is too weak, but it can form po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B6/04
Inventor 邹建新郭皓曾小勤丁文江
Owner 浙江镁源动力科技有限公司
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